Tunneling systems in amorphous and crystalline solids

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This book aims to provide extensive information on the influence of quantum-tunneling systems on the low-temperature properties of solids. Nineteen contributors review thermodynamic, acoustic, dielectric, and optical properties of both amorphous and crystalline solids across eight chapters. The latest experiments on long-time spectral diffusion, heat release, electric field and strain effects, as well as nonequilibrium phenomena are thoroughly examined. Several theoretical contributions overview the most original ideas and methods currently employed to understand the nature and dynamics of tunneling systems in solids and their interactions. The book details both experimental and theoretical aspects of relevant studies. It covers a broad spectrum of properties related to tunneling systems, with selected topics valuable to both experienced researchers and graduate students engaged in low-temperature research. Most chapters serve as useful introductory surveys, ensuring accessibility without being overly specialized. Acknowledgments are given to colleagues for their important comments on various chapters, and appreciation is expressed to Mrs. Annette Setzer for assistance with the reference list, along with gratitude to co-workers at the Department of Superconductivity and Magnetism, Universität Leipzig, for their support.