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Development of ferromagnetism in the doped topological insulator Bi_(2−x)Mn_xTe_3

Hor, Y. S. and Roushan, P. and Beidenhopf, H. and Seo, J. and Qu, D. and Checkelsky, J. G. and Wray, L. A. and Hsieh, D. and Xia, Y. and Xu, S.-Y. and Qian, D. and Hasan, M. Z. and Ong, N. P. and Yazdani, A. and Cava, R. J. (2010) Development of ferromagnetism in the doped topological insulator Bi_(2−x)Mn_xTe_3. Physical Review B, 81 (19). Art. No. 195203. ISSN 1098-0121. doi:10.1103/PhysRevB.81.195203.

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The development of ferromagnetism in Mn-doped Bi_2Te_3 is characterized through measurements on a series of single crystals with different Mn content. Scanning tunneling microscopy analysis shows that the Mn substitutes on the Bi sites, forming compounds of the type Bi_(2−x)Mn_xTe_3, and that the Mn substitutions are randomly distributed, not clustered. Mn doping first gives rise to local magnetic moments with Curie-like behavior, but by the compositions Bi_(1.96)Mn_(0.04)Te_3 and Bi_(1.91)Mn_(0.09)Te_3, a second-order ferromagnetic transition is observed, with T_C∼9–12 K. The easy axis of magnetization in the ferromagnetic phase is perpendicular to the Bi2Te3 basal plane. Thermoelectric power and Hall effect measurements show that the Mn-doped Bi_2Te_3 crystals are p-type. Angle-resolved photoemission spectroscopy measurements show that the topological surface states that are present in pristine Bi_2Te_3 are also present at 15 K in ferromagnetic Mn-doped Bi2−xMnxTe3 and that the dispersion relations of the surface states are changed in a subtle fashion.

Item Type:Article
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Seo, J.0000-0002-0442-288X
Hsieh, D.0000-0002-0812-955X
Additional Information:© 2010 The American Physical Society. Received 26 January 2010; published 6 May 2010. This research was supported by the NSF MRSEC program Grant No. DMR-0819860. P.R. and D.Q. acknowledge NSF graduate foundation. We thank M. M. Bandi for fruitful discussions.
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Issue or Number:19
Classification Code:PACS number s : 75.50.Pp, 73.20.At, 71.20.Nr
Record Number:CaltechAUTHORS:20140815-144158820
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:48630
Deposited By: Joy Painter
Deposited On:19 Aug 2014 22:59
Last Modified:10 Nov 2021 18:33

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