期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 1, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.017002
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资金
- Johns Hopkins University
- David and Lucile Packard Foundation
- NSF Materials Research Science and Engineering Centers (MRSEC) program Grant [DMR-1120296]
- AFOSR [FA9550-11-1-0033, FA9550-12-1-0335]
- NSF CAREER Grant [DMR-0847385]
- Energy Materials Center at Cornell (EMC2), an Energy Frontier Research Center
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-SC0001086]
- Cornell Center for Materials Research
- NSF MRSEC program [DMR-1120296]
- DOE, Office of Science, Basic Energy Sciences, Division of Materials Sciences and Engineering (The Institute for Quantum Matter) [DE-FG02-08ER46544]
- U.S. DOE Office of Basic Energy Sciences
- DOE [DE-AC52-06NA25396]
- National Science Foundation Major Research Instrumentation Program [DMR-0821005]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0847385] Funding Source: National Science Foundation
We report the discovery of surface states in the perovskite superconductor [Tl-4]TlTe3 (Tl5Te3) and its nonsuperconducting tin-doped derivative [Tl-4](Tl0.4Sn0.6)Te-3 as observed by angle-resolved photoemission spectroscopy. Density functional theory calculations predict that the surface states are protected by a Z(2) 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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