skip to main content

SciTech ConnectSciTech Connect

Title: Thermodynamic and transport properties of single-crystal Yb{sub 14}MnSb{sub 11}

Relatively large (up to 250 mg) single crystals of the intermetallic compound Yb{sub 14}MnSb{sub 11} have been prepared by a flux-growth technique. The results of thermodynamic and transport measurements of these samples are presented. The compound orders ferromagnetically at approximately T{sub C}=53{plus_minus}1K, with a magnetization consistent with the assignment Mn{sup 3+} (3d{sup 4}) and Yb{sup 2+} (4f{sup 14}). The Mn moments are local in nature, with the full effective and saturated moment of the Hund{close_quote}s rule spin-only ground state. The electrical resistivity has a metallic temperature dependence, with only a modest anisotropy. Room-temperature values of the resistivity are relatively high for an intermetallic compound: 1630{plus_minus}160 {mu}{Omega}cm and 1250{plus_minus}130 {mu}{Omega}cm for currents flowing approximately parallel and perpendicular to the {ital c} axis, respectively. There is a distinct loss of spin-disorder scattering in the resistivity at T{sub C}. From the heat capacity, a rough estimation of the magnetic entropy gives {Delta}S{sub M}{approx}12.1 J/mol K, the value in reasonable agreement with the expected {Delta}S{sub M}{approx}R ln 5 from the assignment of these moments. All of these data are consistent with a picture of Mn{sup 3+} local moments being coupled via conduction electrons. To this end, Yb{sub 14}MnSb{sub 11} appears to be analogous tomore » local-moment rare-earth intermetallic compounds, and may point the way toward a class of 3d Kondo lattice compounds. {copyright} {ital 1999} {ital The American Physical Society}« less
Authors:
; ; ;  [1] ; ;  [2]
  1. Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011 (United States)
  2. Department of Chemistry, One Shields Avenue, University of California, Davis, California 95616 (United States)
Publication Date:
OSTI Identifier:
348259
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review, B: Condensed Matter; Journal Volume: 59; Journal Issue: 21; Other Information: PBD: Jun 1999
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; THERMODYNAMICS; KONDO EFFECT; MANGANESE ALLOYS; ANTIMONY ALLOYS; YTTERBIUM ALLOYS; SPECIFIC HEAT; ENTROPY; FERROMAGNETIC MATERIALS; GROUND STATES; CHARGED-PARTICLE TRANSPORT; MAGNETIZATION; SPIN; ELECTRIC CONDUCTIVITY