We present measurements of the low-field Hall constant RH as a function of field and temperature in the linear-chain metal NbSe3, The data range from 2 K to 200 K in temperature and up to 15 kG in field. At the two phase transitions T1 (142 K) and T2 (58 K) RH shows an abrupt increase in magnitude but no change in sign. Below 30 K RH becomes strongly field dependent. The zero-field-limit RH changes from n-type to p-type at 15 K. It is argued that the results are consistent with a two-band model in which the difference in population p - n is equal to 3 × 1018 cm-3 below T2. The hall data are also consistent with a model in which both a loss of carriers and a drastic change in the conductivity anisotropy occur at T1 and T2 and lend support to the charge-density-wave hypothesis which has been used to characterize the two transitions.
All Science Journal Classification (ASJC) codes
- Condensed Matter Physics
- Materials Chemistry