By R. J. Elliott (auth.), Dr. Marcel Ausloos, Professor Dr. Roger J. Elliott (eds.)

ISBN-10: 3642821383

ISBN-13: 9783642821387

ISBN-10: 3642821405

ISBN-13: 9783642821400

The current quantity comprises the classes given at a summer time university on "Magne­ tic section Transitions" held on the Ettore Majorana Centre for clinical tradition, at Erice (Trapani), Italy in July 1983 less than the auspices of the Condensed topic department of the eu actual Society of their sequence on fabrics technological know-how and know-how. the scholar members got here from West Germany, nice Britain, Brazil, Greece, Switzerland, Sweden, Italy, united states and The Netherlands. the academics got here from numerous ecu international locations, Israel, united states and Canada. the ambience on the assembly used to be very good and a very good spirit of spouse­ send constructed in the course of weeks of operating jointly. The unfold of pursuits one of the academics and scholars used to be divers;jfied yet balanced. the most lec­ turing contributions are stated during this quantity. They signify updated studies in a pedagogical sort. additionally, casual shows on cur­ lease examine pursuits have been made that have now not been integrated. the varsity tried to summarize the present place at the homes of magnetic section transitions from numerous issues of view. the variety and scope of the­ oretical ideas, and of specific points of fabrics or phenomena as saw experimentally have been rather well recommend by way of the teachers. The grouping of manuscripts in chapters doesn't characterize, even though, the sched­ ule throughout the university. Contributions on mean-field approximations and renormalization-group tools both for static or dynamic phenomena are available at a number of areas within the following sections.

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Extra info for Magnetic Phase Transitions: Proceedings of a Summer School at the Ettore Majorana Centre, Erice, Italy, 1–15 July, 1983

Example text

Thus single-particle excitations appear to playa significant role in Ni although standard Stoner theory must be too simple. Nevertheless a natural interpretation of recent energy, spin and angle-resolved photoemission is that the exchange splitting between t and + spin bands reduces to zero at Tc in a Stoner-like way [ 29]. 2. Stoner theory has been applied extensively to very weak itinerant ferromagnets such as ZrZn2 and Ni3Al [30 J. 3. However in very recent de Haas-van Alphen work on ZrZn2 by LONZARICH [31] the t spi nand + spi n Fermi surfaces are observed to shrink and grow, respectively, with increasing temperature in a way that is compatible with Stoner theory.

A very interesting CPA discussion of these systems has been given by JO [ 21 I who finds that the antiferromagnetism to spin glass transition is second order whereas the transition to ferromagnetism is first order. 3 Metamagnetism If SO) it is possible for E(M) to exhibit a Subsldiary minimum at some finite magnetization M1 and E(M1»Eo ' In the presence of a magnetic field H, (13) acquires an extra term - MH and at a critical field H 't' approximately given by M1Hcri_t, = E(M 1 ) - Eo' a first-order transitio~r6Ccurs from a small value of f1MJ.

Hopfield: Phys. Lett. J. Kim: Phys. Rev. B 25 , 0919 (1982) 26 D. Fay and J. Appel: Phys. Rev. B 20 , 3705 (1979) 27 G. S. Knapp, E. Corenzwit and C. W-:--Chu: Solid State Commun. G. Petti for and D. M. Roy: Solid State Commun. J. Gale, V. G. M. G. de Vallera: Inst. Phys. Conf. Proc. 39 , 161 (1978) 29 E. L. (Grenoble) Report (1983) 30 D. M. P. Wohlfarth; Proc. Roy. Soc. P. Wohlfarth, Physica 91B , 305 (1977) --31 G. L. (Grenoble) Report (1983) 32 G. V. Gold: Can. J. Phys. M. Edwards: Can. J. Phys.

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Magnetic Phase Transitions: Proceedings of a Summer School at the Ettore Majorana Centre, Erice, Italy, 1–15 July, 1983 by R. J. Elliott (auth.), Dr. Marcel Ausloos, Professor Dr. Roger J. Elliott (eds.)

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