Anisotropic thermopower of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br
R. C. Yu, J. M. Williams, H. H. Wang, J. E. Thompson, A. M. Kini, K. D. Carlson, J. Ren, M.-H. Whangbo, P. M. Chaikin
DOI 10.1103/PhysRevB.44.6932 · Physical Review B
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Abstract
The thermopower of the organic superconductor κ-(BEDT-TTF)2Cu[N(CN)2]Br single crystals has been measured in two crystallographic directions a and c within the most conducting organic donor molecule plane. [Here BEDT-TTF represents bis(ethylenethio)-tetrathiafulvalene.] While the thermopower in the a direction is positive, the thermopower in the c direction is negative. The drastic anisotropy in thermopower reveals that the carriers in the a direction are holelike, whereas the carriers in the c direction are electronlike. A calculation based on the tight-binding electronic band structure is able to describe the temperature dependence of the anisotropic thermopower, but with a much reduced band dispersion.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.6 | Pressure not reported | unknown |
| (BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11.4 | Pressure not reported | midpoint |
| (BEDT-TTF)2Cu[N(CN)2]Br Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.7 | Pressure not reported | onset |
| (BEDT-TTF)2Cu(SCN)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure not reported | unknown |
| (BEDT-TTF)2Cu[N(CN)2]Cl Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 12.8 | Pressure not reported | unknown |
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