Tunneling spectroscopy on the organic superconductor κ−(BEDT−TTF)2Cu(NCS)2 using STM
T. Arai, K. Ichimura, K. Nomura, S. Takasaki, J. Yamada, S. Nakatsuji, H. Anzai
DOI 10.1103/PhysRevB.63.104518 · Physical Review B
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Abstract
STM spectroscopy on the organic superconductor κ−(BEDT−TTF)2Cu(NCS)2 has been performed in the superconducting state with the use of single crystals. The anisotropy of the superconducting gap has been investigated both on the b−c plane, which is parallel to the two-dimensional conducting layers, and on the several surfaces perpendicular to the b−c plane. The tunneling spectra observed on the b−c plane are well explained by the anisotropic gap with the d-wave symmetry. The spectra on the lateral surfaces are also consistent with the d-wave gap with line nodes along the direction π/4 from the kb and kc axes considering the k dependence of the tunneling transition probability. These results strongly indicate that the superconducting pair wave function in this salt has the dx2−y2-wave symmetry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure not reported | midpoint |
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