Phase separation in the vicinity of the surface of -(BEDT-TTF)2Cu[N(CN)2]Br by fast cooling
Abstract
Partial suppression of superconductivity by fast cooling has been observed in the organic superconductor -(BEDT-TTF)2Cu[N(CN)2]Br by two means: a marked sample size effect on the magnetic susceptibility and direct imaging of insulating regions by scanning microregion infrared reflectance spectroscopy. Macroscopic insulating regions are found in the vicinity of the crystalline surface after fast cooling, with diameters of 50--100 μm and depths of a few μm. The very large in-plane penetration depth reported to date ( 24--100 μm) can be explained by the existence of the insulating regions.
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