Two-band conduction in the normal state of a superconducting Sm1.85Ce0.15CuO4 single crystal

✍ Scribed by M.A. Crusellas; J. Fontcuberta; S. Piñol; M. Cagigal; J.L. Vicent

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 651 KB
• Volume: 210
• Category: Article
• ISSN: 0921-4534
• DOI: 10.1016/0921-4534(93)90027-n

✦ Synopsis

Magnetoresistivity

measurements above r, ( zz 14 K) on a superconducting Sml.g5Ce,,,5Cu0., single crystal have been performed. In spite of the cerium doping, the low-temperature normal state Hall coefftcient is found to be positive, whereas at high temperature (T> 80 K) it becomes negative. The magnetoresistivity has a positive quadratic field dependence. Both magnetotransport coefftcients and resistivity are analyzed in terms of a two-band model. We show that the available data can be quantitatively described by the competing contributions of electrons and hole-like charge carriers having mobilities pm1 z T*. Holes dominate the low-temperature transport properties.