Site occupation of indium and jump frequencies of cadmium in FeGa3

Randal Newhouse; Gary S Collins; Matthew O Zacate

doi:10.1007/s10751-016-1341-2

Back

Site occupation of indium and jump frequencies of cadmium in FeGa3

Journal article

Open access

Peer reviewed

Site occupation of indium and jump frequencies of cadmium in FeGa3

Randal Newhouse, Gary S Collins and Matthew O Zacate

Hyperfine interactions, Vol.237(1)

09/27/2016

DOI: https://doi.org/10.1007/s10751-016-1341-2

Handle:

https://hdl.handle.net/2376/121755

Files and links (1)

url

https://doi.org/10.1007/s10751-016-1341-2View

Published (Version of record) Open

Abstract

3-8 July 2016

Article

Atomic

Hadrons

Heavy Ions

Leuven

Molecular

Optical and Plasma Physics

Physics and Astronomy

Proceedings of the International Conference on Hyperfine Interactions and their Applications (HYPERFINE 2016)

Surfaces and Interfaces

Belgium

Condensed Matter Physics

Nuclear Physics

Physics

Thin Films

Perturbed angular correlation (PAC) measurements using the In-111 probe were carried out on FeGa 3 as part of a broader investigation of indium site occupation and cadmium diffusion in intermetallic compounds. One PAC signal was observed with hyperfine parameters ω 1 = 513.8(1) Mrad/s and η = 0.939(2) at room temperature. By comparison with quadrupole frequencies observed in PAC measurements on isostructural RuIn 3 , it was determined that indium occupies only the 8j site in the FeGa 3 structure, denoted Ga(2) below because two out of the three Ga sites have this point symmetry. PAC spectra at elevated temperature exhibited damping characteristic of electric field gradients (EFGs) that fluctuate as Cd probes jump among Ga(2) sites within the lifetime of the excited PAC level. A stochastic model for the EFG fluctuations based on four conceivable, single-step jump-pathways connecting one Ga(2) site to neighboring Ga(2) sites was developed and used to fit PAC spectra. The four pathways lead to two observable EFG reorientation rates, and these reorientation rates were found to be strongly dependent on EFG orientation. Calculations using density functional theory were used to reduce the number of unknowns in the model with respect to EFG orientation. This made it possible to determine with reasonable precision the total jump rate of Cd among Ga(2) sites that correspond to a change in mirror plane orientation of site-symmetry. This total jump rate was found to be thermally activated with an activation enthalpy of 1.8 ±0.1 eV.

Metrics

2 Record Views

See more details

Details

Title: Site occupation of indium and jump frequencies of cadmium in FeGa3
Creators: Randal Newhouse - Washington State University
Gary S Collins - Washington State University
Matthew O Zacate - Northern Kentucky University
Publication Details: Hyperfine interactions, Vol.237(1)
Academic Unit: Physics and Astronomy, Department of
Publisher: Springer International Publishing
Identifiers: 99900646681901842
Language: English
Resource Type: Journal article