Critical fields and mixed-state properties of the layered organic superconductor κ-(BEDT−TTF)2I3
S. Wanka, D. Beckmann, J. Wosnitza, E. Balthes, D. Schweitzer, W. Strunz, H. J. Keller
DOI 10.1103/PhysRevB.53.9301 · Physical Review B
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Abstract
We report on a systematic study of the thermodynamic superconducting properties on high-quality crystals of the quasi-two-dimensional (quasi-2D) organic superconductor κ-(BEDT−TTF)2I3. Low-field magnetization measurements served to determine the lower critical field Bc1. Just below Tc=3.5 K, down to ∼ 3 K, Bc1 perpendicular (⊥) to the highly conducting BEDT-TTF layers is found to be strongly suppressed below the sensitivity limit of the instrumental resolution. This might be an indication for single-vortex fluctuations expected for a strongly 2D superconductor. The critical field Bc2* determined by ac-susceptibility measurements is found to be related to an irreversibility line. The temperature and frequency dependences of Bc2* are consistent with well-established flux-creep models. The upper critical field Bc2⊥ extracted from magnetization measurements is consistent with specific-heat data. For both principal field orientations a crossover of the critical-field slopes |dBc2dT| towards a shallow tail close to Tc is observed. Apparent discrepancies of the thermodynamic critical fields for parallel and perpendicular field orientation are found, indicating either a strongly reduced Bc1∥ or Bc2∥.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure not reported | onset |
| (BEDT-TTF)2I3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 3.5 | Pressure not reported | onset |
| (BEDT-TTF)2Cu(NCS)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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