The Magnetothermopower of Single Crystal Indium
It has been previously shown that the application of a magnetic field produces large changes in the thermopower Sa of In and Al (as well as other metals) at temperatures of order θD/10, and initial attempts to explain these results have not been completely successful. By measuring a sufficient number of transverse magnetotransport properties, six being the minimum, it is possible to isolate the contributions of the two components of the thermoelectric tensor ε″, i.e. ε″xx and ε″yx, to the magnetothermopower. We have used this approach to investigate the origin of the magnetothermopower of a high purity In single crystal with fields of 0–2T parallel to the tetrad axis, at temperatures of 2.5–8 K. For fields greater than a few hundred gauss, we find that the magnetothermopower is basically due to ε″yx, and in fact for most temperatures and fields Sa ≃ ρyxε″yx where ρyx is the Hall resistivity. This result enables us to prove that phonon drag is mainly responsible for the observed effects at these intermediate temperatures.
KeywordsDebye Temperature Open Orbit Hall Resistivity Phonon Drag Residual Resistivity Ratio
Unable to display preview. Download preview PDF.
- 1.For a survey, see F.J. Blatt, P.A. Schroeder, C.L. Foiles and D. Greig, Thermoelectric Power of Metals ( Plenum Press, New York, 1976 ), p. 217.Google Scholar
- 3.R. Fletcher, J.L. Opsal and B.J. Thaler, J. Phys. F (in press).Google Scholar
- 4.I.M. Lifshitz, M. Azabel and M.I. Kaganov, Zh. Eksp. Teor. Fiz 31, 63 (1956)Google Scholar
- I.M. Lifshitz, M. Azabel and M.I. Kaganov, Sov. Phys. JETP 4, 41 (1957).Google Scholar
- 5.M. Azabel, M.I. Kaganov and I.M. Lifshitz, Zh. Eksp. Teor. Fiz. 32, 1188 (1957)Google Scholar
- M. Azabel, M.I. Kaganov and I.M. Lifshitz, Sov. Phys. JETP 5, 967 (1957).Google Scholar
- 6.A.D. Caplin, C.K. Chiang, J. Tracy and P.A. Schroeder, Phys. Stat. Sol. 26A, 497 (1974).Google Scholar
- 8.J.L. Opsal, J. Phys. F (in press).Google Scholar
- 10.The Corbino disc geometry refers to a sample in the form of a disc with radial current flow. The field t is normal to the disc.Google Scholar