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Titolo:
INVESTIGATIONS OF FERMI SURFACES AND CYCLOTRON EFFECTIVE MASSES OF ORGANIC SUPERCONDUCTORS BY SHUBNIKOV-DEHAAS (SDH)-MEASUREMENT AND DEHAAS-VANALPHEN (DHVA)-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:
Synthetic metals
fascicolo: 1-3, volume: 70, anno: 1995,
pagine: 857 - 860
SICI:
0379-6779(1995)70:1-3<857:IOFSAC>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
KAPPA-(BEDT-TTF)2I3;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
11
Recensione:
Indirizzi per estratti:
Citazione:
D. Schweitzer et al., "INVESTIGATIONS OF FERMI SURFACES AND CYCLOTRON EFFECTIVE MASSES OF ORGANIC SUPERCONDUCTORS BY SHUBNIKOV-DEHAAS (SDH)-MEASUREMENT AND DEHAAS-VANALPHEN (DHVA)-MEASUREMENTS", Synthetic metals, 70(1-3), 1995, pp. 857-860

Abstract

The Fermi surfaces (FS) and effective masses of the organic superconductors (BEDO-TTF)(2)ReO4(H2O) (1) AND kappa-(BEDT-TTF)(2)I-3 (2) were investigated by SdH- and dHvA-measurements in magnetic fields up to 27T in the temperature range from 0.5K to 4.2K. In 1 two small closed pockets (0.7% and 1.5% of the first Brillouin zone [FBZ]) are observed corresponding very well with two cross-sectional areas of the FS obtained for a hole and electron pocket from tight binding calculations. In contrast to 1 in 2 two relatively large closed sections (13% and 85% of the FBZ) of the FS are observed, again cofirming the tight binding calculations. For 2 in magnetic fields above 12T the effective mass forthe larger orbit, as obtained from the temperature dependence of the SdH-oscillation amplitudes, is magnetic field dependent as long as thefield is arranged perpendicular to the conducting planes. In contrast, from dHvA-measurements - which were performed by turning the magnetic field by 27 degrees with respect to SdH-experiments - the observed effective mass is field independent (m=39m(0)). We suppose that the occurrence of particles with fractional statistics at temperatures below1K and in fields above 12T might be the reason for the observed fielddependence of the effective mass in the SdH investigations.

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Documento generato il 27/09/20 alle ore 22:19:49