Symmetry change of d-wave superconductivity in κ-type organic superconductors
S. Imajo, K. Kindo, Y. Nakazawa
DOI 10.1103/PhysRevB.103.L060508 · Physical Review B
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Abstract
Magnetic-field-angle-resolved heat capacity of dimer-Mott organic superconductors κ−(BEDT−TTF)2X is reported (BEDT-TTF and X represent bis(ethylenedithio)tetrathiafulvalene and a monovalent anion, respectively). Temperature and field dependence of heat capacity indicates that the superconductivity has line nodes on the Fermi surface, which is a typical feature of d-wave superconductivity. In-plane field-angle dependence exhibits fourfold oscillations as well as twofold oscillations due to anisotropy of superconducting gap functions. From analyses of the fourfold term, the gap symmetry is determined as dx2−y2+s± for X=Cu[N(CN)2]Br and dxy for X=Ag(CN)2H2O. We suggest that the symmetry difference comes from the competition of dxy and dx2−y2 antiferromagnetic fluctuations depending on lattice geometry.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BEDT-TTF)2Ag(CN)2H2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.2 | Pressure not reported | onset |
| κ-(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. | 11.3 | Pressure not reported | onset |
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