Abstract Thermoelectric power measurements are reported for seven samples with different x in the Gd1.85-xSmxCe0.15CuO4 system at temperatures ranging from 80K to 300K. For Sm-rich superconducting samples, thermoelectric power S has a small negative value and is almost temperature independent. As the content of Sm decreases, the absolute value of S increases and a broad valley appears in the S(T) curve. The results which can be interpreted in terms of a two-channel model support the existence of mid-gap states with Fermi level close to the minimum of the density of states as well as the coexistence of electron and hole carriers. It is suggested that a linear temperature dependence of S with a small negative slope is close to the intrinsic behavior in the a-b plane of normal states for superconducting samples.
Received: 09 December 1992
Accepted manuscript online:
Fund: Project supported by the National Center for Research and Development on Superconductivity of China.
Cite this article:
LIU GUO-LIANG (刘国良), LIN-ZHENG (林征), LIN QIN (林勤), ZHANG YU-FEN (张玉芬), JIANG LIAN-HUA (蒋连化), LI GUO-HONG (李国红), YAN SHOU-SHENG (阎守胜) THERMOELECTRIC POWER IN (Gd, Sm)1.85Ce0.15CuO4 SYSTEM 1993 Acta Physica Sinica (Overseas Edition) 2 930
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