Complex transport and magnetism of the ternary boride YbPt5B2

Article

关键词: TOTAL-ENERGY CALCULATIONS;    PHYSICAL-PROPERTIES;    CRYSTAL-STRUCTURE;    SUPERCONDUCTIVITY;    METALS;    FIELD;    HEAT;    CE;   

DOI  :  10.1103/PhysRevB.105.205112

来源: SCIE

【 摘 要 】

Novel ternary platinum borides YbPt5B2 and LuPt5B2 have been synthesized by arc melting of constituent elements and subsequent annealing at 1020 K. The unit cell of YbPt5B2 [YbPt5B2 type, monoclinic space group C2/m, a = 15.4982(6) angstrom, b = 5.5288(3) angstrom, c = 5.5600(3) angstrom, beta = 105.367(3)degrees, single-crystal x-ray diffraction data] is composed of two structural fragments alternating along the a axis and extending infinitively along the b axis: (i) columns of face-fused, boron-filled, and empty edge-connected trigonal metal prisms, and (ii) zigzag chains of B-filled trigonal prisms connected by common edges. LuPt5B2 was found to be isotypic (Rietveld refinement of powder x-ray diffraction data). YbPt5B2 exhibits two magnetic phase transitions at T-mag1 similar to 8 K and T-mag2 similar to 4 K as deduced from specific heat, magnetostriction, electric resistivity, and magnetization data. The Kadowaki-Woods ratio of 1.22 x 10(-5) mu Omega cm(mol K/mJ)(2) classifies YbPt5B2 as a heavy fermion system. A magnetic phase diagram was established, using magnetostriction and magnetoresistance data. Nonmagnetic LuPt5B2 is characterized by a simple metallic behavior.

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