Influence of Concentration Fluctuations on Relaxation Processes in Spin Glasses

Quantum Beam Science

StephenM. Shapiro¹  Olaf Holderer²  Andreas Bauer³  Wolfgang Häußler³  JuliaN. Wagner³  Peter Böni³ 

[1] Brookhaven National Laboratory, Department of Physics, Upton, NY 11973, USA;Forschungszentrum Jülich GmbH, JCNS Outstation at MLZ, Lichtenbergstr. 1, 85747 Garching, Germany;Physik-Department E21, Technische Universität München, 85747 Garching, Germany;

关键词: spin glasses;    disordered systems;    magnetism;    neutron spin echo;   

DOI  :  10.3390/qubs2040026

来源: DOAJ

【 摘 要 】

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 an Fe-Cr spin glass with a composition of Fe ${}_{17.8}$ Cr ${}_{82.2}$ 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.

【 授权许可】

Unknown