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Magnetic clusters on the verge of long range ferromagnetism in Lu(Fe 0.75 Al 0.25 ) 2 and Lu(Fe 0.50 Al 0.50 ) 2 alloys

DOI: 10.1016/j.jallcom.2016.10.181 DOI Help

Authors: C. Piquer (Universidad de Zaragoza) , L. Fernández Barquín (Universidad de Cantabria) , J. Chaboy (University of Zaragoza) , D. Alba-venero (Universidad de Zaragoza; Universidad de Cantabria; ISIS) , M. A. Laguna-marco (Universidad de Zaragoza) , R. Boada (Diamond Light Source) , J. Sánchez-marcos (Universidad Autónoma de Madrid) , I. Puente-orench (Universidad de Zaragoza; Institut Laue-Langevin)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Journal Of Alloys And Compounds , VOL 695 , PAGES 704 - 714

State: Published (Approved)
Published: February 2017

Abstract: Lu(Fe0.75Al0.25)2 and Lu(Fe0.50Al0.50)2 alloys have been produced by arc-melting. DC and AC magnetization, Mössbauer spectroscopy, specific heat and neutron diffraction experiments have been performed to determine their magnetic ground state. DC magnetization curves measured at low fields (H < 1 kOe) evidence two peaks, at TSRO and Tf, and magnetic irreversibility. The peak at TSRO vanishes and the one at Tf smears out when high fields (H ≥ 1 kOe) are applied. The thermal variation of AC susceptibility shows that both transitions at TSRO and Tf are frequency dependent. Neither magnetic splitting nor broadening is observed in the Mössbauer spectra of both compounds in the Tf < T < TSRO thermal range. A magnetically split spectrum is only observed in Lu(Fe0.75Al0.25)2 for T < Tf. The absence of long range ferromagnetic order in both alloys is confirmed by specific heat and neutron diffraction measurements. The overall interpretation points to a clustered magnetic environment due to the random positions of Fe atoms in the crystallographic cell. At TSRO a short range ferromagnetic order takes place within the clusters, which become frustrated at Tf, when the random anisotropy of the clusters enables their freezing.

Journal Keywords: Intermetallic compounds; Laves phases; Magnetic measurements; Mössbauer spectroscopy; Cluster spin-glass behavior; Short-range ferromagnetic order

Subject Areas: Physics, Materials


Technical Areas: