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Search results for: superconductivity
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Conductivity and superconductivity of (Bi,Pb)4Sr3Ca3Cu4Ox glass-ceramics.
PublicationW układzie(Bi,Pb)-Sr-Ca-Cu-O poprzez krystalizację w fazie stałej można wytworzyć materiały o bardzo różnych właściwościach elektrycznych i nadprzewodzących. W zależności od warunków krystalizacji, można wytworzyć nadprzewodnik o temperaturze krytycznej między 8 a 105 st.K lub materiał nie przechodzący do stanu nadprzewodzącego. W pracy pokazano i przedyskutowano wpływ składu fazowego, struktury i mikrostruktury na przewodnictwo...
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Superconductivity phase diagram of Na x CoO2·1.3H2O
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The first order phase transition and superconductivity in BaNi2As2single crystals
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Effect of Ru substitution for Ni on the superconductivity inMgCNi3−xRux
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Superconductivity in the calcium-decorated hexagonal boron nitride monolayer
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Conductivity and superconductivity of (Bi,Pb)4Sr3Ca3Cu4Ox glass-ceramics
PublicationAmorficzny materiał (Bi,Pb)4Sr3Ca3Cu4Ox w zależności od warunków wygrzewania może być albo granulastym materiałem albo silnie nieuporządkowanym metalem. W pracy przedstawiony jest wpływ mikrostruktury na właściwości elektryczne w stanie normalnym oraz przejście do stanu nadprzewodzącego.
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Influence of conditions of synthesis on superconductivity in Nd2-xCexCuO4-y
PublicationPróbki Nd1.85Ce0.15CuO4 uzyskano dwoma różnymi metodami syntez. Po procesie redukcji właściwości nadprzewodzące próbek scharakteryzowano za pomocą pomiarów rezystywnych i magnetycznych. W celu przeanalizowania morfologii powierzchni próbek poddano je badaniom mikroskopowym SEM z sondą EDAX.
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Superconductivity–Electron Count Relationship in Heusler Phases─the Case of LiPd2Si
PublicationWe report superconductivity in the full Heusler compound LiPd2Si (space group Fm3̅m, No. 225) at a critical temperature of Tc = 1.3 K and a normalized heat capacity jump at Tc, ΔC/γTc = 1.1. The low-temperature isothermal magnetization curves imply type-I superconductivity, as previously observed in LiPd2Ge. We show, based on density functional theory calculations and using the molecular orbital theory approach, that while LiPd2Si...
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CeIr3: superconductivity in a phase based on tetragonally close packed clusters
PublicationWe present the crystallographic analysis, superconducting and spectroscopic characterization, and theoretical modeling of CeIr3. Lattice parameters a = 5.2945(1) Å and c = 26.219(1) Å are found for the R-3m symmetry crystal structure, which are close to the literature values. CeIr3 is a moderate type-II superconductor (κ GL = 17, λ e–p = 0.65) below 2.5 K. Ce ions exhibit a strongly intermediate valence character as evidenced by...
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Conductivity and superconductivity of (Bi,Pb)–Sr–Ca–Cu–O
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Influence of the improved reduction technique on superconductivity in Nd1.85Ce0.15Cu1±yO4−δ
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Influence of the improved reduction technique on superconductivity in Nd1.85Ce0.15Cu1+_yO4-z
PublicationW pracy opisano zmodyfikowany proces redukcji próbek ceramicznych NCCO oraz jego wpływ na właściwości nadprzewodzące związku. Uzyskano dobre właściwości nadprzewodzące dla próbek z 2% niedoborem Cu oraz bardzo dobre wyniki dla próbek z 2% nadmiarem Cu.
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Conductivity and superconductivity of (Bi,Pb)-Sr-Ca-Cu-O
PublicationAmorficzny materiał (Bi,Pb)4Sr3Ca3Cu4Ox w zależności od warunków wygrzewania może być albo granulastym materiałem albo silnie nieuporządkowanym metalem. Przejście do stanu nadprzewodzącego zachodzi w materiałach, w których Josephsonowskie sprzężenie między granulami jest silniejsze niż oddziaływania Coulombowskie.
