Anisotropies in the Magnetotransport Properties of Quai-Two-Dimensional η-Mo_4O_<11> Crystals

概要

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lVIagnetotransport measureraaents hatve lceen urn?tde f'or' qu;tsi-txvo-dimernsional j-llx4o.j 011 crystalsin its charge-density-wave (CDW) phatses along the crystallogr?tphic a"-, b-, and C-2lXCS at lowteraaperatures 0.3 -4.2K in magnetic fields Lip to IIT. The diagonal couaaponents p.. (or b-axis), p.. (c-axis), and p.. (a'-axis) of' the resistivity tensor ;tre highly atnisotropic (p..<p.. ( p..; p../p.. x 10'). Counputer sinaulations f'or the na?tgnetic field dependence of p..,p.., and p.. are tnade tmsing 21 rnulticarrier rnodel, in good agreetnent with the observations.From the in-platte anisotropy, we h?rve estirnated the auuisotr'opic shape of the Fermi surfaces.These anisotropic properties are disctrssed by cornsidering the ch?tracteristic crystal structtrreand conduction process vi?t condtrcting and insttlating layers along the z-axis. Furthertnore, inview of the existing band tnodel of' this raaaterial and the dstt?t analyses, the observed quanttttnoscillations are not siraaply due to Shubnikov de-Baas oscillatiorrs but to some rnagnetic-fieldinduced phase transition, as found f'or low-dirnensionsrl organic Bechgaar'd salts, the essence ofwhich is the presence of laidden qtrasi-one-dirnensional Fermi strrf'ace.
社団法人日本物理学会の論文
1999-02-15