High field magnetotransport and specific heat in YbAgCu4

✍ Scribed by A. Lacerda; T. Graf; M.F. Hundley; M.S. Torikachvili; J.M. Lawrence; J.D. Thompson; D. Gajewski; P.C. Canfield; Z. Fisk

• Publisher: Elsevier Science
• Year: 1995
• Tongue: English
• Weight: 185 KB
• Volume: 206-207
• Category: Article
• ISSN: 0921-4526
• DOI: 10.1016/0921-4526(94)00458-8

✦ Synopsis

The electrical resistivity (p) and magnetoresistance of polycrystalline YbAgCu 4 have been measured at temperatures between 25 mK and 300 K, and at magnetic fields (B) up to 18 T. The magnetoresistance (p(B)p(0))/p(0)) is positive at all temperatures below 200 K and reaches its maximum of 60% at 18 T and 25 mK. The field-and temperature-dependent resistivity does not scale in a simple way. The opposite sign of the magnetoresistance at ambient and high pressure can be explained qualitatively by crystal-field effects lifting the degeneracy of the J = 7/2 groundstate. The linear coefficient of the specific heat (3') measured at fields up to 10 T shows a quadratic field dependence. We did not find a linear relation between 3, 2 and A, the T2-coefficient of the temperature-dependent resistivity, with the applied magnetic field as the implicit parameter.