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Breakdown of Adiabatic Superconductivity in Ca-Doped h-BN Monolayer
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Superconductivity and particle accelerators 2018: SPAS'2018 conference overview
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The first order phase transition and superconductivity in BaNi2As2 single crystals
PublicationDyskutowane są synteza i właściwości fizyczne monokryształów BaNi2As2. BaNi2As2 krystalizuje w strukturze ThCr2Si2, a stałe sieciowe wynoszą odpowiednio: a = 4.112(4) A i c = 11.54(2) A. Pomiar oporu elektrycznego, zmiennopolowej podatności magnetycznej, ciepła właściwego, pokazują objętościowy efekt nadprzewodzący z Tc = 0.7 K.
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Superconductivity in a breathing kagome metals ROs2 (R = Sc, Y, Lu)
PublicationWe have successfully synthesized three osmium-based hexagonal Laves compounds ROs2 (R = Sc, Y, Lu), and discussed their physical properties. LeBail refinement of pXRD data confirms that all compounds crystallize in the hexagonal centrosymmetric MgZn2- type structure (P63/mmc, No. 194). The refined lattice parameters are a = b = 5.1791(1) Å and c = 8.4841(2) Å for ScOs2, a = b = 5.2571(3) Å and c = 8.6613(2) Å for LuOs2 and a =...
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Pressure effects on the superconductivity of the HfPd2Al Heusler compound: Experimental and theoretical study
PublicationPolycrystalline HfPd2Al has been synthesized using the arc-melting method and studied under ambient-pressure conditions by x-ray diffraction from room temperature up to 450 °C. High-pressure x-ray diffraction up to 23 GPa was also performed using Diacell-type membrane diamond anvil cells. The estimated linear thermal expansion coefficient was found to be α=1.40(3)×10−5K−1, and the bulk modulus derived from the fit to the third-order...
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Study of superconductivity in a wide range of Ce doping in Nd-214 system
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The effect of Ru substitution for Ni on the superconductivity in MgCNi_(3-x)Ru_x
PublicationW pracy prezentowane są pomiary podatności magnetycznej i ciepła właściwego domieszkowanego nadprzewodnika MgCNi_(3-x)Ru_x. Wraz ze wzrostem koncetracji Ru współczynnik Sommerfelda, jak również temperatura krytyczna (T_c) maleją, co stoi w sprzeczności z teoretycznymi oczekiwaniami.
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Effects of Coulomb Interactions Between Fermions on Superconductivity in Boson-Fermion Model
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Strong-coupling superconductivity of SrIr2 and SrRh2 : Phonon engineering of metallic Ir and Rh
PublicationExperimental and theoretical studies on superconductivity in SrIr2 and SrRh2 Laves phases are presented. The measured resistivity, heat capacity, and magnetic susceptibility confirm the superconductivity of these compounds with Tc = 6.07 and 5.41 K, respectively. Electronic structure calculations show that the Fermi surface is mostly contributed by 5d (4d) electrons of Ir (Rh), with Sr atoms playing the role of electron donors....
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Superconductivity in a new intermetallic structure type based on endohedral Ta@Ir7Ge4 clusters
PublicationWe report the observation of superconductivity at a temperature near 3.5 K for the previously unreported compound TaIr2Ge2. In addition to being a superconductor, this material displays a new crystal structure type that contains endohedral clusters, as determined by single-crystal x-ray diffraction structure refinement; the structure is more complex than those of the commonly observed tetragonal 122 intermetallic phases. Despite...
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Unraveling the role of boron dimers in the electrical anisotropy and superconductivity in boron-doped diamond
PublicationWe use quantum mechanics (QM) to determine the states formed by B dopants in diamond. We find that isolated B sites prefer to form BB dimers and that the dimers pair up to form tetramers (BBCBB) that prefer to aggregate parallel to the (111) surface in the <110> direction, one double layer below the H-terminated surface double layer. These tetramers lead to metallic character (Mott metal Insulator Transition) with holes in the...
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Superconductivity in Bismuth Pyrochlore Lattice Compounds RbBi2 and CsBi2: The Role of Relativistic Effects
PublicationSuperconducting properties of two bismuthide intermetallic compounds, RbBi2 and CsBi2, were studied by means of experimental measurements and ab initio calculations. We show that in both compounds, the superconductivity emerges from the pyrochlore Bi lattice and its formation is heavily influenced by relativistic effects. Based on our analysis of the effect of spin–orbit coupling on the electron–phonon coupling, we suggest a possible...
