Antiferromagnetic fluctuations in a quasi-two-dimensional organic superconductor detected by Raman spectroscopy
Natalia Drichko, Rudi Hackl, John A. Schlueter
DOI 10.1103/PhysRevB.92.161112 · Physical Review B
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Abstract
Using Raman scattering, the quasi-two-dimensional organic superconductor κ−(BEDT−TTF)2Cu[N(CN)2]Br (Tc=11.8 K) and the related antiferromagnet κ−(BEDT−TTF)2Cu[N(CN)2]Cl are studied. Raman scattering provides unique spectroscopic information about magnetic degrees of freedom that has been otherwise unavailable on such organic conductors. Below T=200 K a broad band at about 500 cm−1 develops in both compounds. We identify this band with two-magnon excitation. The position and the temperature dependence of the spectral weight are similar in the antiferromagnet and in the metallic Fermi liquid. We conclude that antiferromagnetic correlations are similarly present in the magnetic insulator and the Fermi-liquid state of the superconductor.
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. | 11.8 | Pressure not reported | unknown |
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