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Anomalous Magnetic Properties in LaFe11.5Al1.5

Abstract

We account the magnetic relaxation, dc magnetization, heat capacity, and the studies of X-ray powder diffraction for melt-spun LaFe11.5Al1.5 compound executed in a range of temperatures from 5K to 300K. We have found three magnetic transitions (at temperatures T1, T2, and Tord) in this compound in the zero-field cooled (ZFC) mode, and two magnetic transitions (at T2 and Tord) in field-cooled cooling/warming (FCC/FCW) mode. The ferromagnetic transition (FM) at temperature T2 enunciating a hysteresis alludes to a magnetic transition of first-order (FOT) at lower temperatures. The magnetization study reveals that meta-stable states exist in the low-temperature antiferromagnetically ordered state. A partially reversible behavior is also observed in the 120-140 K temperature range. The heat capacity data exhibits that the magnetic state of this compound is clearly different from that of the spin-glasses. The magnetocaloric properties of the compound are determined in the form of the isothermal magnetic entropy change (∆SM) and the adiabatic temperature change (∆Tad) and observed the utmost value of ∆SM and ∆Tad for a field variation of 25 kOe to be 3.1 J/kg K and 1.12 K respectively. The RCP is ascertained to be 216 J/kg for an enforced field of 25 kOe.

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Article information


Submitted
11 Dec 2019
Accepted
13 Jan 2020
First published
13 Jan 2020

Phys. Chem. Chem. Phys., 2020, Accepted Manuscript
Article type
Paper

Anomalous Magnetic Properties in LaFe11.5Al1.5

S. Sharma, F. Ahmad, A. Singh, A. K. Patel and P. Kumar, Phys. Chem. Chem. Phys., 2020, Accepted Manuscript , DOI: 10.1039/C9CP06670E

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