Tomasz Klimczuk - Publikacje - MOST Wiedzy

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Katalog Publikacji

Rok 2017
Rok 2016
Rok 2015
  • A large family of filled skutterudites stabilized by electron count
    Publikacja
    • H. Luo
    • J. Krizan
    • L. Muechler
    • N. Haldolaarachchige
    • T. Klimczuk
    • W. Xie
    • M. Fuccillo
    • C. Felser
    • R. J. Cava

    - Nature Communications - Rok 2015

    The Zintl concept is important in solid-state chemistry to explain how some compounds that combine electropositive and main group elements can be stable at formulas that at their simplest level do not make any sense. The electronegative elements in such compounds form a polyatomic electron-accepting molecule inside the solid, a ‘polyanion’, that fills its available energy states with electrons from the electropositive elements...

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  • Absence of superconductivity in fluorine-doped neptunium pnictide NpFeAsO
    Publikacja
    • A. Walters
    • H. Walker
    • R. Springell
    • M. Krisch
    • A. Bosak
    • A. Hill
    • C. Zvorişte-Walters
    • E. Colineau
    • J. Griveau
    • D. Bouëxière... i 3 innych

    - JOURNAL OF PHYSICS-CONDENSED MATTER - Rok 2015

    X-ray diffraction, specific heat, magnetic susceptibility and inelastic x-ray scattering measurements on the transurarium oxypnictides NpFeAsO and NpFeAsO0.85F0.15 are presented. No superconductivity down to 2 K was observed upon fluorine doping, contrary to the structurally analogous rare-earth pnictides. No modification of the phonon density of states was observed upon doping with fluorine. We discuss our results in light of...

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  • Endohedral gallide cluster superconductors and superconductivity in ReGa5
    Publikacja
    • W. Xie
    • H. Luo
    • B. Phelan
    • T. Klimczuk
    • F. Cevallos
    • R. J. Cava

    - PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA - Rok 2015

    We present transition metal-embedded (T@Gan) endohedral Ga clusters as a favorable structural motif for superconductivity and develop empirical, molecule-based, electron counting rules that govern the hierarchical architectures that the clusters assume in binary phases. Among the binary T@Gan endohedral cluster systems, Mo8Ga41, Mo6Ga31, Rh2Ga9, and Ir2 Ga9 are all previously known superconductors. The well-known exotic superconductor...

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  • Ferro- and antiferro-magnetism in (Np, Pu)BC
    Publikacja

    - APL Materials - Rok 2015

    Two new transuranium metal boron carbides, NpBC and PuBC, have been synthesized. Rietveld refinements of powder XRD patterns of {Np,Pu} BC confirmed in both cases isotypism with the structure type of UBC. Temperature dependent magnetic susceptibility data reveal antiferromagnetic ordering for PuBC below T-N = 44 K, whereas ferromagnetic ordering was found for NpBC below T-C = 61 K. Heat capacity measurements prove the bulk character...

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  • KTaO3-based nanocomposites for air treatment

    A series of single semiconductors and their nanocomposites combination (such as KTaO3 + CdSe + SrTiO3; KTaO3 + CdS +WO3; KTaO3 + CdS + MoS2) were prepared using hydrothermal route. Photocatalytic activity of as-prepared nanocomposites was estimated by photocatalytic degradation of toluene in the gas phase using light-emitting diodes (LEDs, 375 nm) in four subsequent cycles. The nanocomposites were characterized by scanning electron...

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  • Microstructure and electrical properties of manganese borosilicate glasses

    The structure, optical and electrical properties of manganese borosilicate glasses of the composition xMnO–(80 − x)SiO 2 –20B 2 O 3 (x = 40, 50, and 60 mol%) were investigated. The dependence of the glass structure on its composition was discussed and related to electrical properties. A separation of two amorphous phases was observed. It was suggested that one phase is MnO-rich and the other is SiO 2 -rich. It was found that...

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  • Perovskite-type KTaO3–reduced graphene oxide hybrid with improved visible light photocatalytic activity
    Publikacja

    - RSC Advances - Rok 2015

    Novel rGO–KTaO3 composites with various graphene content were successfully synthesized using a facile solvothermal method which allowed both the reduction of graphene oxide and loading of KTaO3 nanocubes on the graphene sheets. The as-prepared photocatalysts were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning electron microscopy (SEM) with energy dispersive X-ray analysis (EDX), Fourier...

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  • Pressure effects on the superconductivity of the HfPd2Al Heusler compound: Experimental and theoretical study
    Publikacja

    - PHYSICAL REVIEW B - Rok 2015

    Polycrystalline 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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  • Superconductivity in the niobium-rich compound Nb5Se4
    Publikacja

    - JOURNAL OF ALLOYS AND COMPOUNDS - Rok 2015

    The niobium rich selenide compound Nb5Se4 was synthesized at ambient pressure by high-temperature solid–state reaction in a sealed Ta tube. Resistivity and heat capacity measurements reveal that this compound is superconducting, with a Tc = 1.85K. The electronic contribution to the specific heat γ and the Debye temperature are found to be 18.1 mJmol−1K−2 and 298 K respectively. The calculated electron-phonon coupling constant λep...

