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Giant and anisotropic magnetoresistances in p-type Bi-doped Sb 2Te 3 bulk single crystals

Journal Article


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Abstract


  • Antimony telluride (Sb 2Te 3) compounds are well known as excellent thermoelectric materials and have been recently confirmed as three-dimensional topological insulators. In this letter, we have investigated the anisotropic magneto-transport properties of p-type Bi-doped Sb 2Te 3 bulk single crystals over a broad range of temperatures, degrees and magnetic fields. Giant magnetoresistance (MR) of up to 230% was observed, which exhibits quadratic field dependences in low fields and becomes linear at high fields without any trend towards saturation. The giant MR also shows strong anisotropy with anisotropy ratio up to 210% in angle-dependent measurements. The giant MR might result from strong intervalley and intravalley scattering of holes and the strong anisotropy is attributable to the anisotropy of hole mobility, relaxation time and effective mass in the Fermi surface. The observed giant anisotropic MR could find applications in Sb 2Te 3-based anisotropic magneto-electronic devices. © Copyright EPLA, 2012.

Publication Date


  • 2012

Citation


  • Yue, Z. J., Wang, X., Du, Y., Mahboobeh, S. M., Yun, F. F., Cheng, Z. & Dou, S. X. (2012). Giant and anisotropic magnetoresistances in p-type Bi-doped Sb 2Te 3 bulk single crystals. Europhysics Letters: a letters journal exploring the frontiers of physics, 100 (1), 17014-p1-17014-p5.

Scopus Eid


  • 2-s2.0-84867770747

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8209&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5277

Has Global Citation Frequency


Start Page


  • 17014-p1

End Page


  • 17014-p5

Volume


  • 100

Issue


  • 1

Place Of Publication


  • France

Abstract


  • Antimony telluride (Sb 2Te 3) compounds are well known as excellent thermoelectric materials and have been recently confirmed as three-dimensional topological insulators. In this letter, we have investigated the anisotropic magneto-transport properties of p-type Bi-doped Sb 2Te 3 bulk single crystals over a broad range of temperatures, degrees and magnetic fields. Giant magnetoresistance (MR) of up to 230% was observed, which exhibits quadratic field dependences in low fields and becomes linear at high fields without any trend towards saturation. The giant MR also shows strong anisotropy with anisotropy ratio up to 210% in angle-dependent measurements. The giant MR might result from strong intervalley and intravalley scattering of holes and the strong anisotropy is attributable to the anisotropy of hole mobility, relaxation time and effective mass in the Fermi surface. The observed giant anisotropic MR could find applications in Sb 2Te 3-based anisotropic magneto-electronic devices. © Copyright EPLA, 2012.

Publication Date


  • 2012

Citation


  • Yue, Z. J., Wang, X., Du, Y., Mahboobeh, S. M., Yun, F. F., Cheng, Z. & Dou, S. X. (2012). Giant and anisotropic magnetoresistances in p-type Bi-doped Sb 2Te 3 bulk single crystals. Europhysics Letters: a letters journal exploring the frontiers of physics, 100 (1), 17014-p1-17014-p5.

Scopus Eid


  • 2-s2.0-84867770747

Ro Full-text Url


  • http://ro.uow.edu.au/cgi/viewcontent.cgi?article=8209&context=engpapers

Ro Metadata Url


  • http://ro.uow.edu.au/engpapers/5277

Has Global Citation Frequency


Start Page


  • 17014-p1

End Page


  • 17014-p5

Volume


  • 100

Issue


  • 1

Place Of Publication


  • France