TY - JOUR
T1 - Evidence for transition of Fermi-surface topology in highly doped Na xCoO2
AU - Arakane, T.
AU - Sato, T.
AU - Takahashi, T.
AU - Fujii, T.
AU - Asamitsu, A.
PY - 2010/3/22
Y1 - 2010/3/22
N2 - We have performed angle-resolved photoemission spectroscopy of Na xCoO2 (x=0.65 and 0.77) to clarify the origin of antiferromagnetic (AF) transition. We determined the electronic band structure along the out-of-plane direction by varying photon energy, and revealed that a three-dimensional electron pocket emerges at Γ point in the AF sample (x=0.77) while it is absent in the non-AF counterpart (x=0.65), showing the transition of Fermi-surface topology with the band filling. The present result suggests that the emergence of the electron pocket is closely related to the various anomalies of the physical properties in Na-rich cobaltates.
AB - We have performed angle-resolved photoemission spectroscopy of Na xCoO2 (x=0.65 and 0.77) to clarify the origin of antiferromagnetic (AF) transition. We determined the electronic band structure along the out-of-plane direction by varying photon energy, and revealed that a three-dimensional electron pocket emerges at Γ point in the AF sample (x=0.77) while it is absent in the non-AF counterpart (x=0.65), showing the transition of Fermi-surface topology with the band filling. The present result suggests that the emergence of the electron pocket is closely related to the various anomalies of the physical properties in Na-rich cobaltates.
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U2 - 10.1103/PhysRevB.81.115132
DO - 10.1103/PhysRevB.81.115132
M3 - Article
AN - SCOPUS:77954963940
VL - 81
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
SN - 0163-1829
IS - 11
M1 - 115132
ER -