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Oscillation Phenomena on the Magnetoresistance of the Organic Superconductor K ‐(BEDT‐TTF) 2 I 3
Author(s) -
Helm P.,
Kraak W.,
Schweitzer D.,
Keller H. J.
Publication year - 1995
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.2221890219
Subject(s) - magnetoresistance , condensed matter physics , organic superconductor , quantum oscillations , magnetic field , fermi surface , oscillation (cell signaling) , shubnikov–de haas effect , superconductivity , physics , field (mathematics) , perpendicular , plane (geometry) , chemistry , quantum mechanics , geometry , biochemistry , mathematics , pure mathematics
High‐field magnetotransport properties of single crystal samples of the quasi‐two‐dimensional organic compound K ‐(BEDT‐TTF) 2 I 3 are investigated at low temperatures in magnetic fields up to 12 T. Pronounced quantum oscillations of the magnetoresistance (Shubnikov‐de Haas effect) are observed in magnetic fields above 8 T. In the magnetic field orientation perpendicular to the high conducting b−c plane four different SdH oscillations with fundamental fields 570, 2710, 3280, and 3850 T are detected. The corresponding extremal areas of the cross sections of the Fermi surface are found to be in good agreement with theoretical band structure calculations. For the first time “giant” angular oscillations of the magnetoresistivity are observed in K ‐(BEDT‐TTF) 2 I 3 . These oscillations are periodic in tan θ in agreement with the quasi‐classical explanation by Yamaji. From the experimental data the electronic parameter π/ ak F ≈ 0.58 can be estimated.