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  • Unusual behaviour of (Np,Pu)B2C
    Publikacja
    • T. Klimczuk
    • P. Boulet
    • J. Griveau
    • E. Colineau
    • E. Bauer
    • M. Falmbigl
    • P. Rogl
    • F. Wastin

    - PHILOSOPHICAL MAGAZINE - Rok 2015

    Two transuranium metal boron carbides, NpB2C and PuB2C have been synthesized by argon arc melting. The crystal structures of the {Np,Pu}B2C compounds were determined from single-crystal X-ray data to be isotypic with the ThB2C-type (space group R3m, a = 0.6532(2) nm; c = 1.0769(3) nm for NpB2C and a = 0.6509(2) nm; c = 1.0818(3) nm for PuB2C; Z = 9). Physical properties have been derived from polycrystalline bulk material in the...

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Rok 2014
  • 237Np Mössbauer effect study on NpFeAsO
    Publikacja
    • P. Gaczyński
    • T. Klimczuk
    • H. Walker
    • R. Springell
    • E. Colineau
    • R. Eloirdi
    • J. Griveau
    • R. Caciuffo

    - JOURNAL OF PHYSICS-CONDENSED MATTER - Rok 2014

    We report 237Np Mössbauer measurements on NpFeAsO. The Np atoms were found to occupy only one crystallographic site. The value of the isomer shift (δ ∼ 9.1 mm s−1 versus NpAl2) indicates a 5f4 electronic configuration (Np3+ ions). The magnetic ordering of the Np sublattice below 60 K is established and the saturated ordered magnetic moment is determined to be 1.73μB at 3.6 K. The unique set of hyperfine parameters exclude a modulated...

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  • Crystal structure and electronic structure of CePt2In7
    Publikacja
    • T. Klimczuk
    • O. Walter
    • L. Müchler
    • J. W. Krizan
    • F. Kinnart
    • R. J. Cava

    - JOURNAL OF PHYSICS-CONDENSED MATTER - Rok 2014

    We report a corrected crystal structure for the CePt2In7 superconductor, refined from single crystal x-ray diffraction data. The corrected crystal structure shows a different Pt–In stacking along the c-direction in this layered material than was previously reported. In addition, all of the atomic sites are fully occupied with no evidence of atom site mixing, resolving a discrepancy between the observed high resistivity ratio of...

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  • Evidence for SrHo2O4 and SrDy2O4 as model J1- J2 zigzag chain materials
    Publikacja
    • A. Fennell
    • V. Y. Pomjakushin
    • A. Uldry
    • B. Delley
    • B. Prévost
    • A. Désilets-Benoit
    • A. D. Bianchi
    • R. I. Bewley
    • B. R. Hansen
    • T. Klimczuk... i 2 innych

    - PHYSICAL REVIEW B - Rok 2014

    Neutron diffraction and inelastic spectroscopy is used to characterize the magnetic Hamiltonian of SrHo2O4 and SrDy2O4. Through a detailed computation of the crystal-field levels we find site-dependent anisotropic single-ion magnetism in both materials, and diffraction measurements show the presence of strong one-dimensional spin correlations.Our measurements indicate that competing interactions of the zigzag chain, combinedwith...

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  • KTaO3-based nanocomposites for air treatment

    The advantage is that photocatalytic methods allow removing VOCs, NOx, SO2, deodorants, and microorganisms at the same system. The new third generation of photoactive materials activated by low powered and low cost irradiation sources (such as LEDs or black fluorescent UV lamps) can be used as photocatalysts in air purification systems. A series of single semiconductors and their nanocomposites combination were prepared using hydrothermal...

  • Noncentrosymmetric superconductor with a bulk three-dimensional Dirac cone gapped by strong spin-orbit coupling
    Publikacja

    - PHYSICAL REVIEW B - Rok 2014

    The layered, noncentrosymmetric heavy element PbTaSe2 is found to be superconducting. We report its electronic properties accompanied by electronic-structure calculations. Specific heat, electrical resistivity, and magnetic-susceptibility measurements indicate that PbTaSe2 is a moderately coupled, type-IIBCSsuperconductor (Tc = 3.72 K, Ginzburg–Landau parameter κ = 17) with an electron-phonon coupling constant of λep = 0.74. Electronic-structure...

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  • Superconducting properties and electronic structure of NaBi
    Publikacja
    • S. K. Kushwaha
    • J. W. Krizan
    • J. Xiong
    • T. Klimczuk
    • Q. D. Gibson
    • T. Liang
    • N. Ong
    • R. J. Cava

    - JOURNAL OF PHYSICS-CONDENSED MATTER - Rok 2014

    Resistivity, dc magnetization, and heat capacity measurements are reported for superconducting NaBi. Tc, the electronic contribution to the specific heat γ, the ΔCp/γTc ratio, and the Debye temperature are found to be 2.15 K, 3.4 mJ mol−1 K−2, 0.78, and 140 K respectively. The calculated electron–phonon coupling constant (λep = 0.62) implies that NaBi is a moderately coupled superconductor. The upper critical field and coherence...

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