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Title: Spin–glass transition in La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.5−x}Al{sub x}O{sub 3−δ} perovskites

Abstract

Graphical abstract: In-phase and out-of-phase ac susceptibility measurements at the magnetic field 1000 Oe show the shifting of transition temperature with frequency (i.e. spin–glass transition) in La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.3}Al{sub 0.2}O{sub 3−δ}. - Highlights: • Spin–glass transition at low temperature (around 50 K). • Al-doping decreases the antiferromagnetic transition temperature. • Ferromagnetic around room temperature. - Abstract: The structural and magnetic properties of the Al-doped La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.5−x}Al{sub x}O{sub 3−δ} (x = 0.0, 0.1, 0.2, 0.3) were investigated by X-ray powder diffraction, neutron powder diffraction and magnetization measurements. Rietveld refinement of the diffraction data confirms that the compounds crystallize in rhombohedral symmetry (space group, R-3C). Unit cell volume decreases with increasing concentration of Al at the B-site. Upon cooling from room temperature, we have observed multiple magnetic phase transitions, i.e. paramagnetic (PM), ferromagnetic (FM), antiferromagnetic (AFM) and spin–glass (SG), in the samples. A low temperature magnetic hysteresis study demonstrates the presence of ferromagnetic domains for all compositions. The antiferromagnetic transition temperature decreases with the Al-doping AC susceptibility measurements at 97 Hz and 1 Oe show SG behaviors with a spin-freezing temperature close to 50 K for all samples. The in-phase ac susceptibility (χ{sup /}) decreases in magnitudemore » and spin–glass transition (T{sub SG}) increase toward higher temperature with increasing frequency. The spin–glass behavior accompanied by the anomalous magnetic transitions is due to the competing interactions between FM and AFM. The results also shows that a part of the samples lose magnetic order to form a SG state accompanied by an AFM state at low temperature.« less

Authors:
 [1];  [2]
  1. Centre for Science at Extreme Conditions, University of Edinburgh, Erskine Building, Edinburgh EH9 3JZ (United Kingdom)
  2. School of Chemistry, University of St. Andrews, Fife KY16 9ST (United Kingdom)
Publication Date:
OSTI Identifier:
22290458
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 48; Journal Issue: 7; Other Information: Copyright (c) 2013 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; ATOMIC FORCE MICROSCOPY; DOPED MATERIALS; MAGNETIC MATERIALS; MAGNETIC PROPERTIES; NEUTRON DIFFRACTION; PEROVSKITES; SPACE GROUPS; TRANSITION TEMPERATURE; TRIGONAL LATTICES; X-RAY DIFFRACTION

Citation Formats

Azad, Abul K., E-mail: aka7@st-andrews.ac.uk, Sanchez-Benitez, Javier, and Irvine, John T.S. Spin–glass transition in La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.5−x}Al{sub x}O{sub 3−δ} perovskites. United States: N. p., 2013. Web. doi:10.1016/J.MATERRESBULL.2013.03.005.
Azad, Abul K., E-mail: aka7@st-andrews.ac.uk, Sanchez-Benitez, Javier, & Irvine, John T.S. Spin–glass transition in La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.5−x}Al{sub x}O{sub 3−δ} perovskites. United States. https://doi.org/10.1016/J.MATERRESBULL.2013.03.005
Azad, Abul K., E-mail: aka7@st-andrews.ac.uk, Sanchez-Benitez, Javier, and Irvine, John T.S. Mon . "Spin–glass transition in La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.5−x}Al{sub x}O{sub 3−δ} perovskites". United States. https://doi.org/10.1016/J.MATERRESBULL.2013.03.005.
@article{osti_22290458,
title = {Spin–glass transition in La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.5−x}Al{sub x}O{sub 3−δ} perovskites},
author = {Azad, Abul K., E-mail: aka7@st-andrews.ac.uk and Sanchez-Benitez, Javier and Irvine, John T.S.},
abstractNote = {Graphical abstract: In-phase and out-of-phase ac susceptibility measurements at the magnetic field 1000 Oe show the shifting of transition temperature with frequency (i.e. spin–glass transition) in La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.3}Al{sub 0.2}O{sub 3−δ}. - Highlights: • Spin–glass transition at low temperature (around 50 K). • Al-doping decreases the antiferromagnetic transition temperature. • Ferromagnetic around room temperature. - Abstract: The structural and magnetic properties of the Al-doped La{sub 0.75}Sr{sub 0.25}Mn{sub 0.5}Cr{sub 0.5−x}Al{sub x}O{sub 3−δ} (x = 0.0, 0.1, 0.2, 0.3) were investigated by X-ray powder diffraction, neutron powder diffraction and magnetization measurements. Rietveld refinement of the diffraction data confirms that the compounds crystallize in rhombohedral symmetry (space group, R-3C). Unit cell volume decreases with increasing concentration of Al at the B-site. Upon cooling from room temperature, we have observed multiple magnetic phase transitions, i.e. paramagnetic (PM), ferromagnetic (FM), antiferromagnetic (AFM) and spin–glass (SG), in the samples. A low temperature magnetic hysteresis study demonstrates the presence of ferromagnetic domains for all compositions. The antiferromagnetic transition temperature decreases with the Al-doping AC susceptibility measurements at 97 Hz and 1 Oe show SG behaviors with a spin-freezing temperature close to 50 K for all samples. The in-phase ac susceptibility (χ{sup /}) decreases in magnitude and spin–glass transition (T{sub SG}) increase toward higher temperature with increasing frequency. The spin–glass behavior accompanied by the anomalous magnetic transitions is due to the competing interactions between FM and AFM. The results also shows that a part of the samples lose magnetic order to form a SG state accompanied by an AFM state at low temperature.},
doi = {10.1016/J.MATERRESBULL.2013.03.005},
url = {https://www.osti.gov/biblio/22290458}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = 7,
volume = 48,
place = {United States},
year = {2013},
month = {7}
}