期刊
PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
卷 469, 期 9-12, 页码 448-451出版社
ELSEVIER
DOI: 10.1016/j.physc.2009.03.043
关键词
Pnictides; Fermi surface; ARPES; Superconductivity
资金
- DFG [KN393/4, KN393/12, 130 1912/2-1]
Here we apply high resolution angle-resolved photoemission spectroscopy (ARPES) using a wide excitation energy range to probe the electronic structure and the Fermi surface topology of the Ba1-xKxFe2As2 (T-c = 32 K) superconductor. We find significant deviations in the low energy band structure from that predicted in calculations. A set of Fermi surface sheets with unexpected topology is detected at the Brillouin zone boundary. At the X-symmetry point the Fermi surface is formed by a shallow electron-like pocket surrounded by four hole-like pockets elongated in Gamma-X and Gamma-Y directions. (C) 2009 Elsevier B.V. All rights reserved.
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