Theory of singlet-doublet excitations in praseodymium

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The magnetic excitation spectrum in a paramagnetic singlet-doublet system is calculated using a diagrammatic high density expansion technique. The lowest order diagrams, which correspond to the random phase approximation (RPA), give a detailed description of the wave vector and temperature dependence of the four exciton modes in praseodymium in terms of a Hamiltonian including isotropic Heisenberg exchange interactions and anisotropic, dipolar-like interactions. The leading contributions to the linewidths of the excitations are obtained by extending the 1/Z expansion of the generalized susceptibility propagators one order beyond the random phase approximation. This damping corresponds to spin wave scattering on single-site fluctuations. ... continued below

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5 p.

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Bak, P. October 1, 1975.

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The magnetic excitation spectrum in a paramagnetic singlet-doublet system is calculated using a diagrammatic high density expansion technique. The lowest order diagrams, which correspond to the random phase approximation (RPA), give a detailed description of the wave vector and temperature dependence of the four exciton modes in praseodymium in terms of a Hamiltonian including isotropic Heisenberg exchange interactions and anisotropic, dipolar-like interactions. The leading contributions to the linewidths of the excitations are obtained by extending the 1/Z expansion of the generalized susceptibility propagators one order beyond the random phase approximation. This damping corresponds to spin wave scattering on single-site fluctuations. The theoretical spectral functions are in detailed agreement with experiment. (auth)

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5 p.

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Dep. NTIS

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  • 21. annual conference on magnetism and magnetic materials, Philadelphia, Pennsylvania, USA, 9 Dec 1975

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  • Report No.: BNL--20626
  • Report No.: CONF-751209--13
  • Grant Number: None
  • Office of Scientific & Technical Information Report Number: 4114062
  • Archival Resource Key: ark:/67531/metadc863516

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

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  • October 1, 1975

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  • Sept. 16, 2016, 12:32 a.m.

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  • Oct. 10, 2017, 9:20 p.m.

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Bak, P. Theory of singlet-doublet excitations in praseodymium, article, October 1, 1975; Upton, New York. (digital.library.unt.edu/ark:/67531/metadc863516/: accessed October 22, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.