Electron spin resonance of Gd{sup 3+} in the normal state of RNi{sub 2}B{sub 2}C (R=Y,Lu)

Journal Article · Sun Feb 01 04:00:00 EST 1998 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.57.3668· OSTI ID:568336

Pagliuso, P G; Rettori, C; Oseroff, S B ^[1]; Canfield, P C ^[2]; Baggio-Saitovitch, E M; Sanchez, D ^[3]

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1. Instituto de Fisica GlebWataghin, UNICAMP, 13083-970, Campinas-SP (Brazil)
2. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
3. CBPF, R. Xavier Sigaud 150, 22290-180, Rio de Janeiro (Brazil)

Electron spin resonance (ESR) of Gd{sup 3+} in the normal state (T{gt}T{sub c}) of R{sub 1{minus}x}Gd{sub x}Ni{sub 2}B{sub 2}C (R=Y,Lu) is reported. The results show that the exchange coupling between the rare-earth localized magnetic moment and the conduction electrons depends on the conduction electrons momentum transfer ({vert_bar}{bold k}{sub F}{sup in}{minus}{bold k}{sub F}{sup out}{vert_bar}=q), i.e., J{sub fs}(q). The temperature dependence of the ESR linewidth yields a value for one of the exchange parameters, {l_angle}J{sub fs}{sup 2}(q){r_angle}{sub E{sub F}}{sup 1/2}, which is in agreement with that estimated from the slope of the initial linear decrease of T{sub c} by the Gd{sup 3+} impurities. These results indicate that the R{sub 1{minus}x}Gd{sub x}Ni{sub 2}B{sub 2}C (R=Y,Lu) compounds behave as conventional BCS superconductors, in agreement with previous reports. {copyright} {ital 1998} {ital The American Physical Society}

• OSTI ID: 568336
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 6 Vol. 57; ISSN PRBMDO; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BCS THEORY
BORON CARBIDES
ELECTRON SPIN RESONANCE
EXCHANGE INTERACTIONS
GADOLINIUM CARBIDES
GADOLINIUM COMPOUNDS
GADOLINIUM IONS
IMPURITIES
LUTETIUM CARBIDES
LUTETIUM COMPOUNDS
MAGNETIC MOMENTS
MAGNETIZATION
NICKEL CARBIDES
NICKEL COMPOUNDS
YTTRIUM CARBIDES
YTTRIUM COMPOUNDS