4 edition of Cooperative phenomena in Jahn-Teller crystals found in the catalog.
Cooperative phenomena in Jahn-Teller crystals
Michael D. Kaplan
Includes bibliographical references and index.
|Statement||Michael D. Kaplan, Benjamin G. Vekhter.|
|Series||Modern inorganic chemistry|
|Contributions||Vekhter, Benjamin G.|
|LC Classifications||QD461 .K298 1995|
|The Physical Object|
|Pagination||xv, 427 p. :|
|Number of Pages||427|
|LC Control Number||94046426|
In crystals with PJTE centers the interaction between the local distortions may lead to their ordering to produce a phase transition to a regular crystal phase with lower symmetry. Typically it will move on the timescale of a vibrational period which is for small molecules of the order of fs, i. The two branches of the APES for the case of strong PJTE resulting in the instability of the ground state when the condition of instability 11 holds are illustrated in Fig. London A1 Papers : 1.
In a recent development it was shown that in inorganic crystals with PJTE centers, in which the local distortions are not ordered before the phase transition to the cooperative phasethe effect of interaction with external perturbations contains an orientational contribution which enhances the observable properties by several orders of magnitude. With this book the first stage of the JTE theory was accomplished, resulting in a full understanding of the basics of this phenomenon: the JTE became a firmly established trend in the theory of matter. Palii, M. Palii, Magnetic properties of complex d1 and d5 ions: crystal field model, Jahn-Teller effect, Polyhedron 22
As follows from that said above and in more detail from Section 2. There is a plethora of femtosecond pump-probe spectroscopic techniques to reveal details of these processes occurring, for example, in the process of vision. Earlier stages of development of this field are presented in a series of books and reviews [1. Category: Science. Moffit and W.
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On the other hand, detailed citations and a full list of references to each chapter are included to allow the reader to go to original work for more details, if necessary.
This can produce a cooperative JTE, where global distortions of the crystal occur due to local degeneracies. Geschwind, New York, Plenum, An important part of the modern theory of the cooperative JTE,  can lead to structural phase transitions. Reu, B. Tsukerblat, E.
In other words the non-JT approach ignores the mixing of electronic states by nuclear displacements and the back influence of this mixing on the phonon spectrum. Similar to the above-mentioned molecular bistability induced by the hidden PJTE, a magnetic-dielectric bistability due to two coexisting equilibrium configurations with corresponding properties may take place Cooperative phenomena in Jahn-Teller crystals book in crystals with transition metal centers, subject to the electronic configuration with half-filled e2 or t3 shells.
An interesting typical situation of hidden PJTE emerges in molecular and solid state systems with valence half-filed closed shells electronic configurations e2 and t3.
In fact the JT theory is an approach to a tool for general understanding and solving of molecular and crystal problems, which is in principle applicable to any system with more than two atoms.
Such cooperative PJTE is quite similar to the cooperative JTE; it was shown in one of the first studies of the PJTE in solid state systems  that in the case of ABO3 crystals with perovskite structure the local dipolar PJTE distortions at the transition metal B center and their cooperative interactions lead to ferroelectric phase transitions.
Assuming that the excited state is sufficiently close to the ground one, the vibronic coupling between them should be treated as a perturbation problem for two near-degenerate states.
Bleaney and D. Turnbull, and H. Terzi, Singapore, World Scientific,p. Bersuker and V. The argument of Jahn and Teller assumes no details about the electronic structure of the system.
The second goal is to give this introduction in a way which allows the reader to get a general although maybe rather rough and superficial impression of the whole subject and its possibilities, a very brief insight into this trend without reading the corresponding chapters or sections.
Using this model it can be shown, for example, that the origin of the unusual ground insulating ferromagnetic state of a solid like K2CuF4 can be traced to its orbital ordering.
Harley, W. Earlier stages of development of this field are presented in a series of books and reviews [1.Slaughter, the jahn teller effect continues to be a paradigm for structural instabilities and dynamical processes in molecules and in the condensed phase among the many important newer developments in the field one should mention cooperative phenomena in crystals the general importance of buy the jahn teller effect fundamentals and.
Stanford Libraries' official online search tool for books, media, journals, databases, government documents and more. Among the many important newer developments Cooperative phenomena in Jahn-Teller crystals book the field one should mention cooperative phenomena in crystals, the general importance of pseudo-Jahn-Teller couplings for symmetry-lowering phenomena in molecular systems, non-adiabatic processes at conical intersections of potential energy surfaces and extensions of the basic theory in relation Author: Horst Köppel.Jahn–Teller effect explained.
The Jahn–Teller effect (JT effect or JTE) is pdf important mechanism of spontaneous symmetry breaking in molecular and solid-state systems which has far-reaching consequences in different fields, and is responsible for a variety of phenomena in spectroscopy, stereochemistry, crystal chemistry, molecular and solid-state physics, and materials science.Among the many important developments in the field we mention cooperative phenomena in crystals, the general importance of pseudo-Jahn-Teller couplings for symmetry-lowering phenomena in molecular systems, nonadiabatic processes at conical intersections of potential energy surfaces and extensions of the basic theory in relation to the discovery.The Jahn–Teller effect (JT effect or JTE) is an important ebook of spontaneous symmetry breaking in molecular and solid-state systems which has far-reaching consequences in different fields, and is responsible for a variety of phenomena in spectroscopy, stereochemistry, crystal chemistry, molecular and solid-state physics, and materials science.