The temperature dependence of the anisotropy of the Lamb-Mossbauer 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. The anisotropy of the LMF is very pronounced and changes markedly with temperature: The mean-square atomic dis-0 placements perpendicular to and along the c axis were found to be (x~) i --(0.00226+0.00005) A and (x')ii=(0.0037+0.0005) A' at 4.2 K»d (x'), =(0.00270+0.00007) A' and (x')ii =(0.0061+0.0016) A at 47 K. The quadrupole interaction is e qg/h =(12.30+0.08) MHz independent of temperatur-. At 47 K the center shift has changed by (4.6+0.3) pm/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 Oi --(242+10) K and Oii --(149+20) 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 law is not valid at low temperature.
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