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Titolo:
INVESTIGATIONS OF FERMI SURFACES AND EFFECTIVE MASSES OF THE ORGANIC SUPERCONDUCTORS (BEDO-TTF)(2)REO4(H2O) AND KAPPA-(BEDT-TTF)(2)I-3 BY SHUBNIKOV-DEHAAS AND DEHAAS-VANALPHEN MEASUREMENTS
Autore:
SCHWEITZER D; BALTHES E; KAHLICH S; 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 9 FRANCE
Titolo Testata:
Acta Physica Polonica. A
fascicolo: 4-5, volume: 87, anno: 1995,
pagine: 749 - 759
SICI:
0587-4246(1995)87:4-5<749:IOFSAE>2.0.ZU;2-1
Fonte:
ISI
Lingua:
ENG
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
D. Schweitzer et al., "INVESTIGATIONS OF FERMI SURFACES AND EFFECTIVE MASSES OF THE ORGANIC SUPERCONDUCTORS (BEDO-TTF)(2)REO4(H2O) AND KAPPA-(BEDT-TTF)(2)I-3 BY SHUBNIKOV-DEHAAS AND DEHAAS-VANALPHEN MEASUREMENTS", Acta Physica Polonica. A, 87(4-5), 1995, pp. 749-759

Abstract

The Fermi surfaces and effective masses of (BEDO-TTF)(2)ReO4(H-2 O) and kappa-(BEDT-TTF)(2)I-3 were investigated by Shubnikov-de Haas (SdH)and de Haas-van Alphen (dHvA) measurements in magnetic fields up to 27 T in the temperature range from 0.5 K to 4.2 K. Two small closed pockets (0.7% and 1.5% of the first Brillouin zone) are observed in (BEDO-TTF)(2)ReO4(H2O) corresponding very well with two cross-sectional areas of the Fermi surfaces obtained for a hole and an electron pocket from tight binding calculations. In contrast, in kappa-(BEDT-TTF)(2)I-3 two relatively large closed sections (13% and 85% of the first Brillouin zone) of the Fermi surfaces are observed, again confirming the tight binding calculations. For kappa-(BEDT-TTF)(2)I-3 in magnetic fields above 12 T the effective mass for the larger orbit, as obtained from the temperature dependence of the SdH-oscillation amplitudes, is magnetic field dependent as long as the field is arranged perpendicular to the conducting planes (Theta = 0 degrees). In contrast, from dHvA measurements - which were performed by turning the magnetic field by 27 degrees with respect to the SdH experiments - the observed effective massis field independent. We suppose that the occurrence of anyons at temperatures below 1 K and in fields above 12 T might be the reason for the observed field dependence of the effective mass in the SdH investigations under the special angle 0 degrees.

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Documento generato il 23/09/20 alle ore 15:08:46