TY - JOUR
T1 - 4f-derived fermi surfaces of CeRu2(Si1-xGex)2 near the quantum critical point
T2 - Resonant soft-X-ray ARPES study
AU - Okane, T.
AU - Ohkochi, T.
AU - Takeda, Y.
AU - Fujimori, S. I.
AU - Yasui, A.
AU - Saitoh, Y.
AU - Yamagami, H.
AU - Fujimori, A.
AU - Matsumoto, Y.
AU - Sugi, M.
AU - Kimura, N.
AU - Komatsubara, T.
AU - Aoki, H.
PY - 2009/5/26
Y1 - 2009/5/26
N2 - Angle-resolved photoelectron spectroscopy in the Ce 3d→4f excitation region was measured for the paramagnetic state of CeRu2Si2, CeRu2(Si0.82Ge0.18) 2, and LaRu2Si2 to investigate the changes of the 4f electron Fermi surfaces around the quantum critical point. While the difference of the Fermi surfaces between CeRu2Si2 and LaRu2Si2 was experimentally confirmed, a strong 4f-electron character was observed in the band structures and the Fermi surfaces of CeRu2Si2 and CeRu2(Si0.82Ge0.18)2, consequently indicating a delocalized nature of the 4f electrons in both compounds. The absence of Fermi surface reconstruction across the critical composition suggests that SDW quantum criticality is more appropriate than local quantum criticality in CeRu2(Si1-xGex)2.
AB - Angle-resolved photoelectron spectroscopy in the Ce 3d→4f excitation region was measured for the paramagnetic state of CeRu2Si2, CeRu2(Si0.82Ge0.18) 2, and LaRu2Si2 to investigate the changes of the 4f electron Fermi surfaces around the quantum critical point. While the difference of the Fermi surfaces between CeRu2Si2 and LaRu2Si2 was experimentally confirmed, a strong 4f-electron character was observed in the band structures and the Fermi surfaces of CeRu2Si2 and CeRu2(Si0.82Ge0.18)2, consequently indicating a delocalized nature of the 4f electrons in both compounds. The absence of Fermi surface reconstruction across the critical composition suggests that SDW quantum criticality is more appropriate than local quantum criticality in CeRu2(Si1-xGex)2.
UR - http://www.scopus.com/inward/record.url?scp=66349093362&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.102.216401
DO - 10.1103/PhysRevLett.102.216401
M3 - 学術論文
C2 - 19519117
AN - SCOPUS:66349093362
SN - 0031-9007
VL - 102
JO - Physical Review Letters
JF - Physical Review Letters
IS - 21
M1 - 216401
ER -