Anisotropic Seebeck and magneto-Seebeck coefficients of Bi and Bi0.92Sb0.08 alloy thin films

Sunglae Cho*, Yunki Kim, Antonio DiVenere, George K.L. Wong, John B. Ketterson, Jerry R. Meyer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations

Abstract

We have grown Bi and BiSb alloy thin films on (211)CdTe substrates by molecular beam epitaxy. Growth proceeds with the Bi or BiSb (00.1) axis oriented along the CdTe[111] direction, which is tilted by 19o with respect to the substrate normal. Measurements of the Seebeck coefficient reveal a strong dependence on angle within the plane, due to the anisotropic electronic structure. The coefficient measured along the [1̄11] axis, which includes a trigonal contribution from the Seebeck tensor, is considerably higher than the value along the [011̄] axis. The magneto-Seebeck coefficient was also studied, for magnetic fields of 0-0.7 T. We observe a strong dependence on both crystal-axis and magnetic field direction, the so-called "umkehr" effect.

Original languageEnglish (US)
Pages (from-to)808-812
Number of pages5
JournalJournal of Applied Physics
Volume88
Issue number2
DOIs
StatePublished - Jul 15 2000

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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