期刊
PHYSICAL REVIEW B
卷 80, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.214411
关键词
Debye temperature; doping; electron correlations; electronic structure; Hall effect; lanthanum compounds; metal-insulator transition; percolation; phase separation; specific heat; strongly correlated electron systems; strontium
资金
- DOE [DE-FG02-06ER46275]
- NSF [DMR-0804432]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [0804432, 0754792] Funding Source: National Science Foundation
We present a detailed investigation of the specific heat (0.35 < T < 270 K) and ordinary Hall effect (300 K) in La1-xSrxCoO3 single crystals at 11 doping values in the range 0.00 < x < 0.30. The data reveal a considerable amount of information on the nature of the percolation transition, the crystal and electronic structures, and, most significantly, the magnetoelectronic phase inhomogeneity that has attracted such attention in this material. The observations include a discontinuity in Debye temperature accompanying the insulator-metal transition, direct evidence for the percolative nature of this transition, and a large electron mass enhancement in the metallic state, likely due to strong electron correlation effects. The various contributions to the heat capacity are shown to provide a detailed picture of the phase-separated state and its evolution with doping and are discussed in light of prior neutron-scattering and heat capacity data. This doping dependence provides strong evidence that the phase separation is restricted to a well-defined doping range, 0.04 < x < 0.22, in agreement with a recently proposed model.
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