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This series of books, which is published at the rate of about one per year, addresses fundamental problems in materials science. The contents cover a broad range of topics from small clusters of atoms to engineering materials and involves chemistry, physics, materials science and engineering, with length scales ranging from Ångstroms up to millimeters. The emphasis is on basic science rather than on applications. Each book focuses on a single area of current interest and brings together leading experts to give an up to date discussion of their work and the work of others. Each article contains enough references that the interested reader can access the relevant literature. Thanks are given ...
Mixed-valence manganites have attracted considerable attention since the late 19th century. The intriguing interplay of charge, spin and orbital ordering in the manganites systems superimposed by interface/surface effects provides a scientific platform beneficial for both fundamental and application-oriented research. The fundamental basis for understanding physical properties and designing new functionalities of manganites is the concept of the symmetry of order parameters which can be manipulated artificially by controlling the interplay of electronic degrees of freedom. This book explores the possibility of externally modifying the properties of manganite based thin films and heterojuncti...
The physics of transition metal oxides has become a central topic of interest to condensed-matter scientists ever since high temperature superconductivity was discovered in hole-doped cuprates with perovskite-like structures. Although the renewed interest in hole-doped perovskite manganites following the discovery of their colossal magnetoresistance (CMR) properties, began in 1993 about a decade after the discovery of high temperature superconductivity, their first investigation started as early as 1950 and basic theoretical ideas were developed during 1951-1960. Experience in sample preparation and characterization, and in growth of single crystals and epitaxial thin films, gained during th...
This book presents insights into manganese oxides, which are materials with important technological applications such as magnetic refrigeration and magnetic sensors. It provides many mathematical proofs carried out in a didactic and elegant way; some of them use, for example, the method of mathematical induction. The book will be of interest to both researchers of physical sciences and the general reader interested in the subject.
The doped manganese oxides (manganites) have been widely studied for their colossal magnetoresistive effects, for potential applications in oxide spintronics, electroforming in resistive switching devices, and are materials of choice as cathodes in modern solid oxide fuel cells. However, little experimental knowledge of the dynamics of the surfaces of perovskite manganites at the atomic scale exists. Here, through in-situ scanning tunnelling microscopy (STM), we demonstrate atomic resolution on samples of La0.625Ca0.375MnO3 grown on (001) SrTiO3 by pulsed laser deposition (PLD). Furthermore, by applying triangular DC waveforms of increasing amplitude to the STM tip, and measuring the tunnelling current, we demonstrate the ability to both perform and monitor surface electrochemical processes at the atomic level, including, for the first time in a manganite, formation of single and multiple oxygen vacancies, disruption of the overlying manganite layers, and removal and deposition of individual atomic units or clusters. Our work paves the way for better understanding of surface oxygen reactions in these systems.
Materials which are both ferromagnetic and ferroelectric like yttrium manganite have interesting features and applications as non-volatile memory devices. In this book different properties of Yttrium Manganite is investigated using first principle calculation on cubic and Hexagonal structures. Electronic structures, phonon modes and structural stabilities are one of the properties that has been discussed. DFT calculations of such strongly correlated materials shows metallic ground state though they are insulators. In order to correct this we implement Generalized Gradiednt Approximation (GGA) plus Hubbard U correction to density functional theory found interesting results. All the results in this book were done using electronic structure simulation code, Quantum Espresso (QE).