Galvanomagnetic Effects in the Charge-Density-Wave State of 2H-NbSe2 and 2H-TaSe2

The magnetoresistance and Hall coefficient in the charge-density-wave (CDW) state of 2 H -NbSe 2 and 2 H -TaSe 2 have been measured at low temperatures in magnetic fields up to 150 kOe, using high-quality single crystals. The results on these two compounds have been compared with those on 2 H -NbS 2 which has no CDW transition. By the comparison, several anomalous features in the CDW systems (2 H -NbSe 2 and -TaSe 2 ) have been made clear: 1) The magnetoresistance is relatively large and exhibits a linear dependence on magnetic field. 2) The Hall coefficient shows a strong field dependence including a minimum. We consider that the observed behaviors in the CDW systems may be explained by reconstruction of the Fermi surface in the CDW state and magnetic breakdown through the CDW gaps,

[1]  Shoji Tanaka,et al.  Electrical Transport Properties in 2H-NbS2, -NbSe2, -TaS2 and -TaSe2 , 1982 .

[2]  S. Tanaka,et al.  Possibility of the Magnetic Breakdown for 2H-MX2 in High Field , 1981 .

[3]  N. Lewis,et al.  Magnetoresistance of 2H-NbSe 2 , 1978 .

[4]  M. Suzuki,et al.  The Static Skin Effect in Bismuth. I , 1978 .

[5]  H. Shanks,et al.  Superconducting- and normal-state thermal conductivity of NbSe2 , 1977 .

[6]  F. Disalvo,et al.  Neutron scattering study of the charge-density wave transitions in 2 H − Ta Se 2 and 2 H − Nb Se 2 , 1977 .

[7]  R. V. Coleman,et al.  Oscillatory magnetotransport in the layer compounds 4Hb-TaS/sub 2/ and 2H-TaSe/sub 2/ , 1977 .

[8]  J. Wilson.  Charge-density waves in the 2H-TaSe 2 family: Action on the Fermi surface , 1977 .

[9]  J. Graebner.  Fermi surface measurements in 2H-TaSe2 , 1977 .

[10]  G. Wexler,et al.  Fermi surfaces and band structures of the 2H metallic transition-metal dichalcogenides , 1976 .

[11]  J. C. Garland,et al.  HIGH-FIELD GALVANOMAGNETIC PROPERTIES OF INDIUM. , 1969 .

[12]  R. A. Young.  Influence of Localized Umklapp Scattering on the Galvanomagnetic Properties of Metals , 1968 .

[13]  A. Pippard.  The influence of small-angle scattering on metallic conduction , 1968, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[14]  M. Zuckermann,et al.  Magnetic Breakdown, Fermi Surface, and Galvanomagnetic Properties in Antiferromagnetic Metals , 1967 .

[15]  A. Pippard,et al.  Theory of the Galvanomagnetic Properties of Magnesium and Zinc , 1966 .

[16]  A. Pippard.  Magnetic Breakdown in a dislocated lattice , 1965, Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences.

[17]  P. Sievert,et al.  Theory of the Galvanomagnetic Effects in Metals with Magnetic Breakdown: Semiclassical Approach , 1965 .

[18]  E. Fawcett.  High-field galvanomagnetic properties of metals , 1964 .

[19]  C. Herring.  Effect of Random Inhomogeneities on Electrical and Galvanomagnetic Measurements , 1960 .