In this book some 50 papers published by K A Müller as author or co-author over several decades, amplified by more recent work mainly by T W Kool with collaborators, are reproduced. The main subject is Electron Paramagnetic Resonance (EPR) applied to the study of perovskites and other oxides with related subjects. This wealth of papers is organized into eleven chapters, each with an introductory text written in the light of current understanding. The contributions of the first editor on structural phase transitions have been immense, and because K A Müller and J C Fayet have published a review paper on the subject, the latter is reproduced in chapter VII. Not related to EPR is a part of chapter VIII on the dipolar and quantum paraelectric behavior with dielectric studies. In chapter X two papers proving the existence of Fermi glasses are reproduced. The year 1986 bears some significance: early in this year the paper by Bednorz and Müller on the possible observation of superconductivity was published. This resulted in a substantial shift in the paradigm of condensed matter physics, to which the present first editor has contributed scientifically with others and which will be reviewed in a second volume. Key Features • It groups the reproduced papers according to the subject they deal with and not just historically • Each of the eleven chapters is preceded by an introductory text. This allows an interested reader to understand the main advance exposed and find relevant publications • The whole volume shows the application of the EPR method over a period of half a century. The understanding of especially the Jahn–Teller effect led to the discovery of high temperature superconductivity • K Alex Müller — Nobel Prize winner in physics in 1987

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