Magnetic susceptibility of superconductors an other spin systems : [proceedings of the Office of Naval Research Workshop on magnetic suseptibility of superconductors and other spin systems, held May 20 -23, 1991, in Coolfont, Berkeley Springs, West Virgin

The workshop entitled Magnetic Susceptibility of Superconductors and other Spin Systems (S4) was held at Coolfont Resort and Health Spa. located near Berkley Springs West Virginia on May 20-23. 1991. There were over sixty attendees. approximately half from the United States. the remainder representing over twelve different countries. The international character of the workshop may be gleaned form the attendee list, included in this volume. The intent of the workshop was to bring together those experimentalists and theoreticians whose efforts have resulted in significant recent contributions to the development and use of the ac susceptibility technique as well as to the interpretation of data obtained from these measurements. Many spirited discussions occurred during and after the presentations. These are reflected in the manuscripts contained in these proceedings. Although camera ready manuscripts were required from all participants at registration, all manuscripts were revised and reflect the lively exchanges that followed each presentation. The small size of the workshop allowed the participants a high degree of flexibility. Consequently when a controversial topic such as "the irreversibility line" emerged, a special session was organized on the spot. At the suggestion of Ron Goldfarb, participants were invited to contribute a one page summary containing their thoughts on the topic. These stand alone contributions were retyped and included as submitted, with only minor editorial changes. These proceedings are intended for those experienced scientists new to the field and graduate students just beginning their research. Front Matter....Pages i-xx Multipurpose Cryostat for Low Temperature Magnetic and Electric Measurements of Solids....Pages 1-24 Ac Susceptibility Responses of Superconductors: Cryogenic Aspects, Investigation of Inhomogeneous Systems and of the Equilibrium Mixed State....Pages 25-48 Alternating-Field Susceptometry and Magnetic Susceptibility of Superconductors....Pages 49-80 Ac Inductive Measurement: Its Application to the Studies of High T c Superconductivity....Pages 81-105 Ac Susceptibility Studies of Superconducting Properties Under High Hydrostatic Pressure....Pages 107-128 DC Magnetisation and Flux Profile Techniques....Pages 129-155 Studies of “Non-ideal” Superconductors using Dc Magnetic Methods....Pages 157-176 Ac Losses in Type-II Superconductors....Pages 177-211 Early Theories of χ′ and χ′′ of Superconductors: The Controversial Aspects....Pages 213-228 Detailed Theory of the Magnetic Response of High-Temperature Ceramic Superconductors....Pages 229-250 Exponential Critical-State Model Fit for Intergranular Ac Susceptibility of Sintered High- T c Superconductors....Pages 251-258 Phenomenological Model Fit to Intragranular Ac Susceptibility of Sintered High- T c Superconductors....Pages 259-265 Critical Current Densities from ac Susceptibility Data....Pages 267-287 Responses of High T c Superconductors to Various Combinations of AC and DC Magnetic Fields....Pages 289-311 Nonlinear A.C. Susceptibility Response Near the Irreversibility Line....Pages 313-332 Higher Harmonics of Single-Crystal YBa 2 Cu 3 O y Thin Films and Bulk Samples....Pages 333-351 The Frequency Dependence of the AC Irreversibility Line of some High Temperature Superconductors....Pages 353-364 Utility of the χ ac Response in the Low Field Limit for Characterizing Inhomogeneous Superconductors....Pages 365-376 A.C. Susceptibility Studies of Type-II Superconductors: Vortex Dynamics....Pages 377-388 A Study of Reversible and Irreversible Magnetization Behaviour in Conventional Superconductors....Pages 389-404 AC Susceptibility Techniques Applied to Thin Film Superconductors....Pages 405-422 A self Contained Inductance Bridge for Rapid NDT of Superconducting Thin Films....Pages 423-428 Characterization of Tl 2 Ba 2 CaCu 2 O 8 -Films and Single Crystals by an AC-Susceptibility Method....Pages 429-436 Temperature Dependent Penetration Depths from the ac Magnetic Response of Thin Films....Pages 437-453 Magnetic Detection of Optical Excitations in HTSC Thin Films by a.c. Susceptibility Measurements....Pages 455-473 AC Susceptibility of Dilute Magnetic Systems....Pages 475-502 Spin-Glass and Superconducting Properties....Pages 503-518 Novel Low Field ac Magnetic Susceptibility Technique in UHV: Magnetism of hcp Gd(0001)....Pages 519-529 Magnetically Modulated Resistance Techniques....Pages 531-551 High-Field ac Susceptometer Design for Measurements of Superconducting Single Crystals and Results....Pages 553-559 Balancing Coils for 10 MHz Susceptibility Signals....Pages 561-565 Reversibility Line Measurements in a SQUID Without Sample Movement....Pages 567-577 Automatic Temperature Calibration During Swept Temperature Magnetisation Measurements....Pages 579-586 Back Matter....Pages 587-606 Section 1 - Basic experimental techniques and concepts; Section 2 - Theoretical considerations and phemonological models; Section 3 - Bulk and single crystal samples; Section 4 - Thin films; Section 5 - Magnetically ordered and spin-glass systems; Section 6 - Specialized measuring techniques