Superfluid density versus transition temperature in a layered organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br under pressure
Kodai Wakamatsu, Kazuya Miyagawa, Kazushi Kanoda
DOI 10.1103/PhysRevResearch.2.043008 · Physical Review Research
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Abstract
A deficiency in the superfluid density in overdoping cuprates is an unconventional feature of keen interest in superconductivity with an electron correlation and, likewise, it was previously suggested that pressure, which weakens the electron correlation, induces an increased deficiency in the superfluid density in an organic superconductor with a fixed band filling. Here, we report our magnetic penetration depth measurements of a layered organic superconductor situated near a Mott transition under various pressures to revisit the issue of superfluid density. The analyses of the results find no meaningful variation in superfluid density with increasing pressure, which greatly suppresses the superconducting transition temperature.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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. | 11.5 | Pressure unresolved | 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. | 4.6 | 0.26 GPa | onset |
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
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