Fermiology and superconductivity studies on the non-tetrachalcogenafulvalene structured organic superconductor beta-(BDA-TTP)_2SbF_6

TL;DR

This study investigates the quantum oscillations and superconducting properties of the organic superconductor beta-(BDA-TTP)_2SbF_6, revealing a highly anisotropic nature, a large effective mass, and detailed Fermi surface characteristics.

Contribution

It provides new insights into the Fermiology and superconductivity of a non-TCF structured organic superconductor, including measurements of quantum oscillations and anisotropic critical fields.

Findings

Fermi surface oscillation frequency ~4050 T

Highly anisotropic superconductivity observed

Largest effective cyclotron mass in an organic superconductor

Abstract

The quantum oscillatory effect and superconductivity in a non-tetrachalcogenafulvalene (TCF) structure based organic superconductor beta-(BDA-TTP)_2SbF_6 are studied. Here the Shubnikov-de Haas effect (SdH) and angular dependent magnetoresistance oscillations (AMRO) are observed. The oscillation frequency associated with a cylindrical Fermi surface is found to be about 4050 tesla, which is also verified by the tunnel diode oscillator (TDO) measurement. The upper critical field Hc2 measurement in a tilted magnetic field and the TDO measurement in the mixed state reveal a highly anisotropic superconducting nature in this material. We compared physical properties of beta-(BDA-TTP)_2SbF_6 with typical TCF structure based quasi two-dimensional organic conductors. A notable feature of beta-(BDA-TTP)_2SbF_6 superconductor is a large value of effective cyclotron mass m_c^*=12.4+/1.1 m_e, which is the largest yet found in an organic superconductor. A possible origin of the enhanced effective mass and its relation to the superconductivity are briefly discussed.