Hyperfine field of La impurity in Fe host: Experiment and theory

The magnetic hyperfine field of La impurity in ferromagnetic Fe host has been measured by time differential perturbed angular distribution (TDPAD) technique, using the 2738 keV 23/2 + , isomeric state in 135 La as nuclear probe, populated in the reaction 128 Te 11 B , 4 n 135 La at beam energy of 52...

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Bibliographic Details
Published in:Hyperfine interactions 2019-12, Vol.240 (1), p.1-8, Article 96
Main Authors: Laskar, Md. Sazedur Rahaman, Saha, Sudipta, Palit, Rudrajyoti, Mishra, Surendra Nath, Babra, Farhan Sabir, Biswas, Sayani, Singh, Purnima, Mohanta, Susanta Kumar
Format: Article
Language:English
Subjects:
10-15 February 2019
Angular distribution
Atomic
Condensed Matter Physics
Density functional theory
Dependence
Ferromagnetism
Goa
Hadrons
Heavy Ions
Hyperfine structure
Impurities
India
Larmor precession
Mathematical analysis
Molecular
Nuclear Physics
Optical and Plasma Physics
Physics
Physics and Astronomy
Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2019)
Rotation
Surfaces and Interfaces
Thin Films
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Summary:The magnetic hyperfine field of La impurity in ferromagnetic Fe host has been measured by time differential perturbed angular distribution (TDPAD) technique, using the 2738 keV 23/2 + , isomeric state in 135 La as nuclear probe, populated in the reaction 128 Te 11 B , 4 n 135 La at beam energy of 52 MeV. The spin rotation spectra, R(t) measured in applied field of 2 T showed Larmor precession frequency of ω L = 93.9 ± 4.7 Mrad/sec, which corresponds to a magnetic hyperfine field, B h f of 42.1 ± 3.3 T. From the sense of rotation observed in the R(t) spectra, the sign of the B h f has been determined to be negative. Complimenting the experimental studies, we have performed ab-inito calculations of hyperfine field within the frame work of the density functional theory using supercell method. The calculated magnetic hyperfine field shows strong dependence with impurity concentration scaled by the supercell size. For a 2 × 2 × 2 supercell representing La concentration of 6.25 % we obtained B h f = -21.2 T while, for a 3 × 3 × 3 supercell, corresponding to an impurity concentration of 1.8 % La, the B h f comes out to be -48.3 T, closely agreeing with our experimental value.
ISSN:0304-3843
1572-9540
DOI:10.1007/s10751-019-1631-6