Evidence for topologically protected surface states and a superconducting phase in [Tl4] (Tl1-x Snx) Te3 using photoemission, specific heat, and magnetization measurements, and density functional theory

K. E. Arpino; D. C. Wallace; Y. F. Nie; T. Birol; P. D.C. King; S. Chatterjee; M. Uchida; S. M. Koohpayeh; J. J. Wen; K. Page; C. J. Fennie; K. M. Shen; T. M. McQueen

doi:10.1103/PhysRevLett.112.017002

Evidence for topologically protected surface states and a superconducting phase in [Tl₄] (Tl_1-x Sn_x) Te₃ using photoemission, specific heat, and magnetization measurements, and density functional theory

K. E. Arpino, D. C. Wallace, Y. F. Nie, T. Birol, P. D.C. King, S. Chatterjee, M. Uchida, S. M. Koohpayeh, J. J. Wen, K. Page, C. J. Fennie, K. M. Shen, T. M. McQueen

Chemical Engineering and Materials Science

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Abstract

We report the discovery of surface states in the perovskite superconductor [Tl4]TlTe3 (Tl5Te3) and its nonsuperconducting tin-doped derivative [Tl4](Tl0.4Sn0.6)Te3 as observed by angle-resolved photoemission spectroscopy. Density functional theory calculations predict that the surface states are protected by a Z2 topology of the bulk band structure. Specific heat and magnetization measurements show that Tl5Te3 has a superconducting volume fraction in excess of 95%. Thus Tl5Te3 is an ideal material in which to study the interplay of bulk band topology and superconductivity.

Original language	English (US)
Article number	017002
Journal	Physical review letters
Volume	112
Issue number	1
DOIs	https://doi.org/10.1103/PhysRevLett.112.017002
State	Published - Jan 8 2014

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Arpino, K. E., Wallace, D. C., Nie, Y. F., Birol, T., King, P. D. C., Chatterjee, S., Uchida, M., Koohpayeh, S. M., Wen, J. J., Page, K., Fennie, C. J., Shen, K. M., & McQueen, T. M. (2014). Evidence for topologically protected surface states and a superconducting phase in [Tl₄] (Tl_1-x Sn_x) Te₃ using photoemission, specific heat, and magnetization measurements, and density functional theory. Physical review letters, 112(1), Article 017002. https://doi.org/10.1103/PhysRevLett.112.017002

Evidence for topologically protected surface states and a superconducting phase in [Tl₄] (Tl_1-x Sn_x) Te₃ using photoemission, specific heat, and magnetization measurements, and density functional theory. / Arpino, K. E.; Wallace, D. C.; Nie, Y. F. et al.
In: Physical review letters, Vol. 112, No. 1, 017002, 08.01.2014.

Research output: Contribution to journal › Article › peer-review

Arpino, KE, Wallace, DC, Nie, YF, Birol, T, King, PDC, Chatterjee, S, Uchida, M, Koohpayeh, SM, Wen, JJ, Page, K, Fennie, CJ, Shen, KM & McQueen, TM 2014, 'Evidence for topologically protected surface states and a superconducting phase in [Tl₄] (Tl_1-x Sn_x) Te₃ using photoemission, specific heat, and magnetization measurements, and density functional theory', Physical review letters, vol. 112, no. 1, 017002. https://doi.org/10.1103/PhysRevLett.112.017002

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abstract = "We report the discovery of surface states in the perovskite superconductor [Tl4]TlTe3 (Tl5Te3) and its nonsuperconducting tin-doped derivative [Tl4](Tl0.4Sn0.6)Te3 as observed by angle-resolved photoemission spectroscopy. Density functional theory calculations predict that the surface states are protected by a Z2 topology of the bulk band structure. Specific heat and magnetization measurements show that Tl5Te3 has a superconducting volume fraction in excess of 95%. Thus Tl5Te3 is an ideal material in which to study the interplay of bulk band topology and superconductivity.",

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Evidence for topologically protected surface states and a superconducting phase in [Tl₄] (Tl_1-x Sn_x) Te₃ using photoemission, specific heat, and magnetization measurements, and density functional theory

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