Non-linear spin fluctuations and phase transitions in itinerant electron magnets: CMR manganites
| Title | Non-linear spin fluctuations and phase transitions in itinerant electron magnets: CMR manganites |
| Publication Type | Journal Article |
| Year of Publication | 2012 |
| Authors | Solontsov A, Antropov VP |
| Journal Title | Journal of Magnetism and Magnetic Materials |
| Volume | 324 |
| Pages | 3613-3614 |
| Date Published | 10 |
| Type of Article | Article |
| ISBN Number | 0304-8853 |
| Accession Number | WOS:000306418500058 |
| Keywords | ferromagnets, Magnetic dynamics, magnetic transitions, magnetoresistance, Non-linear spin fluctuations |
| Abstract | We present a review analyzing the effects of coupling of transverse magnons with longitudinal spin fluctuations in isotropic itinerant ferro- and antiferromagnets. It is shown that this coupling essentially changes the spectrum of longitudinal fluctuations. At low-temperatures their spectrum is dominated by the linear Landau relaxation, is purely quasielastic and described by a broad central peak of a paramagnon type. On approaching the critical temperature non-linear magnetic relaxation due to mode-mode couplings can dominate and lead to a rapid increase of the central peak and to a new mechanism of magnetic phase transitions governed by non-linear spin fluctuations. The formalism is applied to the CMR manganites where the observed quasielastic fluctuations can be viewed as non-linear spin-lattice fluctuations strongly affected by magnons. (C) 2012 Elsevier B.V. All rights reserved. |
| URL | <Go to ISI>://WOS:000306418500058 |
| DOI | 10.1016/j.jmmm.2012.02.103 |
| Alternate Journal | J. Magn. Magn. Mater. |
