Anil Kumar, P and Nag, A and Mathieu, R and Das, R and Ray, S and Nordblad, P and Hossain, A and Cherian, D and Venero, DA and Debeer-Schmitt, L and Karis, O and Sarma, DD (2020) Magnetic polarons and spin-glass behavior in insulating La1-xSrxCo O3 (x=0.125 and 0.15). In: Physical Review Research, 2 (4).
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Abstract
The evolution of magnetic polarons in Sr doped LaCoO3 (La1-xSrxCoO3) single crystal and polycrystalline samples are investigated by employing dc and ac magnetic measurement and small angle neutron scattering (SANS) techniques. The effect of magnetic field and temperature on magnetic polarons is experimentally studied for La0.875Sr0.125CoO3 and La0.85Sr0.15CoO3 compounds that belong to the spin glass insulating regime of the broader compositional phase diagram of this system. Langevin analyses of the isothermal magnetization curves in the notional paramagnetic regime prove the existence of magnetic polarons with large moments. The dc field superimposed ac susceptibility data and the analysis of the glassy dynamics prove that the size of polarons in 15 Sr doped crystal increase as the field is increased while the field effect is not visible in the 12.5 Sr doped crystal. A polycrystalline sample of La0.85Sr0.15CoO3 is analyzed by SANS experiments, which confirm nonzero correlation length at temperatures far above the macroscopic ordering temperature and hence the presence of magnetic polarons. © 2020 authors. Published by the American Physical Society.
| Item Type: | Journal Article |
|---|---|
| Publication: | Physical Review Research |
| Publisher: | American Physical Society |
| Additional Information: | The copyright for this article belongs to The Authors. |
| Keywords: | Glass; Magnetic susceptibility; Magnetism; Neutron scattering; Single crystals; Spin fluctuations; Spin glass; Strontium; Ternary alloys, Ac susceptibility; Correlation lengths; Effect of magnetic field; Isothermal magnetization curves; Magnetic polarons; Ordering temperature; Polycrystalline samples; Spin-glass behavior, Polarons |
| Department/Centre: | Division of Chemical Sciences > Solid State & Structural Chemistry Unit |
| Date Deposited: | 09 Jan 2023 09:30 |
| Last Modified: | 09 Jan 2023 09:30 |
| URI: | https://eprints.iisc.ac.in/id/eprint/78949 |
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