Temperature and Angular Dependence of the Magnetoresistance in Low Dimensional Organic Metals

Details Temperature and Angular Dependence of the Magnetoresistance in Low Dimensional Organic Metals Temperature and Angular Dependence of the Magnetoresistance in Low Dimensional Organic Metals

2000-05-12

arxiv.org/abs/cond-mat/0005202v1

Physics

Condensed Matter

17 pages, 7 figures, shown at the APS march meeting 1999, appears in the Ph.D. thesis of J. S. Qualls (Florida State Universit

Scientific paper

Detailed studies of the magnetoresistance of alpha-(ET)2KHg(SCN)4 and alpha-(ET)2TlHg(SCN)4 as a function of temperature, magnetic field strength, and field orientation are reported. Below 15 K, the temperature dependence of the magnetoresistance is metallic (dR/dT > 0) for magnetic field orientation corresponding to an angular dependent magnetoresistance oscillation (AMRO) minimum and nonmetallic (dR/dT < 0) at all other field orientations. We find that this behavior can be explained in terms of semiclassical models without the use of a non-Fermi liquid description. The alternating temperature dependence (metallic/nonmetallic)with respect to field orientation is common to any system with either quasi-one or two-dimensional AMRO. Furthermore, we report a new metallic property of the high field and low temperature regime of alpha-(ET)2MHg(SCN)4 (where M = K, Rb, or Tl) compounds.

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