Pressure-induced nesting in the low-dimensional organic superconductor α-(BEDT-TTF)2NH4Hg(SCN)4
S. J. Klepper, J. S. Brooks, X. Chen, I. Bradaric, M. Tokumoto, N. Kinoshita, Y. Tanaka, C. C. Agosta
DOI 10.1103/PhysRevB.48.9913 · Physical Review B
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Abstract
Why superconductivity appears in only one member (M=NH4) of the isostructural family of organic conductors α-(BEDT-TTF)2MHg(SCN)4 is a long-standing question. Others in the family (M =K,Rb,Tl) have density-wave ground states. To address this problem, we have studied pressure effects in superconducting α-(BEDT-TTF)2NH4Hg(SCN)4 (Tc=1.0 K). Our results show a remarkable pressure dependence of the Fermi surface topology. We argue that with NH4, there are small deviations from perfect nesting of the open-orbit bands which favor superconductivity over a density-wave state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| α-(BEDT-TTF)2NH4Hg(SCN)4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure unresolved | unknown |
| α-(BEDT-TTF)2NH4Hg(SCN)4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure unresolved | unknown |
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