The Van Vleck Orbit-Lattice Interaction in Rare-Earth Ethyl Sulfates and Its Application to Relaxation

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概要

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• The Van Vleck orbit-lattice interaction appropriate for the trigonal XY_3Z_6 molecular cluster transforming as D_<3h> has been computed from the collective coordinates. The comparison of this interaction with the approximations made by Orbach and the Berkeley group is also made. This interaction has been applied to estimate the spin-lattice relaxation times for Ce^<3+> and Sm^<3+> in lanthanum ethyl sulfate and in yttrium ethyl sulfate, and Dy^<3+> in dysprosium ethyl sulfate. The agreement between the estimated relaxation rates and the data is quite acceptable. In addition, the exponential term with Δ=72 K for Sm^<3+> in lanthanum ethyl sulfate has been identified as arising from the relaxation process attributed to the optical phonons at energies around 78 K which have been determined from the infrared spectra. The theoretical estimate based on this relaxation process has been made and it agrees with the experimental result within one order of magnitude.

• 社団法人日本物理学会の論文
• 1973-03-05

著者

• Huang Chao-yuan

  Department Of Physics Case Western Reserve University

• Huang Chao-yuan

  Department Of Physics Millis Science Center Case Western Reserve University

• Sugawara Kazushi

  Department Of Phsics Case Western Reserve University

• Sugawara Kazushi

  Department Of Physics Millis Science Center Case Western Reserve University

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• The Temperature Dependence of the Zero Field Splitting of Eu^ in Fluorine Cubic Crystals
• The Van Vleck Orbit-Lattice Interaction in Rare-Earth Ethyl Sulfates and Its Application to Relaxation
• Paramagnetic Relaxation of Some Non-Kramers Rare-Earth Ethyl Sulfates
• The Temperature Dependence of the Hyperfine Coupling Constant of Eu^ (4f^7) in CaF_2 and SrF_2
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• Determination of the Crystal-Field Splittings of Dy^, Er^ and Ce^ by the Gd^ Reference
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