title: Low temperature high magnetic field 57Fe Mössbauer study of kinetic arrest in Ta doped HfFe2.
abstract: Low temperature high magnetic field (57)Fe Mössbauer measurements were carried out on the inter-metallic compound Hf0.77Ta0.23Fe2 by following novel paths in H-T space. The ferromagnetic (FM) fraction at 5 K and zero magnetic field is shown to depend on the cooling field, i.e., the higher the field is, the higher the FM fraction is. Mössbauer spectra collected in the presence of a 4 T magnetic field show that the antiferromagnetic (AFM) spins are canted with respect to the applied magnetic field and hence contribute to the total bulk magnetization in this compound. The data also show an induced magnetic moment even at the 2a site of the AFM phase. Mössbauer spectra collected using the CHUF (cooling and heating in un-equal magnetic fields) protocol show a reentrant transition when the sample is cooled in zero field and measured during warming in 4 T, showing the FM state as the equilibrium state. This work is the first microscopic experimental evidence for the de-vitrification of the kinetically arrested magnetic state.
authors.affiliation: UGC-DAE Consortium for Scientific Research, University Campus, Indore, India.
authors.forename: V Raghavendra
authors.initials: VR
authors.lastname: Reddy
authors.forename: R
authors.initials: R
authors.lastname: Rawat
authors.forename: Ajay
authors.initials: A
authors.lastname: Gupta
authors.forename: Pallab
authors.initials: P
authors.lastname: Bag
authors.forename: V
authors.initials: V
authors.lastname: Siruguri
authors.forename: P
authors.initials: P
authors.lastname: Chaddah