Preprint Article Version 1 This version is not peer-reviewed

Influence of Concentration Fluctuations on Relaxation Processes in Spin Glasses

Version 1 : Received: 21 June 2018 / Approved: 27 June 2018 / Online: 27 June 2018 (08:56:21 CEST)

A peer-reviewed article of this Preprint also exists.

Wagner, J.N.; Häußler, W.; Holderer, O.; Bauer, A.; Shapiro, S.M.; Böni, P. Influence of Concentration Fluctuations on Relaxation Processes in Spin Glasses. Quantum Beam Sci. 2018, 2, 26. Wagner, J.N.; Häußler, W.; Holderer, O.; Bauer, A.; Shapiro, S.M.; Böni, P. Influence of Concentration Fluctuations on Relaxation Processes in Spin Glasses. Quantum Beam Sci. 2018, 2, 26.

Journal reference: Quantum Beam Sci. 2018, 2, 26
DOI: 10.3390/qubs2040026

Abstract

Using the unique combination of atomically resolved atom probe tomography (APT) and volume averaged neutron (resonance) spin echo (NRSE and NSE) experiments, the influence of nano-scaled clusters on the spin relaxation in spin glasses was studied. For this purpose, the phase transition from the paramagnetic phase to the spin glass phase in a Fe-Cr spin glass with a composition of Fe17.8Cr82.2 was studied in detail by means of NRSE. The microstructure was characterised by APT measurements, which show local concentration fluctuations of Fe and Cr on a length scale of 2 to 5 nm, which lead i) to the coexistence of ferro- and anti-ferromagnetic clusters and ii) a change of the magnetic properties of the whole sample, even in the spin glass phase, where spins are supposed to be randomly frozen. We show that a generalized spin glass relaxation function, which was successfully used to describe the phase transition in diluted spin glasses, can also be used for fitting the spin dynamics in spin glasses with significant concentration fluctuations.

Subject Areas

spin glasses; disordered systems; magnetism; neutron spin echo

Readers' Comments and Ratings (0)

Leave a public comment
Send a private comment to the author(s)
Views 0
Downloads 0
Comments 0
Metrics 0


×
Alerts
Notify me about updates to this article or when a peer-reviewed version is published.