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Superconductivity in PrBa2Cu3O7−δ single crystals after high-temperature thermal treatment
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From Weak to Strong Coupling Superconductivity: Collective Modes in a Model with Local Attraction
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Isotropic s -wave superconductivity in the noncentrosymmetric charge density wave superconductor SrPt2As2
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Rattling-enhanced superconductivity in MV2Al20 (M = Sc, Lu, Y) intermetallic cage compounds
PublicationPolycrystalline samples of four intermetallic compounds: MV2Al20 (M=Sc, Y, La, and Lu) were synthesized using an arc-melting technique. The crystal structures were analyzed by means of powder x-ray diffraction and Rietveld analysis, and the physical properties were studied by means of heat capacity, electrical resistivity, and magnetic susceptibility measurements down to 0.4 K. For ScV2Al20, LuV2Al20, and YV2Al20, superconductivity...
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Crossover from charge density wave stabilized antiferromagnetism to superconductivity in Nd1−xLaxNiC2 compounds
PublicationThe path from the charge density wave antiferromagnet NdNiC2 to the noncentrosymmetric superconductor LaNiC2 is studied by gradual replacement of Nd by La ions. The evolution of physical properties is explored by structural, magnetic, transport, magnetoresistance, and specific heat measurements. With the substitution of La for Nd, the Peierls temperature is gradually suppressed, which falls within the BCS mean-field relation for...
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Importance of Specific Heat Characterization when Reporting New Superconductors: An Example of Superconductivity in LiGa2Rh
PublicationWe show that the full-Heusler compound LiGa2Rh is a superconductor with Tc = 2.4 K. The new superconductor was found as a result of an intuition-based extension of a database search for superconductors that looked for the presence of peaks in the electronic band structure near the Fermi energy. The measurement of the entropy loss during the transition from the nonsuperconducting to the superconducting state, a straightforward measurement...
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Superconductivity of Ta-Hf and Ta-Zr alloys: Potential alloys for use in superconducting devices
PublicationThe electronic properties relevant to superconductivity are reported for bulk Ta-Hf and Ta-Zr body centered cubic alloys, in a large part to determine whether their properties are suitable for potential use in superconducting qbits. The body centered cubic unit cell sizes increase with increasing alloying. The results of magnetic susceptibility, electrical resistivity, and heat capacity characterization are reported. While elemental...
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Retraction: Superconductivity in the Rh-based Heusler familyMRh2Sn[Phys. Rev. B82, 134520 (2010)]
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Superconductivity and Superconducting Materials
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Superconductivity and superconducting compounds
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Pressure effects on the electronic structure and superconductivity of (TaNb)0.67(HfZrTi)0.33 high entropy alloy
PublicationEffects of pressure on the electronic structure, electron-phonon interaction, and superconductivity of the high entropy alloy ( TaNb ) 0.67 ( HfZrTi ) 0.33 are studied in the pressure range 0–100 GPa. The electronic structure is calculated using the Korringa-Kohn-Rostoker method with the coherent potential approximation. Effects of pressure on the lattice dynamics are simulated using the Debye-Grüneisen model and the Grüneisen...
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Structure and superconductivity of VN-SiO2 films obtained by thermal nitridation of sol-gel derived coatings
PublicationPraca prezentuje wyniki badań strukturalnych oraz właściwości nadprzewodzących cienkich warstw xVN-(100-x)SiO2, gdzie x = 90, 80, 70, 60 mol%. Warstwy zostały wykonane metodą termicznego azotowania z użyciem amoniaku cienkich warstw tlenkowych otrzymanych metodą zol-żel. Badania struktury przeprowadzono metodami XRD oraz XPS, natomiast właściwości nadprzewodzące badano metodą MMMA. Właściwości nadprzewodzące warstw zależą zarówno...
