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Magnetic-field-induced dimensional crossover in the organic metal $$\alpha$$-(BEDT-TTF)$$_{2}$$KHg(SCN)$$_{4}$$

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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.

Most cited references24

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Theory of Quantum Transport in a Two-Dimensional Electron System under Magnetic Fields. III. Many-Site Approximation

(1974)
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Temperature dependence of thec-axis resistivity of high-Tclayered oxides

(1992)
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Magnetic-field-induced transition in quasi-two-dimensional systems

(1985)
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Author and article information

Journal
30 April 2012
2012-08-20
Article
10.1103/PhysRevB.86.165125
1205.0041

Phys. Rev. B 86, 165125 (2012)
7 pages, 5 figures
cond-mat.mes-hall cond-mat.other

Condensed matter, Nanophysics