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

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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.

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Authors and Affiliations

  1. Laboratory of Nuclear and Plasma Physics, Institute of Nuclear Sciences Vinča, P.O. Box 522, 11001, Belgrade, Serbia

    Božidar Cekić, A. Umićević, V. Ivanovski, J. Belošević-Čavor & V. Koteski

  2. Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory, Upton, NY, 11973, USA

    Rongwei Hu & C. Petrovic

  3. Department of Physics, Brown University, Providence, RI, 02912, USA

    Rongwei Hu

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  1. Božidar Cekić
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  2. A. Umićević
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  3. V. Ivanovski
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  4. J. Belošević-Čavor
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  5. V. Koteski
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  6. Rongwei Hu
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  7. C. Petrovic
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Correspondence to Božidar Cekić.

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Cekić, B., Umićević, A., Ivanovski, V. et al. Thermal evolution of the electric field gradient at 181Ta in αHfNi. Hyperfine Interact 196, 339–347 (2010). https://doi.org/10.1007/s10751-009-0135-1

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  • DOI: https://doi.org/10.1007/s10751-009-0135-1

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