Microscopic theory for the fluctuation-driven phase transition in weak itinerant magnets

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From 19th conference on magnetism and magnetic materials; Boston, Massachusetts, USA (13 Nov 1973). The microscopic basis for a recent phenomenological theory -for the thermodynamics near T/sub c/ of weak itinerant magnets is presented. Calculation of dynamic renormalization effects within paramagnon theory justifies the previous assumption of weakly temperature dependent Ginsburg- Landau alpha and BETA coefficients. The cutoff on the fluctuation phase space is found to go as q/sub m/= ~ (T/sub c/)/sup 1/3/ rather than the usual inverse coherence length. In spite of the phase space reduction, as T/sub c/ yields -- 0, the phenomenological description becomes exact in ... continued below

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Pages: 10

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Murata, K.K. October 1, 1973.

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From 19th conference on magnetism and magnetic materials; Boston, Massachusetts, USA (13 Nov 1973). The microscopic basis for a recent phenomenological theory -for the thermodynamics near T/sub c/ of weak itinerant magnets is presented. Calculation of dynamic renormalization effects within paramagnon theory justifies the previous assumption of weakly temperature dependent Ginsburg- Landau alpha and BETA coefficients. The cutoff on the fluctuation phase space is found to go as q/sub m/= ~ (T/sub c/)/sup 1/3/ rather than the usual inverse coherence length. In spite of the phase space reduction, as T/sub c/ yields -- 0, the phenomenological description becomes exact in a temperature region of order T/sub c/. However, it is found that the alpha and BETA coefficients must be determined phenomenologically since no small parameter enters the calculation of their overall magnitude. (auth)

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Pages: 10

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  • 19. conference on magnetism and magnetic materials, Boston, Massachusetts, USA, 13 Nov 1973

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  • Report No.: BNL--18281
  • Report No.: CONF-731104--3
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4380734
  • Archival Resource Key: ark:/67531/metadc1023502

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  • October 1, 1973

Added to The UNT Digital Library

  • Oct. 15, 2017, 10:09 p.m.

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  • Oct. 26, 2017, 12:52 p.m.

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Murata, K.K. Microscopic theory for the fluctuation-driven phase transition in weak itinerant magnets, article, October 1, 1973; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc1023502/: accessed September 22, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.