Magnetic-field-induced dimensional crossover in the organic metal $\alpha$-(BEDT-TTF)${}_2$KHg(SCN)${}_4$

Abstract

The field dependence of interlayer magnetoresistance of the pressurized (to the normal state) layered organic metal $\alpha$-(BEDT-TTF)${}_2$KHg(SCN)${}_4$ is investigated. The high quasi-two-dimensional anisotropy, when the interlayer hopping time is longer than the electron mean-free time and than the cyclotron period, leads to a dimensional crossover and to strong violations of the conventional three-dimensional theory of magnetoresistance. The monotonic field dependence is found to change from the conventional behavior at low magnetic fields to an anomalous one at high fields. The shape of Landau levels, determined from the damping of magnetic quantum oscillations, changes from Lorentzian to Gaussian. This indicates the change of electron dynamics in the disorder potential from the usual coherent three-dimensional regime to a new regime, which can be referred to as weakly coherent.

7 pages, 5 figures

References in corpus (7)

• Anomalous c-axis transport in layered metals
• Sensitivity of the interlayer magnetoresistance of layered metals to intralayer anisotropies
• Weakly incoherent magnetotransport in layered metals
• Persistence to high temperatures of interlayer coherence in an organic superconductor
• Indications of coherence-incoherence crossover in layered transport
• Boson-assisted tunneling in layered metals
• Monotonic growth of interlayer magnetoresistance in strong magnetic field in very anisotropic layered metals

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• Bilayer splitting versus Fermi-surface warping as an origin of slow oscillations of in-plane magnetoresistance in rare-earth tritellurides
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• Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition
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• Magnetic quantum oscillations in the charge-density-wave state of the organic metals $\alpha$-(BEDT-TTF)${}_2$MHg(SCN)${}_4$ with M = K and Tl
• Shubnikov-de Haas oscillations and electronic correlations in the layered organic metal $\kappa$-(BETS)${}_2$Mn[N(CN)${}_2$]${}_3$
• Slow in-plane magnetoresistance oscillations in multiband quasi-two-dimensional metals
• Comparative study of magnetic quantum oscillations in Hall and transverse magnetoresistance