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In order to investigate the electronic state in the normal state of high-Tccuprates in a wide range of temperature and hole-concentration, specific-heat,electrical-resistivity, magnetization and muon-spin-relaxation (muSR)measurements have been performed in non-superconducting Ni-substitutedLa2-xSrxCu1-yNiyO4 where the superconductivity is suppressed through thepartial substitution of Ni for Cu without disturbing the Cu-spin correlation inthe CuO2 plane so much. In the underdoped regime, it has been found that thereexist both weakly localized holes around Ni and itinerant holes at hightemperatures. With decreasing temperature, all holes tend to be localized,followed by the occurrence of variable-range hopping conduction at lowtemperatures. Finally, in the ground state, it has been found that each Ni2+ion traps a hole strongly and that a magnetically ordered state appears. In theoverdoped regime, on the other hand, it has been found that a Kondo-like stateis formed around each Ni2+ spin at low temperatures. In conclusion, the groundstate of non-superconducting La2-xSrxCu1-yNiyO4 changes upon hole doping from amagnetically ordered state with the strong hole-trapping by Ni2+ to a metallicstate with Kondo-like behavior due to Ni2+ spins, and the quantum phasetransition is crossover-like due to the phase separation into short-rangemagnetically ordered and metallic regions.

Hole-trapping by Ni, Kondo effect and electronic phase diagram in non-superconducting Ni-substituted La2-xSrxCu1-yNiyO4