Superconducting and calorimetric properties of ThPt{sub 2}B{sub 2}C and the anomalous {ital T}{sub {ital c}} variation for nonmagnetic {ital R}Pt{sub 2}B{sub 2}C systems ({ital R}=Y,Th,La)

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.3492· OSTI ID:279471

Jeng, F S; You, Y B; Ku, H C ^[1]; Ho, J C ^[2]

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1. Department of Physics, National Tsing Hua University, Hsinchu, Taiwan 300, Republic of (China)
2. Department of Physics and National Institute for Aviation Research, Wichita State University, Wichita, Kansas 67260 (United States)

Superconducting quantum interference device dc magnetic susceptibility, ac magnetic susceptibility, ac electrical resistivity, and specific-heat measurements on bulk and powder samples of ThPt{sub 2}B{sub 2}C shows a bulk superconducting transition {ital T}{sub {ital c}} of 7 K with a transition width of 6.6{endash}7.4 K. The low-temperature normal-state specific-heat data yield an electronic-term coefficient {gamma} of 8.5 mJ/molK{sup 2}, a Debye temperature {theta}{sub {ital D}} of 330 K, and a bulk superconducting specific-heat jump {Delta}{ital C} at a {ital T}{sub {ital c}} of 1.53 {gamma}{ital T}{sub {ital c}}. Contrary to the smooth variation of {ital T}{sub {ital c}} with the {ital T}-{ital T} in-plane distance for the nonmagnetic {ital RT}{sub 2}B{sub 2}C systems ({ital R}=Y, Th, La; {ital T}=Ni,Pd), an anomalous {ital T}{sub {ital c}} variation with the Pt-Pt in-plane distance {ital d}(Pt-Pt) was observed for the nonmagnetic {ital R}Pt{sub 2}B{sub 2}C system ({ital R}=Y, Th, La). This anomalous {ital T}{sub {ital c}}-{ital d}(Pt-Pt) relationship, along with the specific-heat {gamma} value and normal-state Pauli paramagnetic susceptibility of lower-{ital T}{sub {ital c}} ThPt{sub 2}B{sub 2}C, suggests the importance of the Pt(5{ital d})-dominated conduction band. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 279471
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BORIDES
CARBIDES
ELECTRONIC STRUCTURE
LANTHANUM COMPOUNDS
MAGNETIC SUSCEPTIBILITY
PLATINUM COMPOUNDS
SPECIFIC HEAT
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
TEMPERATURE RANGE 0000-0013 K
THORIUM COMPOUNDS
TRANSITION TEMPERATURE
YTTRIUM COMPOUNDS