This book provides a concise but thorough introduction to important phenomena of low-temperature physics. It is ideally suited as a textbook for advanced undergraduates but will also be valuable for graduate students, scientists and engineers working in this field. Clear explanations of both theoretical and experimental approaches coupled with carefully selected problems will enable students to gain a firm understanding of even the most recent research developments. Science is often a journey to the limits of the feasible and ascertainable. In low-temperature physics this journey strives towards absolute zero. When Louis Cailletet on December 2nd, 1877, realized a major step in terms of the production of low temperatures, namely the ?rst liquefaction of oxygen, he could hardly imagine the wealth of exciting physical phenomena that would bediscoveredinthis?eld. Despitetheanticipation fromeverydayexperience, which generally equates cold with discomfort and sti?ening, condensed m- ter at low temperatures reveals a wide array of fascinating properties. As the mostprominentexamplesletusmentionsuper?uidityandsuperconductivity, whose attraction is undiminished since their discovery. With every step - wards lower temperatures numerous new insights have resulted, which make the traditional subject of low-temperature physics an attractive and modern research topic. The present book is based on material from lectures that both authors have given several times at the universities of Heidelberg, Bayreuth and Konstanz. It is focused on the discussion of physical phenomena that become most apparent at low temperatures. The book is mainly aimed at students, and provides a compact and comprehensible introduction to various topics of low-temperature physics. Selection and emphasis of the material is subj- tive and certainly re?ects our personal preferences. However, we have tried to give room for as wide a spectrum of topics as possible. The contents are organized in three parts, entitled quantum ?uids, solids at low temperatures and principles of refrigeration and thermometry. "This book provides a concise but thorough introduction to important phenomena of low-temperature physics. It is ideally suited as a textbook for advanced undergraduates but will also be valuable for graduate students, scientists and engineers working in this field. Clear explanations of both theoretical and experimental approaches coupled with carefully selected problems will enable students to gain a firm understanding of even the most recent research developments."--Résumé de l'éditeur "This book provides a concise but thorough introduction to important phenomena of low-temperature physics. It is ideally suited as a textbook for advanced undergraduates but will also be valuable for graduate students, scientists and engineers working in this field. Clear explanations of both theoretical and experimental approaches coupled with carefully selected problems will enable students to gain a firm understanding of even the most recent research developments."--Jacket Helium — General Properties....Pages 3-13 Superfluid 4 He — Helium II....Pages 15-76 Normal-Fluid 3 He....Pages 77-96 Superfluid 3 He....Pages 97-146 Mixtures of 3 He and 4 He....Pages 147-163 Phonons....Pages 167-203 Conduction Electrons....Pages 205-243 Magnetic Moments — Spins....Pages 245-282 Tunneling Systems....Pages 283-341 Superconductivity....Pages 343-446 Cooling Techniques....Pages 449-504 Thermometry....Pages 505-541 Presents experiment, theory and technology in a unified manner. Contains numerous illustrations, tables and references as well as carefully selected problems for students. Surveys the fascinating historical development of the field. Evidence for the existence of the rare noble gas helium was first obtained by the French astronomer Janssen in the visible spectrum of solar protuberances during a total eclipse in 1868 in India [1].