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Więcej informacji o Pressure-induced unusual ground states in selected correlated electron systems

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Opis

Compounds containing transition metal atoms represent a class of materials that exhibit a wide variety of interesting electronic and magnetic properties. These compounds may be good insulators, semiconductors, or metals. Many of them display a metal-insulator transition (MIT), by varying the carrier concentration, temperature, magnetic field, and internal or external pressure. Known examples of the unique phenomena observed in these systems are, e.g., colossal magnetoresistance or even high temperature superconductivity. The rich diversity of the ground state properties of these compounds originates from the interplay between microscopic degrees of freedom of the electronic system (charge, orbital, and spin) and their coupling to the lattice. In this respect, external pressure can be used to tune such an interplay/competition between these degrees of freedom by changing the lattice parameters of the system. This leads to a change of effective bandwidth (hopping) and, thereby, to a modification of the relevant exchange interactions of a specific system. As a result, the electronic and magnetic states become unstable and in some cases phase transitions can be expected, e.g. metal insulator transition, magnetic to nonmagnetic phase transition (i. e. quantum phase transition (QPT)), or even unconventional superconductivity. Thus, the investigation of such pressure-induced phase transitions is a proper approach for a deeper understanding of the nature of electron correlations and the associated unusual ground states in this class of materials. Moreover, such investigations provide a critical test of related theoretical models describing the ground state properties of the systems. It is, thus, the aim of the present thesis to investigate the effect of pressure on the electronic, magnetic and structural properties of selected correlated compounds TiOCl, Fe1-xCoxSi (x =0, 0.1, 0.2), and SnO which represents a nonmagnetic parent compound to the recently discovered FeAs high temperature superconductors.

Szczegóły książki

• Pełny tytuł: Pressure-induced unusual ground states in selected correlated electron systems
• Autor: Martin K Forthaus
• Język: Angielski
• Oprawa: Miękka
• Liczba stron: 166
• EAN: 9783832292973
• ISBN: 3832292977
• ID: 12695340
• Wydawca: Shaker Verlag
• Waga: 231 g
• Wymiary: 211 × 149 × 4 mm
• Data wydania: 06. September 2010

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