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By Masaki Uchida
In this thesis the writer offers the result of broad spectroscopy experiments past the limits of every transition point to elucidate the origins of attribute spectral positive factors and cost dynamics in charge-spin-orbital coupled phenomena in Mott-transition oxides. numerous counterpart 3d transition-metal oxides have been followed as version structures compatible for analyzing the mechanisms concerned, and their digital buildings have been systematically investigated utilizing 3 major spectroscopy tools.
Comparative reports at the cost dynamics and Mott transition positive aspects of transition-metal oxides have been played: cost dynamics and thermoelectricity in a customary Mott transition approach La1−xSrxVO3, cost dynamics in a doped valence-bond reliable procedure (Ti1−xVx)2O3 and in layered nickelates R2-xSrxNiO4 with charge-ordering instability are investigated completely. the implications bought effectively offer a couple of novel insights into the emergent phenomena close to the Mott transition.
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Extra resources for Spectroscopic Study on Charge-Spin-Orbital Coupled Phenomena in Mott-Transition Oxides
Sample text
1007/978-4-431-54297-1_4, © Springer Japan 2013 43 44 4 Charge Dynamics in a Doped Valence-Bond Solid System strong mass renormalization to a polaron effect which originates from the strong electron-phonon coupling on the dimer sites characteristic of the VBS system. 2 Basic Properties of (Ti1−x V x )2 O3 Ti2 O3 has an α-corundum structure. The crystal structure does not change with substituting the Ti sites with V atoms, and also V2 O3 has the same structure. 1, since there are some types of polymorphism for M2 O3 compounds.
The thermally induced insulator-metal transition in Ti2 O3 can be interpreted with band-crossing picture via the weakened singlet bond by the thermal gap excitation (Fig. 6b). In Fig.
The Gaussian fitting curves and the vertical bars for the peak positions are also plotted. Chemical potential experimentally estimated from the photoemission spectra and comparison to some model calculation values (lower panel) 40 3 Charge Dynamics and Thermoelectricity in a Typical System Δμ is obtained from the following equation. 11) Here D denotes the density of states. With increasing the temperature, the derived Δμ gradually deviates from the parabolic curve (blue dashed line) and shows the crossover to the incoherent hopping state of Co3+ /Co4+ mixed-valence.