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Physics of Spin-Orbit-Coupled Oxides

2021 Science
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Release : 2021
Genre : Science
Kind : eBook
Book Rating : 026/5 ( reviews)

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Book Synopsis Physics of Spin-Orbit-Coupled Oxides by : Gang Cao

Download or read book Physics of Spin-Orbit-Coupled Oxides written by Gang Cao. This book was released on 2021. Available in PDF, EPUB and Kindle. Book excerpt: This book is aimed at graduate students, post docs and senior researchers with preliminary expertise in materials physics or chemistry, and with an interest in the physical and chemical properties of 4d- and 5d transition metal oxides, especially ruthenates and iridates. The 4d- and 5d-transition metal oxides are among the most current and interesting quantum materials. This book reviews recent experimental and theoretical evidence that the physical and structural properties of these materials are decisively influenced by strong spin-orbit interactions that compete with comparable Coulomb, magnetic exchange and crystalline electric field interactions. This competition often leads to unusual ground states and magnetic frustration that are unique to this class of materials. Novel coupling between the orbital/lattice and spin degrees of freedom, which seriously challenge current theoretical models and are not addressed by traditional textbooks, are of particular interest, This book also reviews a few techniques for single-crystal growth that are most suitable for the 4d- and 5d-transition metal oxides. The discussion is intended to help fill an existing void in the literature describing relevant synthesis techniques for 4d- and 5d-materials, which is a daunting experimental challenge.

Spin-orbital Physics in Transition Metal Oxides

2004
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Release : 2004
Genre :
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Book Synopsis Spin-orbital Physics in Transition Metal Oxides by :

Download or read book Spin-orbital Physics in Transition Metal Oxides written by . This book was released on 2004. Available in PDF, EPUB and Kindle. Book excerpt: Many body aspect of interplay between spin degrees of freedom and orbital degrees of freedom in transition metal oxides is studied. In this thesis work, I study three major research projects. First, I study SU(2) Heisenberg spin models and discuss some pathologies associated with the Schwinger boson mean field theory for the SU(N) Heisenberg models in which orbital degrees of freedom can be included as an internal symmetry. Second, considering the key parameters realized in the system, I derive an effective superexchange spin-orbital Hamiltonian for the $YVO3̲$ system and use mean field theory to explain the observed high temperature orbital transition and spin transitions. Third, I study the newly proposed spin-2 bond model for insulating $V2̲O3̲$ system. I use Bogolyubov-Peirels variational approach to study the effects of quantum fluctuation and short range spin correlations on magnetic phase transitions. Then, I explin observed large entropy jump and the other experimental observations in the system. Interestingly, with the model of $V2̲O3̲$, I find a novel mechanism for spin ordering and disordering transitions due dimensional crossover and dimensional reduction induced by orbital ordering.

Frontiers of 4D- and 5D-transition Metal Oxides

2013 Science
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Release : 2013
Genre : Science
Kind : eBook
Book Rating : 865/5 ( reviews)

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Book Synopsis Frontiers of 4D- and 5D-transition Metal Oxides by : Gang Cao

Download or read book Frontiers of 4D- and 5D-transition Metal Oxides written by Gang Cao. This book was released on 2013. Available in PDF, EPUB and Kindle. Book excerpt: This book is aimed at advanced undergraduates, graduate students and other researchers who possess an introductory background in materials physics and/or chemistry, and an interest in the physical and chemical properties of novel materials, especially transition metal oxides.New materials often exhibit novel phenomena of great fundamental and technological importance. Contributing authors review the structural, physical and chemical properties of notable 4d- and 5d-transition metal oxides discovered over the last 10 years. These materials exhibit extraordinary physical properties that differ significantly from those of the heavily studied 3d-transition metal oxides, mainly due to the relatively strong influence of the spin-orbit interaction and orbital order in 4d- and 5d materials. The immense growth in publications addressing the physical properties of these novel materials underlines the need to document recent advances and the current state of this field. This book includes overviews of the current experimental situation concerning these materials.

Spectroscopic Study on Charge-Spin-Orbital Coupled Phenomena in Mott-Transition Oxides

2013-02-02 Technology & Engineering
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Release : 2013-02-02
Genre : Technology & Engineering
Kind : eBook
Book Rating : 973/5 ( reviews)

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Book Synopsis Spectroscopic Study on Charge-Spin-Orbital Coupled Phenomena in Mott-Transition Oxides by : Masaki Uchida

Download or read book Spectroscopic Study on Charge-Spin-Orbital Coupled Phenomena in Mott-Transition Oxides written by Masaki Uchida. This book was released on 2013-02-02. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis the author presents the results of extensive spectroscopy experiments beyond the bounds of each transition element to clarify the origins of characteristic spectral features and charge dynamics in charge-spin-orbital coupled phenomena in Mott-transition oxides. Several counterpart 3d transition-metal oxides were adopted as model systems suitable for examining the mechanisms involved, and their electronic structures were systematically investigated using three main spectroscopy methods. Comparative studies on the charge dynamics and Mott transition features of transition-metal oxides were performed: Charge dynamics and thermoelectricity in a typical Mott transition system La1−xSrxVO3, charge dynamics in a doped valence-bond solid system (Ti1−xVx)2O3 and in layered nickelates R2-xSrxNiO4 with charge-ordering instability are investigated thoroughly. The results obtained successfully provide a number of novel insights into the emergent phenomena near the Mott transition.

Physics of Transition Metal Oxides

2013-03-09 Technology & Engineering
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Release : 2013-03-09
Genre : Technology & Engineering
Kind : eBook
Book Rating : 980/5 ( reviews)

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Book Synopsis Physics of Transition Metal Oxides by : Sadamichi Maekawa

Download or read book Physics of Transition Metal Oxides written by Sadamichi Maekawa. This book was released on 2013-03-09. Available in PDF, EPUB and Kindle. Book excerpt: The fact that magnetite (Fe304) was already known in the Greek era as a peculiar mineral is indicative of the long history of transition metal oxides as useful materials. The discovery of high-temperature superconductivity in 1986 has renewed interest in transition metal oxides. High-temperature su perconductors are all cuprates. Why is it? To answer to this question, we must understand the electronic states in the cuprates. Transition metal oxides are also familiar as magnets. They might be found stuck on the door of your kitchen refrigerator. Magnetic materials are valuable not only as magnets but as electronics materials. Manganites have received special attention recently because of their extremely large magnetoresistance, an effect so large that it is called colossal magnetoresistance (CMR). What is the difference between high-temperature superconducting cuprates and CMR manganites? Elements with incomplete d shells in the periodic table are called tran sition elements. Among them, the following eight elements with the atomic numbers from 22 to 29, i. e. , Ti, V, Cr, Mn, Fe, Co, Ni and Cu are the most im portant. These elements make compounds with oxygen and present a variety of properties. High-temperature superconductivity and CMR are examples. Most of the textbooks on magnetism discuss the magnetic properties of transition metal oxides. However, when one studies magnetism using tradi tional textbooks, one finds that the transport properties are not introduced in the initial stages.

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