Two-dimensional magnetic quantum oscillations observed in an organic metal

Hagel, J.; Wanka, S.; Wosnitza, J.; Balthes, E.; Schlueter, J. A.; Kini, A. M.; Geiser, U.; Mohtasham, J.; Winter, R.; Gard, Gary L.

doi:10.1016/s0379-6779(00)01089-4

Cited by 5 publications

(5 citation statements)

References 3 publications

(5 reference statements)

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“…A similar result was obtained by Hayes et al The size of the Fermi surface was also deduced from de Haas−van Alphen (dHvA) oscillations . Additional evidence for the elongated Fermi surface pocket comes from observation of cyclotron resonances in millimeter wave absorption in a varying magnetic field. , The dHvA signal exhibited an almost ideal inverse saw tooth shape, which was very well reproduced with the assumption of a perfectly two-dimensional metal with a charge-carrier reservoir. , This explanation implies the presence of a fixed chemical potential, presumably due to the presence of localized electron states at the Fermi surface. It furthermore requires the existence of a quasi-1D band (in agreement with the calculated band electronic structure) and an exceptionally large density of states of this band (in contradiction to the band electronic structure).…”

Section: 22 Superconductor (Et)2sf5ch2cf2so3supporting

confidence: 71%

“…95,96 The dHvA signal exhibited an almost ideal inverse saw tooth shape, which was very well reproduced with the assumption of a perfectly two-dimensional metal with a charge-carrier reservoir. 97,98 This explanation implies the presence of a fixed chemical potential, presumably due to the presence of localized electron states at the Fermi surface. It furthermore requires the existence of a quasi-1D band (in agreement with the calculated band electronic structure) and an exceptionally large density of states of this band (in contradiction to the band electronic structure).…”

Section: Superconductor (Et) 2 Sf 5 Ch 2 Cf 2 Somentioning

confidence: 99%

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Conducting Organic Radical Cation Salts with Organic and Organometallic Anions

2004

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Section: 22 Superconductor (Et)2sf5ch2cf2so3supporting

confidence: 71%

Section: Superconductor (Et) 2 Sf 5 Ch 2 Cf 2 Somentioning

confidence: 99%

Conducting Organic Radical Cation Salts with Organic and Organometallic Anions

2004

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“…In addition, although the dHvA signal could be described extraordi-narily well by theory [5] small deviations still are visible (see Fig. 2 below) [10]. Here, we prove this latter feature to be valid by careful additional measurements utilizing the modulation-field technique.…”

supporting

confidence: 64%

Spin-zero anomaly in the magnetic quantum oscillations of a two-dimensional metal

et al. 2008

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Fermiology and superconductivity at high magnetic fields in a completely organic cation radical salt J S Brooks, V Williams, E Choi et al. Abstract. We report on an anomalous behavior of the spin-splitting zeros in the de Haas-van Alphen (dHvA) signal of a quasi-two-dimensional organic superconductor. The zeros as well as the angular dependence of the amplitude of the second harmonic deviate remarkably from the standard Lifshitz-Kosevich (LK) prediction. In contrast, the angular dependence of the fundamental dHvA amplitude as well as the spin-splitting zeros of the Shubnikov-de Haas (SdH) signal follow the LK theory. We can explain this behavior of the dHvA signal by small chemical-potential (CP) oscillations and find a very good agreement between theory and experiment. A detailed wave-shape analysis 7 Present address: Royal Holloway, University of London, Egham, Surrey TW20 0EX, UK. 8 Author to whom any correspondence should be addressed. of the dHvA oscillations corroborates the existence of an oscillating CP. We discuss the absence of the above spin-zero effect in the SdH signal and argue that in β -(BEDT-TTF) 2 SF 5 CH 2 CF 2 SO 3 it can be explained by an incoherent variable range hopping interlayer transport which is insensitive to the small CP oscillations. Contents

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“…The calculations leading to the curves in Figure 35 have been made with the assumption of negligibly small chemical potential oscillations. This assumption is justified by the analysis of the dHvA oscillations, 232,275 as discussed in section 3.4.1. It should be noted that the model 293 gives reasonable results only under the condition of a finite electron reservoir, n R > 0, which serves to stabilize the chemical potential ζ between Landau levels.…”

Section: Highly Two-dimensional Limitmentioning

confidence: 99%

“…It is not clear whether one can expect such a high density of states on the open Fermi sheets. Besides, it was noted that the numerical model 165 reproduces the experimental data less accurately than the LKS formula.…”

Section: 41 β‘ ‘-(Bedt-ttf)2sf5ch2cf2so3mentioning

confidence: 99%