TY - JOUR
T1 - Fermi surface in La-based cuprate superconductors from Compton scattering imaging
AU - Yamase, Hiroyuki
AU - Sakurai, Yoshiharu
AU - Fujita, Masaki
AU - Wakimoto, Shuichi
AU - Yamada, Kazuyoshi
N1 - Funding Information:
The authors thank M. Ito for technical supports of Compton scattering measurements and A. Fujimori, W. Metzner, M. Ogata, and H. Yokoyama for valuable discussions on the interpretation of the present Compton scattering data. H.Y. was supported by a Grant-in-Aid for Scientific Research Grant Number JP15K05189, JP18K18744, JP20H01856, and by JST-Mirai Program Grant Number JPMJMI18A3, Japan. The Compton scattering experiment was performed with the approval of JASRI (proposal no. 2012B1198).
Publisher Copyright:
© 2021, The Author(s).
PY - 2021/12/1
Y1 - 2021/12/1
N2 - Compton scattering provides invaluable information on the underlying Fermi surface (FS) and is a powerful tool complementary to angle-resolved photoemission spectroscopy and quantum oscillation measurements. Here we perform high-resolution Compton scattering measurements for La2−xSrxCuO4 with x = 0.08 (Tc = 20 K) at 300 K and 150 K, and image the momentum distribution function in the two-dimensional Brillouin zone. We find that the observed images cannot be reconciled with the conventional hole-like FS believed so far. Instead, our data imply that the FS is strongly deformed by the underlying nematicity in each CuO2 plane, but the bulk FSs recover the fourfold symmetry. We also find an unusually strong temperature dependence of the momentum distribution function, which may originate from the pseudogap formation in the presence of the reconstructed FSs due to the underlying nematicity. Additional measurements for x = 0.15 and 0.30 at 300 K suggest similar FS deformation with weaker nematicity, which nearly vanishes at x = 0.30.
AB - Compton scattering provides invaluable information on the underlying Fermi surface (FS) and is a powerful tool complementary to angle-resolved photoemission spectroscopy and quantum oscillation measurements. Here we perform high-resolution Compton scattering measurements for La2−xSrxCuO4 with x = 0.08 (Tc = 20 K) at 300 K and 150 K, and image the momentum distribution function in the two-dimensional Brillouin zone. We find that the observed images cannot be reconciled with the conventional hole-like FS believed so far. Instead, our data imply that the FS is strongly deformed by the underlying nematicity in each CuO2 plane, but the bulk FSs recover the fourfold symmetry. We also find an unusually strong temperature dependence of the momentum distribution function, which may originate from the pseudogap formation in the presence of the reconstructed FSs due to the underlying nematicity. Additional measurements for x = 0.15 and 0.30 at 300 K suggest similar FS deformation with weaker nematicity, which nearly vanishes at x = 0.30.
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U2 - 10.1038/s41467-021-22229-6
DO - 10.1038/s41467-021-22229-6
M3 - Article
C2 - 33850119
AN - SCOPUS:85104280267
SN - 2041-1723
VL - 12
JO - Nature Communications
JF - Nature Communications
IS - 1
M1 - 2223
ER -