Doping-dependent Evolution of the Electronic Structure of La2-xSrxCuO4 in the Superconducting and Metallic Phases
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...Careful investigations by Ino et al. (2002) indicated that the Fermi surface changes from holelike to electronlike for x.0.15–0.2 as the saddle point moves from below to above EF , consistent with LDA calculations....
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...Detailed angle-resolved investigations of the pseudogap in LSCO were recently reported by Ino et al. (2002) and Yoshida (2001)....
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...For x,0.2 along with the opening of the pseudogap, one observes a suppression of the electronic specific heat and a decrease of the effective mass (Ino et al., 1998, 2002)....
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...In contrast with the case of LSCO, where a crossover from a holelike to an electronlike Fermi surface is observed near optimal doping (Ino et al., 1999, 2002), Ding et al. (1997) suggested that a single holelike sheet of Fermi surface is characteristic of all the studied doping levels....
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...…and La22xSrxCuO4 in some cases do exhibit features with a well-defined dispersion, and when one looks at the spectral intensity integrated over a small energy window about the Fermi energy, a Fermi surface of sorts is observed (Dessau et al., 1993; Ding et al., 1996; Ino et al., 2002)....
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...However, its variation with doping is opposite to that of Qch (Ding et al., 1997; Ino et al., 2002); with increasing x , the holelike Fermi surface approaches closer to the (p,0) point, so the spanning wave vector decreases, while Qch increases....
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