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Temperature dependence of hyperfine interactions and of anisotropy of recoil-free fraction: A Mössbauer study of the 93.3-keV resonance of Zn 67 in single crystals of zinc metal

Temperature dependence of hyperfine interactions and of anisotropy of recoil-free fraction: A... The temperature dependence of the anisotropy of the Lamb-Mössbauer factor (LMF) and of the hyperfine interactions in Zn metal single crystals has been investigated in the temperature range between 4.2 and 47 K using the sharply-defined 93.3-keV transition in Zn 67 . The anisotropy of the LMF is very pronounced and changes markedly with temperature: The mean-square atomic displacements perpendicular to and along the c axis were found to be 〈 x 2 〉 ⊥ = ( 0.002 26 ± 0.000 0 5 ) Å 2 and 〈 x 2 〉 ∥ = ( 0.0037 ± 0 . 0 0 0 5 ) Å 2 at 4.2 K and 〈 x 2 〉 ⊥ = ( 0.002 70 ± 0.000 0 7 ) Å 2 and 〈 x 2 〉 ∥ = ( 0.0061 ± 0 . 0 0 1 6 ) Å 2 at 47 K. The quadrupole interaction is e 2 qQ h = ( 12.30 ± 0 . 0 8 ) MHz independent of temperature. At 47 K the center shift has changed by (4.6±0.3) μm/s compared to its value at 4.2 K due to second-order Doppler shift (SOD). The results on the LMF and SOD can be very well described by an extended Debye model characterized by the two Debye temperatures Θ ⊥ = ( 242 ± 1 0 ) K and Θ ∥ = ( 149 ± 2 0 ) K. The data are also compared with a recent modified axially symmetric model calculation, where a recursion method was applied. The quadrupole data extend earlier measurements obtained by the time differential perturbed angular distribution method. Together with those they show that the T 3 2 law is not valid at low temperature. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review B American Physical Society (APS)

Temperature dependence of hyperfine interactions and of anisotropy of recoil-free fraction: A Mössbauer study of the 93.3-keV resonance of Zn 67 in single crystals of zinc metal

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References (41)

Publisher
American Physical Society (APS)
Copyright
Copyright © 1984 The American Physical Society
ISSN
1095-3795
DOI
10.1103/PhysRevB.30.4980
Publisher site
See Article on Publisher Site

Abstract

The temperature dependence of the anisotropy of the Lamb-Mössbauer factor (LMF) and of the hyperfine interactions in Zn metal single crystals has been investigated in the temperature range between 4.2 and 47 K using the sharply-defined 93.3-keV transition in Zn 67 . The anisotropy of the LMF is very pronounced and changes markedly with temperature: The mean-square atomic displacements perpendicular to and along the c axis were found to be 〈 x 2 〉 ⊥ = ( 0.002 26 ± 0.000 0 5 ) Å 2 and 〈 x 2 〉 ∥ = ( 0.0037 ± 0 . 0 0 0 5 ) Å 2 at 4.2 K and 〈 x 2 〉 ⊥ = ( 0.002 70 ± 0.000 0 7 ) Å 2 and 〈 x 2 〉 ∥ = ( 0.0061 ± 0 . 0 0 1 6 ) Å 2 at 47 K. The quadrupole interaction is e 2 qQ h = ( 12.30 ± 0 . 0 8 ) MHz independent of temperature. At 47 K the center shift has changed by (4.6±0.3) μm/s compared to its value at 4.2 K due to second-order Doppler shift (SOD). The results on the LMF and SOD can be very well described by an extended Debye model characterized by the two Debye temperatures Θ ⊥ = ( 242 ± 1 0 ) K and Θ ∥ = ( 149 ± 2 0 ) K. The data are also compared with a recent modified axially symmetric model calculation, where a recursion method was applied. The quadrupole data extend earlier measurements obtained by the time differential perturbed angular distribution method. Together with those they show that the T 3 2 law is not valid at low temperature.

Journal

Physical Review B – American Physical Society (APS)

Published: Nov 1, 1984

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