TY - JOUR
T1 - Observation of anomalous temperature dependence of spectrum on small Fermi surfaces in a BiS2 -based superconductor
AU - Zeng, L. K.
AU - Wang, X. B.
AU - Ma, J.
AU - Richard, P.
AU - Nie, S. M.
AU - Weng, H. M.
AU - Wang, N. L.
AU - Wang, Z.
AU - Qian, T.
AU - Ding, H.
N1 - Publication details (e.g. title, author(s), publication statuses and dates) are captured on an “AS IS” and “AS AVAILABLE” basis at the time of record harvesting from the data source. Suggestions for further amendments or supplementary information can be sent to [email protected].
PY - 2014/8/20
Y1 - 2014/8/20
N2 - We have performed an angle-resolved photoemission spectroscopy study of the BiS2-based superconductor Nd(O,F)BiS2. Two small electronlike Fermi surfaces around X(π,0) are observed, which enclose 2.4% and 1.1% of the Brillouin zone area, respectively, corresponding to an electron doping of 7% per Bi site. The Fermi surface topology is far from the nesting scenario proposed in most of the theoretical models for the BiS2-based superconductors. The conduction bands show significant anisotropic splitting along XM and ΓX, which is attributed to the cooperative effects of large spin-orbit coupling and interlayer coupling. The low-energy spectrum exhibits a weakly dispersing broad hump near the bottom of the conduction bands. This hump is drastically suppressed with increasing temperature, while the spectral weight at the Fermi level is essentially unaffected. These anomalous spectral features indicate that the electrons could be strongly coupled with the lattice in the low-temperature normal state of this superconductor. © 2014 American Physical Society.
AB - We have performed an angle-resolved photoemission spectroscopy study of the BiS2-based superconductor Nd(O,F)BiS2. Two small electronlike Fermi surfaces around X(π,0) are observed, which enclose 2.4% and 1.1% of the Brillouin zone area, respectively, corresponding to an electron doping of 7% per Bi site. The Fermi surface topology is far from the nesting scenario proposed in most of the theoretical models for the BiS2-based superconductors. The conduction bands show significant anisotropic splitting along XM and ΓX, which is attributed to the cooperative effects of large spin-orbit coupling and interlayer coupling. The low-energy spectrum exhibits a weakly dispersing broad hump near the bottom of the conduction bands. This hump is drastically suppressed with increasing temperature, while the spectral weight at the Fermi level is essentially unaffected. These anomalous spectral features indicate that the electrons could be strongly coupled with the lattice in the low-temperature normal state of this superconductor. © 2014 American Physical Society.
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U2 - 10.1103/PhysRevB.90.054512
DO - 10.1103/PhysRevB.90.054512
M3 - RGC 21 - Publication in refereed journal
SN - 1098-0121
VL - 90
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 5
M1 - 054512
ER -