Article

Hyperfine Interactions

, Volume 196, Issue 1, pp 339-347

Thermal evolution of the electric field gradient at 181 Ta in αHfNi

  • Božidar CekićAffiliated withLaboratory of Nuclear and Plasma Physics, Institute of Nuclear Sciences Vinča Email author 
  • , A. UmićevićAffiliated withLaboratory of Nuclear and Plasma Physics, Institute of Nuclear Sciences Vinča
  • , V. IvanovskiAffiliated withLaboratory of Nuclear and Plasma Physics, Institute of Nuclear Sciences Vinča
  • , J. Belošević-ČavorAffiliated withLaboratory of Nuclear and Plasma Physics, Institute of Nuclear Sciences Vinča
  • , V. KoteskiAffiliated withLaboratory of Nuclear and Plasma Physics, Institute of Nuclear Sciences Vinča
  • , Rongwei HuAffiliated withCondensed Matter Physics and Materials Science Department, Brookhaven National LaboratoryDepartment of Physics, Brown University
  • , C. PetrovicAffiliated withCondensed Matter Physics and Materials Science Department, Brookhaven National Laboratory

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Abstract

The perturbed angular correlation method has been employed to study the temperature dependence of the 181Ta hyperfine interaction parameters in the polycrystalline intermetallic compound αHfNi. At ambient temperature the frequency of the electric quadrupole interaction was ω Q = 26.0(2) Mrad/s and the asymmetry parameter η = 0.22(1). The magnitude of the observed electric field gradient decreases with increasing temperature from 78 to 900 K. The calculations were done using the augmented plane wave plus local orbitals method as implemented in the WIEN2k code, using the generalized gradient approximation. In addition, a supercell calculation with Ta impurity located at the hafnium site was performed. The obtained result is in a good agreement with the experiment.

Keywords

HfNi Electric field gradient PAC APW + lo

PACS

71.70.Jp 76.80.+y 75.20.−g 71.15.Ap 71.20.Lp