Electron spin resonance of Gd3+ in the normal state of RNi2B2C (R=Y,Lu)
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1998-02-01
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American Physical Society
Abstract
Electron spin resonance (ESR) of Gd3+ in the normal state (T>T-c) of R1-xGdxNi2B2C (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 (\k(F)(in)-k(F)(out)\ = q), i.e., J(fs)(q). The temperature dependence of the ESR linewidth yields a value for one of the exchange parameters, [J(fs)(2)(q)](EF)(1/2), which is in agreement with that estimated from the slope of the initial linear decrease of T-c by the Gd3+ impurities. These results indicate that the R1-xGdxNi2B2C (R=Y,Lu) compounds behave as conventional BCS superconductors, in agreement with previous reports.
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This article is published as Pagliuso, P. G., C. Rettori, S. B. Oseroff, P. C. Canfield, E. M. Baggio-Saitovitch, and D. Sanchez. "Electron spin resonance of Gd 3+ in the normal state of R Ni 2 B 2 C (R= Y, L u)." Physical Review B 57, no. 6 (1998): 3668.
DOI: 10.1103/PhysRevB.57.3668.
Copyright 1998 American Physical Society.
Posted with permission.