Thermoelectric power of the (Eu,Ce)4(Ba,Eu)4Cu6Oy phase and the T* phase: Comparison between superconducting and nonsuperconducting compounds
S. Ikegawa, T. Wada, T. Yamashita, A. Ichinose, K. Matsuura, K. Kubo, H. Yamauchi, S. Tanaka
DOI 10.1103/PhysRevB.43.11508 · Physical Review B
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Abstract
The Seebeck coefficient (S) and Hall coefficient (RH) are mea- sured in the temperature range 20–310 K for (L2/3Ce1/3)4(La1/3Ba1/3Sr1/3)4Cu6Oy (4:4:6 phase) with L=Eu (superconducting) and L=Y (nonsuperconducting), and Nd1.4Ce0.2Sr0.4Cu1−xZnxO4−δ (T* phase) with x=0 (superconducting) and x=0.015 (nonsuperconducting). In both the 4:4:6 phase and the T* phase, the RH of the nonsuperconducting compound is nearly the same as that of the superconducting compound, at temperatures higher than 150 K, but S of the nonsuperconducting compound is larger than that of the superconducting compound throughout the measured temperature range. This suggests that the contribution from carrier scattering to S is different in the nonsuperconducting and superconducting compounds. The temperature dependence of S for these compounds is compared with a theoretical prediction for the resonating-valence-bond state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Eu2/3Ce1/3)4(La1/3Ba1/3Sr1/3)4Cu6Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 28.5 | Pressure not reported | onset |
| Nd1.4Ce0.2Sr0.4CuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 23.1 | Pressure not reported | onset |
| La1.85Sr0.15CuO4-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 38.3 | Pressure not reported | onset |
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