Magnetic and superconducting properties of single-crystal TmNi{sub 2}B{sub 2}C

Journal Article · Tue Aug 01 04:00:00 EDT 1995 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.52.3676· OSTI ID:83941

Cho, B K; Xu, M; Canfield, P C; Miller, L L; Johnston, D C ^[1]

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1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011-3020 (United States)

The temperature ({ital T}) and applied magnetic field ({bold H}) dependent magnetization has been measured for a single crystal of TmNi{sub 2}B{sub 2}C in order to study the interplay of superconductivity and the magnetism of the Tm sublattice. The normal-state magnetization of TmNi{sub 2}B{sub 2}C is anisotropic from 2 to 300 K with the magnetic field applied normal to the {ital c} axis ({bold H}{perpendicular}{ital c}) leading to a smaller induced magnetization than the magnetization for the magnetic field applied parallel to the {ital c} axis ({bold H}{parallel}{bold c}). This anisotropy is attributed to crystalline electric field (CEF) splitting of the {ital J}=6 manifold of the Tm{sup +3} ion. From the inverse susceptibility [1/{chi}({ital T})] for {bold H}{parallel}{bold c} and {bold H}{perpendicular}{bold c}, the CEF parameter, {ital B}{sub 2}{sup 0}, is found to be ({minus}1.15{plus_minus}0.02) K. The superconducting state magnetization for {ital H}{approx}{ital H}{sub {ital c}2}({ital T}) obeys the Ginzburg-Landau theory which is used to evaluate the upper critical magnetic field {ital H}{sub {ital c}2}({ital T}) and {ital dH}{sub {ital c}2}/{ital dT}{vert_bar}{sub {ital T}{ital c}} values. The superconducting properties in this temperature region are similar to those of the nonmagnetic superconductor YNi{sub 2}B{sub 2}C, which has been shown to be an isotropic conventional type-II superconductor. For {ital T}{le}6 K, {ital H}{sub {ital c}2}({ital T}) shows highly anisotropic behavior: {ital H}{sub {ital c}2}{sup {perpendicular}{ital c}}{approx}2{ital H}{sub {ital c}2}{sup {parallel}{ital c}}. For both {bold H}{parallel}{bold c} and {bold H}{perpendicular}{bold c}, {ital H}{sub {ital c}2}({ital T}) reaches a broad maximum near 4 K and decreases as {ital T} approaches {ital T}{sub {ital N}}=(1.52{plus_minus}0.05) K, indicating the interplay between superconductivity and magnetism. (Abstract Truncated)

• Research Organization: Ames National Laboratory
• DOE Contract Number: W-7405-ENG-82
• OSTI ID: 83941
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 52; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
66 PHYSICS
ANISOTROPY
BORON CARBIDES
GINZBURG-LANDAU THEORY
MAGNETIC SUSCEPTIBILITY
MAGNETIZATION
MONOCRYSTALS
NICKEL CARBIDES
SUPERCONDUCTIVITY
TEMPERATURE DEPENDENCE
THULIUM CARBIDES