We present magnetic torque measurements on the quasi-two-dimensional organic superconductor (Formula presented)-(BEDT-TTF)(Formula presented) at low temperature (Formula presented). The irreversible field (Formula presented) lies far below the upper critical field (Formula presented) even at (Formula presented) In the magnetic field region, (Formula presented) a vortex liquid state exists even at (Formula presented) resulting from the quantum fluctuations instead of the contribution of the thermal one at higher temperature. This finding is explained as the quantum vortex liquid state driven by the quantum fluctuations from the different theoretical models. In the liquid state, de Haas-van Alphen oscillations are observed, and (Formula presented) is defined by the appearance of the additional damping on the oscillation amplitude.
|Number of pages||4|
|Journal||Physical Review B - Condensed Matter and Materials Physics|
|Publication status||Published - 1998 Jan 1|
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics