Charge imbalance in λ−(BETS)2GaCl4 and their interplay with superconductivity
Olga Iakutkina, Ece Uykur, Takuya Kobayashi, Atsushi Kawamoto, Martin Dressel, Yohei Saito
DOI 10.1103/PhysRevB.104.045108 · Physical Review B
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Abstract
The two-dimensional organic superconductor λ−(BETS)2GaCl4 exhibits pronounced charge fluctuations below T≈150 K, in contrast to the sibling compound κ−(BETS)2GaCl4 that remains metallic down to milli-Kelvin. Infrared spectroscopy reveals only minor splitting in the vibrational features of the latter compound, common to other strongly dimerized κ-type salts. When the organic molecules are arranged in the λ-type pattern, however, a strong vibrational ν27(b1u) mode is present that forms a narrow doublet. Most important, when cooling λ−(BETS)2GaCl4 below 150 K, two weak side modes appear due to charge disproportionation that amounts to 2δ=0.14e. In analogy to the β′′-type organic conductors, we propose that charge fluctuations play an important role in emerging of unconventional superconductivity in λ−(BETS)2GaCl4 at Tc=4.7 K. We discuss the possibility of a charge-density wave that coexists with the proposed spin-density-wave state.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.7 | Pressure not reported | midpoint |
| λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.8 | Pressure not reported | onset |
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