Michał Jerzy Winiarski - Publikacje - MOST Wiedzy

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2020
2019
  • (CsX)Cu5O2(PO4)2 (X = Cl, Br, I): A Family of Cu2+ S = 1/2 Compounds with Capped-Kagomé Networks Composed of OCu4 Units
    Publikacja

    - INORGANIC CHEMISTRY - 2019

    Three new salt inclusion compounds (CsX)Cu5O2(PO4)2 (X = Cl, Br, I), phosphate analogues of the kagomé mineral averievite, are reported. Their crystal structures are composed of trigonal networks of corner-sharing OCu4 anion-centered tetrahedra, forming capped-kagomé planes, which can also be regarded as two-dimensional slices along the [111] direction of a pyrochlore lattice. Magnetization and heat capacity measurements reveal...

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  • Dirac fermions and possible weak antilocalization in LaCuSb2
    Publikacja
    • J. Chamorro
    • A. Topp
    • Y. Fang
    • M. Winiarski
    • C. Ast
    • M. Krivenkov
    • A. Varykhalov
    • B. Ramshaw
    • L. Schoop
    • T. McQueen

    - APL Materials - 2019

    Layered heavy-metal square-lattice compounds have recently emerged as potential Dirac fermion materials due to bonding within those sublattices. We report quantum transport and spectroscopic data on the layered Sb square-lattice material LaCuSb2. Linearly dispersing band crossings, necessary to generate Dirac fermions, are experimentally observed in the electronic band structure observed using angle-resolved photoemission spectroscopy,...

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  • Iridium 5d -electron driven superconductivity in ThIr3
    Publikacja

    - PHYSICAL REVIEW B - 2019

    A polycrystalline sample of superconducting ThI r 3 was obtained by arc-melting Th and Ir metals. Powder x-ray diffraction revealed that the compound crystalizes in a rhombohedral crystal structure (R-3m, s.g. #166) with the lattice parameters: a = 5.3394 ( 1 ) Å and c = 26.4228 ( 8 ) Å . Normal and superconducting states were studied by magnetic susceptibility, electrical resistivity, and heat capacity measurements. The results...

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  • Low-Dimensional Magnetic Semimetal Cr0.65Al1.35Se3
    Publikacja

    - INORGANIC CHEMISTRY - 2019

    While exploring novel magnetic semiconductors, the new phase Cr0.65Al1.35Se3 was discovered and characterized by both structural and physical properties. Cr0.65Al1.35Se3 was found to crystallize into orthorhombic CrGeTe3-type structure with space group Pnma (no. 62). Vacancies and mixed occupancies were tested, and the results show that one of the 4c sites accommodates a mixture of Cr and Al atoms, while the other 4c site is fully...

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  • New kagome prototype materials: discovery of KV3Sb5, RbV3Sb5, and CsV3Sb5
    Publikacja
    • B. Ortiz
    • L. Gomes
    • J. Morey
    • M. Winiarski
    • M. Bordelon
    • J. Mangum
    • I. Oswald
    • J. Rodriguez-Rivera
    • J. Neilson
    • S. Wilson
    • E. Ertekin
    • T. McQueen
    • E. Toberer

    - Physical Review Materials - 2019

    In this work, we present our discovery and characterization of a new kagome prototype structure, KV3Sb5. We also present the discovery of the isostructural compounds RbV3Sb5 and CsV3Sb5. All materials exhibit a structurally perfect two-dimensional kagome net of vanadium. Density-functional theory calculations indicate that the materials are metallic, with the Fermi level in close proximity to several Dirac points. Powder and single-crystal...

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  • Stabilization of the pyrochlore phase of Mn2Sb2O7 by double substitution
    Publikacja

    Polycrystalline samples of (Ce4+Mn2+3)(Ga3+Sb5+3)O14 were synthesized by a high-temperature solid-state reaction. In contrast with the parent Mn2Sb2O7 compound that adopts a rhombohedral or monoclinic structure at T > 600 °C, the pyrochlore structure of CeMn3GaSb3O14 is retained up to at least T = 1070°C. High-resolution synchrotron x-ray diffraction measurements show no sign of a superstructure or distortion from cubic symmetry...

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  • Superconductivity in the intermetallic compound Zr5Al4
    Publikacja

    Polycrystalline Zr5Al4 was synthesized using the arc-melting method. Powder X-ray diffraction confirms the previously reported crystal structure of the Ti5Ga4-type P63/mcm with lattice parameters: a = 8.4312(6) A , and c = 5.7752(8) A . Electrical resistivity and low-temperature magnetic susceptibility measurements indicate that Zr5Al4 exhibits superconducting behavior below 2 K. The normalized heat capacity jump at Tc= 1.82 K...

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