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2016 | Buch

Magnetic Perovskites

Synthesis, Structure and Physical Properties

verfasst von: Asish K. Kundu

Verlag: Springer India

Buchreihe : Engineering Materials

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SUCHEN

Über dieses Buch

Magnetic perovskite with multi functional properties (magneto-resistive, magneto-dielectric, multiferroics, spintronics, etc.) have attracted increasing attention due to their possible applications towards storage materials and intriguing fundamental Physics. Despite the numerous investigations on multi functional materials in the past few years, a very few magnetic perovskites have been known to realize as ferromagnetic-insulators. In perovskites centred transition metal oxides strong interplay between lattice, charge, spin and/or orbital degrees of freedom provide a fantastic playground to tune their physical properties. The main purpose of this book is to introduce the phenomenon and physics of complex magnetism (phase separation, spin glass, frustrations, etc.) in perovskite manganites and cobaltites via an experimental approach. The book is organized into four chapters; Chap. 1 gives a brief introduction of various interesting phenomena in magnetic perovskites. Chapter 2 describes the results of the investigations on electronic phase separation and glassy ferromagnetism of the hole-doped perovskite manganites and cobaltites. Ordered and disordered effects and related aspects in hole-doped perovskite cobaltites are described in Chap. 3. Finally, in Chap. 4 the bismuth based magnetic perovskite is discussed.

Inhaltsverzeichnis

Frontmatter
Chapter 1. Introduction to Magnetic Perovskites
Abstract
Perovskites constitute one of the most fascinating classes of solid materials, and show a very wide variety of physical phenomena and properties. Some of the novel properties of the perovskites are known for some time, particularly the paramagnetic-ferromagnetic, insulator-metal transition in perovskite manganites and cobaltites. The discovery of colossal magnetoresistance in perovskite manganites has renewed great interest in perovskites since the early 90’s. Apart from that, the perovskites also exhibit rich phase diagram spanning a wide range of magnetic properties and phenomena like charge ordering, orbital ordering, electronic phase separation, spin-glass behavior and multiferroicity.
Asish K. Kundu
Chapter 2. Electronic Phase Separation and Glassy Behavior in Magnetic Perovskites
Abstract
The electronic phase separation or segregation implies the presence of at least two distinct phases in the same system. But the relative fractions may vary anywhere from a dilute regime, involving small domains of the minor phase (or clusters) in the matrix of the major phase, to a situation in which the fractions of the two phases are comparable. The ferromagnetic clusters present randomly in an antiferromagnetic host matrix often give rise to a glassy behavior. As the ferromagnetic clusters in an antiferromagnetic matrix grow in size to become reasonably sized domains, due to effect of temperature, composition, or an applied magnetic field, the system acquires the characteristics of a genuine phase-separated system with interesting magnetic properties.
Asish K. Kundu
Chapter 3. Ordered-Disordered Perovskite Cobaltites
Abstract
Perovskite cobaltites have two possible forms of the A-site cations distribution depending on the type of cations or the synthesis procedures. The first reported compounds on perovskite cobaltites are the A-site disordered structure and the other one is A-site ordered perovskites also known as layered 112-phases. In 1997, a large value of magnetoresistance was reported for ordered perovskite cobaltites, LnBaCo2O5.4. This leads to enhanced interest because of their potential applications in improving magnetic data storage, magnetic sensors, solid oxides fuel cells and oxygen separation membranes. Aside from potential applications, the perovskite cobaltites also exhibit rich phase diagram spanning a wide range of magnetic properties and phenomena like charge ordering, orbital ordering, spin/cluster-glass behavior, electronic phase separation etc.
Asish K. Kundu
Chapter 4. Bismuth-Centered Perovskite Multiferroics
Abstract
Multifunctional materials (multiferroics, magneto-dielectric, spintronics etc.) have attracted increasing attention due to their possible applications towards storage materials and intriguing fundamental physics. Among the naturally existing oxides, the presence of both ferromagnetism and ferroelectricity is a rare phenomenon, due to the incompatibility between magnetism and ferroelectricity. This incongruity could be at the origin of a limited number of multiferroics, though the researchers are looking for such materials from more than six decades. This phenomenon often occurs in perovskite oxide having the general formula ABO3 and the most well-known examples of existing perovskite multiferroics are BiFeO3 and BiMnO3.
Asish K. Kundu
Backmatter
Metadaten
Titel
Magnetic Perovskites
verfasst von
Asish K. Kundu
Copyright-Jahr
2016
Verlag
Springer India
Electronic ISBN
978-81-322-2761-8
Print ISBN
978-81-322-2759-5
DOI
https://doi.org/10.1007/978-81-322-2761-8

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