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Superconductivity and appearance of negative magnetocaloric effect in Ba1–xKxBiO3 perovskites, doped by Y, La and Pr
PublicationRecently, substantial attention is given to the bismuth-based perovskites for variety of electronic applications. The perovskites are used for quantum dots displays (QLED), photovoltaic systems and superconducting (HTS) devices. In this paper comprehensive studies of Ba1–xKxBi1–yREyO3 bismuth perovskites (REBKBO, RE = Y , La or Pr) are reported. Apart from structural anomalous behavior at low temperatures, the electronic properties...
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Superconductivity in PrBa 2Cu 3O 7− δ single crystals after high-temperature thermal treatment
PublicationThe influence of post-growth treatment, consisting of high-temperature reduction, quench and oxidation, on the structural, electrical and magnetic properties of PrBa2Cu3O7−δ single crystals, obtained in Al2O3 and ZrO2 crucibles by the self-flux method, was examined. We report on the observation of inhomogeneous superconductivity in several Al-doped crystals from the ac magnetic susceptibility and resistivity measurements. Superconducting...
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From weak- to strong-coupling superconductivity in the AlB2-type solid solution SrGa1−xAlxGe with honeycomb layers
PublicationWe report on the structure and the superconducting properties of 9-electron 111 compounds with honeycomb layers, namely SrGaGe, SrAlGe, and the SrGa1−xAlxGe solid solution. By means of single-crystal x-ray diffraction we show that, on one hand, SrGaGe crystallizes into the centrosymmetric P6/mmm space group (a = 4.2555(2) Å, c = 4.7288(2) Å) with statistical disorder in the [GaGe]2− 6 honeycomb layers. On the other hand, we confirm...
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IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
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Time reversal invariant single-gap superconductivity with upper critical field larger than the Pauli limit in NbIr2B2
PublicationRecently, compounds with noncentrosymmetric crystal structure have attracted much attention for providing a rich playground in search for unconventional superconductivity. NbIr2B2 is a new member to this class of materials harboring superconductivity below Tc = 7.3(2) K and a very high upper critical field that exceeds Pauli limit. Here we report on muon spin rotation (μSR) experiments probing the temperature and field dependence...
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Electrical conductivity and superconductivity in (Bi-Pb)-Sr-Ca-Cu-O glassceramics during the first minutes of crystallisation.
Publication(Bi0.8Pb0.2)4Sr3Ca3Cu4Ox częściowo skrystalizowane próbki otrzymano poprzez wygrzewanie szkła w temperaturze między 700st.C i 870st.C przez krótki czas.Pomiary temperaturowej zależności oporności przeprowadzono metodą 4-punktową w temperaturze od 3K do 300K. Przeprowadzono również pomiary przewodności w czasie trwania wygrzewania. Stwierdzono, że w czasie wygrzewania następuje stopniowa zmiana mechanizmu przewodnictwa. Niektóre...
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Synthesis of three layer NaxCoO2 (x=0.3, 0.5, 0.6, 0.75, 1.0) and superconductivity in three layer Na0.3CoO2 * 1.3H2O
PublicationDyskutowana jest synteza trójwarstwowego związku sodowo-kobaltowego tlenku NaxCoO2. Związek o zawartości sodu x=0.3 może zostać uwodniony i staje się nadprzewodnikiem z Tc=4.3K. Powierzchnia 3 warstwowego związku charakteryzuje się trójkątną morfologią, podczas gdy dwuwarstwowy związek Na0.7CoO2 - heksagonalną morfologią.
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Superconductivity and Superconducting Materials - 23/24
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Journal of Superconductivity and Novel Magnetism
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Final state of thermal evolution of Jupiter-type planet
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Electrical Simulations of the SIS100 Superconducting Dipole and Quadrupole Circuits: Transients, Earthing and Failure Modes
PublicationThe 100 Tm superconducting synchrotron SIS100 is the main accelerator of the international Facility for Antiproton and Ion Research (FAIR) currently under advanced construction in Darmstadt, Germany. The SIS100 dipole circuit which creates the magnetic field required to bend the beam, consists of 108 dipoles distributed over six arc sections of the ring. The magnetic field for the beam focusing is generated by three individual...
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Characteristics of Superconducting State in Vanadium: the Eliashberg Equations and Semi-analytical Formulas
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Comparison of Overcurrent Responses of 2G HTS Tapes
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