Magnons at the Curie temperature

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Random phase approximations (RPA) have bery successfully treated spin wave excitations in Heisenberg ferromagnets at low temperatures. The role played by these magnons at the order-disorder transition, however, has been a topic which has eluded RPA theories to date. In light of recent data, the idea of magnons at the Curie temperature and above has become more difficult to refute. This adds incentive to attempt to model interacting magnons at the Curie temperature. This work examines some attempts to formulate higher random phase approximations and discusses why they fail as they approach the transition temperature. A new interpretation of some ... continued below

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Pages: 13

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Poling, D.A. January 1, 1981.

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Description

Random phase approximations (RPA) have bery successfully treated spin wave excitations in Heisenberg ferromagnets at low temperatures. The role played by these magnons at the order-disorder transition, however, has been a topic which has eluded RPA theories to date. In light of recent data, the idea of magnons at the Curie temperature and above has become more difficult to refute. This adds incentive to attempt to model interacting magnons at the Curie temperature. This work examines some attempts to formulate higher random phase approximations and discusses why they fail as they approach the transition temperature. A new interpretation of some work by Parmenter and the author is presented. The nature of the approximations made in that work is discussed, and an attempt is made to eliminate incorrect contributions from the energetically disfavored paramagnetic state to the correct magnon renormalization.

Physical Description

Pages: 13

Notes

NTIS, PC A02/MF A01.

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  • 27. annual conference on magnetism and magnetic materials, Atlanta, GA, USA, 10 Nov 1981

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  • Other: DE82002375
  • Report No.: LA-UR-81-3106
  • Report No.: CONF-811123-2
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 5928453
  • Archival Resource Key: ark:/67531/metadc1102547

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • January 1, 1981

Added to The UNT Digital Library

  • Feb. 18, 2018, 3:59 p.m.

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  • May 23, 2018, 2:12 p.m.

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Poling, D.A. Magnons at the Curie temperature, article, January 1, 1981; New Mexico. (digital.library.unt.edu/ark:/67531/metadc1102547/: accessed October 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.