Decrease of Itinerant Holes near the Metal to Insulator Crossover in Superconducting La<sub><b>1.85</b></sub>Sr<sub><b>0.15</b></sub>CuO<sub><b>4</b></sub>
N. L. SainiDipartimento di Fisica, Universita' di Roma “La Sapienza”, P. A. Moro 2, 00185 Roma, ItalyAlessandra LanzaraDipartimento di Fisica, Universita' di Roma “La Sapienza”, P. A. Moro 2, 00185 Roma, ItalyA. BianconiDipartimento di Fisica, Universita' di Roma “La Sapienza”, P. A. Moro 2, 00185 Roma, ItalyD. LawRUSTI Daresbury Laboratory, Warrington, Cheshire WA4 4AD, U.KA.A. MenovskyVan der Waals Zeeman Lab, Universiteit van Amsterdam, Valckenierstraat 65, 1018XE Amsterdam, The NetherlandsKrishna B. GargDepartment of Physics, University of Rajasthan, Jaipur-302004, IndiaH. ŌyanagiElectrotechnical Laboratory, Umezono 1-1-4 Tsukuba, Ibaraki 305
1998en
ABI
Annotatsiya
Polarized Cu L-edge X-ray absorption spectra (XAS) measurements of the unoccupied electronic state of 3d(x)2-(y)2 symmetry in superconducting La1.85Sr0.15CuO4 Single crystals show a temperature dependent anomalous decrease of the density of itinerant holes below similar to 100 K. The anomalous temperature coincides with the temperature of the metal to insulator (MI) transition and local lattice distortions in the CuO2 plane. The results give direct evidence of decrease of itinerant states in the CuO2 plane due to local lattice distortions across the MI crossover in the normal state.
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