Low-temperature far-infrared absorption in the antiferromagnetic organic superconductor κ−(BETS)2FeBr4
N. Hossein Khah, G. V. Sudhakar Rao, M. Reedyk, H. Fujiwara, H. Kobayashi, T. Nakamura, K. Yakushi, M. A. Tanatar
DOI 10.1103/PhysRevB.81.092508 · Physical Review B
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Abstract
Organic salt κ−(BETS)2FeBr4 is a unique compound in which local moment antiferromagnetism of Fe3+ ions (below Néel temperature TN of 2.5 K) coexists with bulk superconductivity (below the superconducting transition temperature TC=1.1 K). To probe this unique coexistence we studied the low-temperature far-infrared optical response in a frequency range of 7–40 cm−1, a characteristic energy range for superconducting and magnetic gaps. Measurements were undertaken using a polarizing interferometer and a He3 cryostat in a temperature range 0.5–2.8 K. The spectrum shows a clear change on crossing both TN and TC. An absorption feature below TN is interpreted as a signature for the formation of a magnetic pseudogap. The observed increased reflectance relative to the normal state at temperatures below TC sets a value of the superconducting energy gap Δ0 in the strong coupling regime, 2Δ0≈8kbTC.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| κ-(BETS)2FeBr4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | zero_resistance |
| κ-(BETS)2FeBr4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | onset |
| κ-(BETS)2GaBr4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.1 | Pressure not reported | unknown |
| κ-(BETS)2FeCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 0.1 | Pressure not reported | unknown |
| κ-(BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10.4 | Pressure not reported | unknown |
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