High field magnetotransport and specific heat in YbAgCu{sub 4}

Technical Report · Fri Jul 01 04:00:00 EDT 1994

DOI:https://doi.org/10.2172/10162949· OSTI ID:10162949

Lacerda, A ^[1]; Graf, T ^[1]; Hundley, M F; Thompson, J D ^[2]; Gajewski, D ^[3]; Canfield, P C ^[4]; Fisk, Z ^[2]

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1. National High Magnetic Field Lab., Los Alamos, NM (United States). Pulse Facility
2. Los Alamos National Lab., NM (United States)
3. Univ. of California, San Diego, La Jolla, CA (United States). Dept. of Physics
4. Ames Lab., IA (United States)

The electrical resistivity ({rho}) and magnetoresistance of polycrystalline YbAgCu{sub 4} have been measured at temperatures between 25 mK and 300 K, and at magnetic fields (B) to 18 T. The magnetoresistance ({rho}(B){minus}{rho}(0))/{rho}(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 magnetoresistance behaviors 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 specific heat ({gamma}) measured at fields to 10 T shows a quadratic field dependence. The authors do not find a linear relation between {gamma}{sup 2} and A, the T{sup 2}-coefficient of the temperature-dependent resistivity, with field as the implicit parameter.

• Research Organization: Los Alamos National Lab., NM (United States)
• Sponsoring Organization: National Science Foundation, Washington, DC (United States)
• DOE Contract Number: W-7405-ENG-36
• OSTI ID: 10162949
• Report Number(s): LA-UR--94-1892; CONF-9308237--1; ON: DE94014475
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360104
COPPER ALLOYS
ELECTRIC CONDUCTIVITY
EXPERIMENTAL DATA
INTERMETALLIC COMPOUNDS
PHYSICAL PROPERTIES
SILVER ALLOYS
SPECIFIC HEAT
TEMPERATURE DEPENDENCE
YTTERBIUM BASE ALLOYS