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Relaxation phenomena in magnets at ultra low temperatures. II

Authors
Journal
Physics Reports
0370-1573
Publisher
Elsevier
Publication Date
Volume
139
Issue
3
Identifiers
DOI: 10.1016/0370-1573(86)90033-5
Disciplines
  • Physics

Abstract

Abstract A theory of fast relaxation in easy-axis antiferromagnets is presented for conditions where the external magnetic field exceeds the spin-flip field. A possibility of rapid nuclear spin cooling is predicted. A theory is constructed which describes interaction between electromagnetic radiation and the nuclear subsystem. Light scattering from nuclear temperature fluctuatins is describe both quantitiatively and quantitatively. The intrinsic NMR frequency in a disordered ferromagnet is calculated. Dissipativeless hydrodynamics of a two-velocity and two-temperature “NSW-magnon liquid” in an “easy-axis” antiferromagnet is described for the case where the external field is close to the spin-flip field. The limiting behavior of heat capacity at ultra low temperatures is discussed.

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