THERMOELECTRIC POWER IN (Gd, Sm)1.85Ce0.15CuO4 SYSTEM |
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Authors: | LIU GUO-LIANG LIN-ZHENG LIN QIN ZHANG YU-FEN JIANG LIAN-HUA LI GUO-HONG YAN SHOU-SHENG |
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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. |
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