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. https://resolver.caltech.edu/CaltechAUTHORS:20140815-144158820
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Abstract
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.
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| 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 | |||||||||
| DOI: | 10.1103/PhysRevB.81.195203 | |||||||||
| Record Number: | CaltechAUTHORS:20140815-144158820 | |||||||||
| Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20140815-144158820 | |||||||||
| Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
| ID Code: | 48630 | |||||||||
| Collection: | CaltechAUTHORS | |||||||||
| Deposited By: | Joy Painter | |||||||||
| Deposited On: | 19 Aug 2014 22:59 | |||||||||
| Last Modified: | 10 Nov 2021 18:33 |
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