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Title: Divergent effects of static disorder and hole doping in geometrically frustrated {beta}-CaCr{sub 2}O{sub 4}

Abstract

The gallium substituted and calcium deficient variants of geometrically frustrated {beta}-CaCr{sub 2}O{sub 4}, {beta}-CaCr{sub 2-2x}Ga{sub 2x}O{sub 4} (0.02{<=}x{<=}0.25) and {beta}-Ca{sub 1-y}Cr{sub 2}O{sub 4} (0.075{<=}y{<=}0.15), have been investigated by X-ray powder diffraction, magnetization and specific heat measurements. This allows for a direct comparison of the effects, in a geometrically frustrated magnet, of the static disorder that arises from non-magnetic substitution and the dynamic disorder that arises from hole doping. In both cases, disturbing the Cr{sup 3+} lattice results in a reduction in the degree of magnetic frustration. On substitution of Ga, which introduces disorder without creating holes, a gradual release of spins from ordered antiferromagnetic states is observed. In contrast, in the calcium-deficient compounds the introduction of holes induces static ferrimagnetic ordering and much stronger perturbations of the {beta}-CaCr{sub 2}O{sub 4} host. - Graphical abstract: Scaled plot of the temperature dependence of the inverse susceptibility for {beta}-CaCr{sub 2-2x}Ga{sub 2x}O{sub 4} (closed symbols) and {beta}-Ca{sub 1-y}Cr{sub 2}O{sub 4} (open symbols). Data sets depicted in the same color contain equivalent amounts of Cr{sup 3+}.

Authors:
 [1];  [2]
  1. Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218 (United States)
  2. Department of Chemistry, Princeton University, Princeton, NJ 08544 (United States)
Publication Date:
OSTI Identifier:
21421578
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 183; Journal Issue: 8; Other Information: DOI: 10.1016/j.jssc.2010.05.032; PII: S0022-4596(10)00235-5; Copyright (c) 2010 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; CALCIUM COMPOUNDS; CHROMATES; CHROMIUM COMPOUNDS; CHROMIUM IONS; GALLIUM COMPOUNDS; HOLES; MAGNETIC SUSCEPTIBILITY; MAGNETIZATION; OXIDES; SPECIFIC HEAT; TEMPERATURE DEPENDENCE; X-RAY DIFFRACTION; ALKALINE EARTH METAL COMPOUNDS; CHALCOGENIDES; CHARGED PARTICLES; COHERENT SCATTERING; DIFFRACTION; IONS; MAGNETIC PROPERTIES; MAGNETISM; OXYGEN COMPOUNDS; PHYSICAL PROPERTIES; SCATTERING; THERMODYNAMIC PROPERTIES; TRANSITION ELEMENT COMPOUNDS

Citation Formats

Dutton, S.E., E-mail: siandutton@cantab.ne, Broholm, C L, and Cava, R J. Divergent effects of static disorder and hole doping in geometrically frustrated {beta}-CaCr{sub 2}O{sub 4}. United States: N. p., 2010. Web. doi:10.1016/j.jssc.2010.05.032.
Dutton, S.E., E-mail: siandutton@cantab.ne, Broholm, C L, & Cava, R J. Divergent effects of static disorder and hole doping in geometrically frustrated {beta}-CaCr{sub 2}O{sub 4}. United States. doi:10.1016/j.jssc.2010.05.032.
Dutton, S.E., E-mail: siandutton@cantab.ne, Broholm, C L, and Cava, R J. Sun . "Divergent effects of static disorder and hole doping in geometrically frustrated {beta}-CaCr{sub 2}O{sub 4}". United States. doi:10.1016/j.jssc.2010.05.032.
@article{osti_21421578,
title = {Divergent effects of static disorder and hole doping in geometrically frustrated {beta}-CaCr{sub 2}O{sub 4}},
author = {Dutton, S.E., E-mail: siandutton@cantab.ne and Broholm, C L and Cava, R J},
abstractNote = {The gallium substituted and calcium deficient variants of geometrically frustrated {beta}-CaCr{sub 2}O{sub 4}, {beta}-CaCr{sub 2-2x}Ga{sub 2x}O{sub 4} (0.02{<=}x{<=}0.25) and {beta}-Ca{sub 1-y}Cr{sub 2}O{sub 4} (0.075{<=}y{<=}0.15), have been investigated by X-ray powder diffraction, magnetization and specific heat measurements. This allows for a direct comparison of the effects, in a geometrically frustrated magnet, of the static disorder that arises from non-magnetic substitution and the dynamic disorder that arises from hole doping. In both cases, disturbing the Cr{sup 3+} lattice results in a reduction in the degree of magnetic frustration. On substitution of Ga, which introduces disorder without creating holes, a gradual release of spins from ordered antiferromagnetic states is observed. In contrast, in the calcium-deficient compounds the introduction of holes induces static ferrimagnetic ordering and much stronger perturbations of the {beta}-CaCr{sub 2}O{sub 4} host. - Graphical abstract: Scaled plot of the temperature dependence of the inverse susceptibility for {beta}-CaCr{sub 2-2x}Ga{sub 2x}O{sub 4} (closed symbols) and {beta}-Ca{sub 1-y}Cr{sub 2}O{sub 4} (open symbols). Data sets depicted in the same color contain equivalent amounts of Cr{sup 3+}.},
doi = {10.1016/j.jssc.2010.05.032},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = 8,
volume = 183,
place = {United States},
year = {2010},
month = {8}
}