Paramagnetic limiting of the upper critical field of the layered organic superconductorκ−(BEDT−TTF)2Cu(SCN)2
| Autor: | Jack M. Williams, Ross H. McKenzie, James S. Brooks, F. Zuo, John A. Schlueter |
|---|---|
| Rok vydání: | 2000 |
| Předmět: |
Superconductivity
Physics Zeeman effect Magnetoresistance Field (physics) Condensed matter physics 02 engineering and technology BCS theory 021001 nanoscience & nanotechnology 01 natural sciences Paramagnetism symbols.namesake Condensed Matter::Superconductivity 0103 physical sciences Organic superconductor symbols Condensed Matter::Strongly Correlated Electrons 010306 general physics 0210 nano-technology Critical field |
| Zdroj: | Physical Review B. 61:750-755 |
| ISSN: | 1095-3795 0163-1829 |
| DOI: | 10.1103/physrevb.61.750 |
| Popis: | We report detailed measurements of the interlayer magnetoresistance of the layered organic superconductor kappa-(BEDT-TTF)(2)Cu(SCN)(2) for temperatures down to 0.5 K and fields up to 30 T. The upper critical field is determined from the resistive transition for a wide range of temperatures and field directions. For magnetic fields parallel to the layers, the upper critical field increases approximately linearly with decreasing temperature. The upper critical field at low temperatures is compared to the Pauli paramagnetic limit, at which singlet superconductivity should be destroyed by the Zeeman splitting of the electron spins. The measured value is comparable to a value for the paramagnetic limit calculated from thermodynamic quantities but exceeds the limit calculated from BCS theory. The angular dependence of the upper critical field shows a cusplike feature for fields close to the layers, consistent with decoupled layers. |
| Databáze: | OpenAIRE |
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