Electric field gradients of Lu and Hf in Re

E. Hagn, M. Zahn, and E. Zech
Phys. Rev. B 28, 3130 – Published 15 September 1983
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Abstract

The nuclear orientation technique has been applied to dilute Lu173(jπ=72+;T12=1.37 yr) and Hf175(jπ=52;T12=70 d) nuclei in a hexagonal Re crystal, the activities being produced in situ via the nuclear compound reaction Re185,187(α,xn yp) at Eα=172.5 MeV. From the γ-ray anisotropies at temperatures down to 8 mK the quadrupole interaction frequencies νQ=e2qQh of Lu173Re and Hf175Re have been determined as -1149(100) MHz and -540(43) MHz, respectively. The electric field gradients (EFG's) are deduced to be eq(LuRe)=13.2(1.2)×1017 V/cm2 and eq(HfRe)=8.3(8)×1017 V/cm2. The negative sign in both cases indicates that the direction of the EFG at the impurity sites is uniquely fixed by the properties of the host lattice. The absolute magnitudes of these EFG's differ strongly from that of the pure system ReRe; they cannot be explained satisfactorily with any correlation known at present.

  • Received 30 December 1982

DOI:https://doi.org/10.1103/PhysRevB.28.3130

©1983 American Physical Society

Authors & Affiliations

E. Hagn, M. Zahn, and E. Zech

  • Physik-Department, Technische Universität München, D-8046 Garching, Federal Republic of Germany

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Issue

Vol. 28, Iss. 6 — 15 September 1983

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