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Titolo:
ANOMALOUS BEHAVIOR OF MAGNETO-QUANTUM OSCILLATIONS IN THE ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)(2)I-3
Autore:
BALTHES E; SCHWEITZER D; HEINEN I; KELLER HJ; STRUNZ W; BIBERACHER W; JANSEN AGM; STEEP E;
Indirizzi:
UNIV STUTTGART,INST PHYS 3,PFAFFENWALDRING 57 D-70550 STUTTGART GERMANY UNIV HEIDELBERG,INST ANORGAN CHEM D-69120 HEIDELBERG GERMANY WALTHER MEISSNER INST TIEFTEMP FORSCH D-85748 GARCHING GERMANY MAX PLANCK INST FESTKORPERFORSCH,HIGH FIELD MAGNET LAB F-38042 GRENOBLE FRANCE CNRS F-38042 GRENOBLE FRANCE
Titolo Testata:
Zeitschrift fur Physik. B, Condensed matter
fascicolo: 2, volume: 99, anno: 1996,
pagine: 163 - 171
SICI:
0722-3277(1996)99:2<163:ABOMOI>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
FERMI-SURFACE; STATISTICS;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
26
Recensione:
Indirizzi per estratti:
Citazione:
E. Balthes et al., "ANOMALOUS BEHAVIOR OF MAGNETO-QUANTUM OSCILLATIONS IN THE ORGANIC SUPERCONDUCTOR KAPPA-(BEDT-TTF)(2)I-3", Zeitschrift fur Physik. B, Condensed matter, 99(2), 1996, pp. 163-171

Abstract

kappa-(BEDT-TTF)(2)I-3 is an extreme case of an electronically two-dimensional (2D) organic metal with a superconducting transition at around 4 K. In magnetic fields up to 27 T the field, angular and the temperature dependence of de Haas-van Alphen (dHvA) and Shubnikov-de Haas (SdH) oscillation amplitudes were investigated. From the temperature dependence of the oscillation amplitudes the cyclotron effective mass mwas investigated using Lifshitz-Kosevich formula (LK) and the surprising result is, that m appears to be magnetic field dependent as soon as the magnetic field is applied exactly perpendicular to the conducting planes so that the cyclotron orbit lies within those planes (i.e. Theta = 0 degrees), but field independent at Theta not equal 0 degrees. It is shown that the LK formula can satisfactorily be used for the interpretation of all data obtained at Theta not equal 0 degrees but notin the case where Theta = 0 degrees. An explanation of the anomalous data at Theta = 0 degrees can furthermore neither be given satisfactorily by the descriptions of magneto-quantum oscillations in 2D electronic systems nor by the occurrence of magnetic interaction effects (MI). Tentatively, the observed smaller oscillation amplitudes in kappa-(BEDT-TTF)(2)I-3 at Theta = 0 degrees above 12 T and below 1 K compared to the standard LK theory will be discussed in terms of a loss in the number of fermions by the occurrence of quasiparticles with fractional statistics.

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Documento generato il 27/09/20 alle ore 20:48:04