Hall and thermoelectric-power coefficients of superconducting Nd2CuO4−xFx

Abstract

Both the Hall coefficient (RH) and the thermoelectric-power coefficient (S) have been measured using the same polycrystalline samples of superconducting Nd2CuO4−xFx (0≤x≤0.3). For the samples with 0.1≤x≤0.3, the RH of every sample is found to be negative in the temperature range between 30 and 275 K. Furthermore, as x increases, the charge-carrier density (pH) estimated from RH at 100 K increases in proportion to x (pH=x) up to around 0.18, then much more rapidly for x≥0.18. On the other hand, the S of every sample is also found to be negative in the temperature range between 30 and 300 K. The absolute value of S is found to reduce with x up to around 0.18 and then level off to a constant value as x increases further to 0.3. The decrease in ‖S‖ due to F doping is discussed using a semiconductor model. In addition, we point out a possibility that a magnon drag plays a significant role in S for samples with x<0.18.

Source-reported materials — not catalogue approval

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