TDPAD measurements of magnetic hyperfine field for 132 Ba in ferromagnetic Ni
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TDPAD measurements of magnetic hyperfine field for 132 Ba in ferromagnetic Ni Sudipta Saha1 · S. K. Mohanta1 · Sayani Biswas1 · R. Palit1 · S. N. Mishra1
Published online: 10 August 2016 © Springer International Publishing Switzerland 2016
Abstract The magnetic hyperfine field of Ba in ferromagnetic Ni has been measured by time differential perturbed angular distribution technique using the 13 ns 10+ isomeric state in 132 Ba as probe which was populated in the reaction 12 C(124 Sn, 4n)132 Ba at beam energy of 60 MeV. The hyperfine field extracted from the observed Larmor precession frequency comes out to be −84(5) kG. Our experimental results show good agreement with theoretical calculations performed within local density approximation of the density functional theory. The hyperfine field data presented here would be useful towards accurate determination of g-factor in other high spin states in Ba isotopes. Keywords Magnetic hyperfine field · TDPAD · g-factor
1 Introduction Investigations of magnetic hyperfine field for impurity atom in ferromagnetic hosts has been a topic of considerable interest over many years as they provide useful microscopic information regarding spin density and its distribution, which in turn are crucial for understanding long range magnetic ordering in solids. Accurate measurement of magnetic hyperfine field for impurity atom in ferromagnetic hosts are also important for precise determination of nuclear magnetic moments, critical for nuclear structure physics. Over the years systematic studies have been made for variety of impurities in ferromagnetic hosts like Fe, Co and Ni and their trends across the periodic table of elements have been established [1]. Parallel with
This article is part of the Topical Collection on Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2016), Leuven, Belgium, 3-8 July 2016 S. N. Mishra
[email protected] 1
Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai, 400005, India
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the experimental measurements extensive theoretical studies have been carried out to understand the origin and variation of hyperfine field of different impurity atoms [2–4]. There has been remarkable agreement between experiment and theoretical values for many cases. However, for heavy impurity atoms like Cs, Ba and La very few measurements have been reported [1, 4–6]. As far as we know, no experimental measurements have been reported for Ba in Co and Ni. In the theoretical front, few calculations are available for Fe host with values differing significantly from one another [7]. In this regard it is important to make accurate measurements of hyperfine field for these impurity atoms. In this work we present our results on the magnetic hyperfine field for Ba impurity in ferromagnetic Ni host studied through TDPAD measurements and ab-initio calculations.
2 Experimental and calculation details For TDPAD measurement of magnetic hyperfine field for Ba in Ni we have
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