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Download PDF by T.A. Kaplan, S.D. Mahanti: Physics of Manganites

By T.A. Kaplan, S.D. Mahanti

ISBN-10: 0306461323

ISBN-13: 9780306461323

This sequence of books, that is released on the price of approximately one in step with 12 months, addresses basic difficulties in fabrics technology. The contents hide a huge diversity of subject matters from small clusters of atoms to engineering fabrics and includes chemistry, physics, fabrics technological know-how and engineering, with size scales starting from Ångstroms as much as millimeters. The emphasis is on uncomplicated technology instead of on purposes. every one ebook makes a speciality of a unmarried region of present curiosity and brings jointly prime specialists to provide an up-to-the-minute dialogue in their paintings and the paintings of others. each one article includes adequate references that the reader can entry the proper literature. thank you are given to the heart for basic fabrics study at Michigan country college for aiding this sequence. M. F. Thorpe, sequence Editor electronic mail: thorpe@pa. msu. edu V PREFACE This e-book files invited lectures given on the workshop on Physics of Manganites, held at Michigan kingdom college, July 26 29, 1998. Doped manganites are an enticing type of compounds that convey either steel insulator and ferromagnetic to paramagnetic transitions on the similar temperature. This used to be came across within the early Fifties by means of Jonker and van Santen and uncomplicated theoretical rules have been constructed via Zener (1951), Anderson and Hasegawa (1955), and deGennes (1960) to provide an explanation for those transitions and comparable fascinating observations.

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We see a scaling relation S ∝ 1 — M * 2. 3. Inset: Integrated weight S at high energy part ω ~ 2J H . This is explained by the temperature dependence of DOS. Below Curie temperature, the DOS changes as in Fig. 5. Interband optical process at ω ~ 2J H is constructed from a process of making a pair of lowerband hole and upperband electron. Then, the transfer of spectral weight by magnetization creates the change in the optical spectra as follows. For the up spin electrons, the spectral weight of lower and upper subbands are proportional to (1 + M * )/2 and (1 – M * )/2, respectively.

31] A. Georges and G. Kotliar, Phys. Rev. B45, 6479 (1992). [32] M. Jarrel and Th. Pruschke, Z. Phys. B90, 187 (1993). [33] O. Sakai and Y. Kuramoto, Solid State Commun. 89, 307 (1994). [34] C. M. Varma, Phys. Rev. B54, 7328 (1996). [35] J. E. Hirsch, D. J. Scalapino, R. L. Sugar, and R. Blankenbecler, Phys. Rev. Lett. 47, 1628 (1981). [36] J. E. Hirsch, R. L. Sugar, D. J. Scalapino, and R. Blankenbecler, Phys. Rev. B26, 5033 (1982). [37] K. Kubo, J. Phys. Soc. Jpn. 33, 929 (1972). 35 [38] R. de Groot, Phys.

In both of those previous sections the main result is that tendencies to ferromagnetism and phase-separation are in strong competition in these models. Such a phenomenon appears so clearly in all dimensions of interest and for such a wide range of models that it leads us to believe that it may be relevant for experiments in the context of manganites. A discussion of experimental literature that have reported some sort of charge inhomogeneity compatible with phase separation (after Coulomb interactions are added) are briefly described towards the end of the paper.

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Physics of Manganites by T.A. Kaplan, S.D. Mahanti


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