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Effect of high hydrostatic pressure on the magnetoresistance quantum oscillations of the quasi‐two‐dimensional organic superconductor x‐(BEDT‐TTF) 2 i 3
Author(s) -
Helm P.,
Kraak W.,
Schweitzer D.
Publication year - 1996
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221950126
Subject(s) - hydrostatic pressure , fermi surface , condensed matter physics , magnetoresistance , quantum oscillations , isostructural , shubnikov–de haas effect , magnetic field , organic superconductor , chemistry , superconductivity , physics , crystal structure , crystallography , quantum mechanics , thermodynamics
High‐field magnetotransport investigations of single crystals of the quasi‐two‐dimensional organic compound x‐(BEDT‐TTF) 2 I 3 under hydrostatic pressure up to 9 × 10 8 Pa are presented. Pronounced Shubnikov‐de Haas oscillations are observed in magnetic fields up to 12 T over the whole pressure range. These quantum oscillations are affected remarkably by hydrostatic pressure. All of the four fundamental fields detected rise with increasing pressure corresponding to an enhancement of the extremal areas of the Fermi surface in x‐(BEDT‐TTF) 2 I 3 . The experimentally determined cyclotron effective masses of the charge carriers decrease with increasing pressure. The FFT amplitudes of the Shubnikov‐de Haas oscillations show a very complex pressure dependence reflecting a more complicated structure of the electron system than the relatively simple topology of the calculated Fermi surface involves. The pressure‐induced changes of the Fermi surface are discussed in the framework of an effective dimer model and compared with equivalent investigations on the isostructural compound x‐(ET) 2 Cu(NCS) 2 .