Phys. Rev. B 66, 212410 (2002) [4 pages]Magnetization-dependent electronic transport in Eu-based hexaborides |
G. A. Wigger, Ch. Wälti *, and H. R. Ott
Laboratorium für Festkörperphysik, ETH-Hönggerberg, CH-8093 Zürich, Switzerland
A. D. Bianchi † and Z. Fisk
National Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306
Received 22 October 2002; published 27 December 2002
We have measured the electrical resistivity, the magnetoresistance, the magnetization M, and the Hall effect of single-crystalline Eu0.6Ca0.4B6 at temperatures between 0.34 and 300 K and in magnetic fields between 0 and 70 kOe. The compound orders ferromagnetically at 4.5 K. The Hall coefficient RH is well described by a single function of M at all covered temperatures and external magnetic fields. In the magnetically ordered phase, the electrical resistivity at constant temperature decreases exponentially with increasing bulk magnetization M, suggesting the presence of some intrinsic spin-filter-type tunnel barriers in this material.
©2002 The American Physical Society
URL: http://link.aps.org/abstract/PRB/v66/e212410
DOI: 10.1103/PhysRevB.66.212410
PACS: 75.25.+z, 75.50.Cc, 75.60.-d, 72.15.-v
* Present address: Cavendish Laboratory, Madingley Road, Cambridge CB3 0HE, UK.
† Present address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545.
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