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Article: Doping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3

TitleDoping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3
Authors
KeywordsPhysics
Issue Date2003
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
Citation
Physical Review B (Condensed Matter and Materials Physics), 2003, v. 67 n. 14, p. 144414:1-10 How to Cite?
Abstract
Effects of Bi, Cr, and Fe doping on phase separation of La0.67Ca0.33MnO3 have been experimentally studied. As proved by the electron-spin resonance and neutron-diffraction studies, partial replacement of La by Bi causes the simultaneous occurrence of ferromagnetic (FM) phase and charge-ordered antiferromagnetic phase. As a consequence, two subsequent magnetic transitions at ∼120 K and ∼230 K are resulted. A strong coupling between the coexisted phases is assumed, which is responsible for the insensitivity of Tc(L), the higher Curie temperature, to Bi doping after the appearance of phase separation, and consistent with the discontinuous variation of Tc(L) with Cr doping. As expected, the substitution of Cr for Mn in this case promotes the FM order, but its effects are significantly different for the two magnetic states. Each Cr drives ∼100 neighboring unit cells, for the high-moment state, and ∼60 unit cells, for the low-moment state, into the FM state. Two definite processes can be identified for the melting of the charge-ordered phase. The FM fraction increases rapidly in the initial stage of Cr doping, and then slowly when the FM population exceeds ∼90%. This could be a common feature of the phase-separated system suffering from random-phase fluctuation according to a theoretical analysis. Exactly opposite effects on phase constituent are produced by Cr doping and Bi doping, and 1% Cr are equivalent to ∼4.6% Bi. In contrast, both Cr doping and magnetic field promote the FM order. 1% Cr correspond to a field of ∼4.5 T for the low-moment state and 6 T for the high-moment state, reducing the energy difference between the charge ordering and the FM states by ∼0.96 meV/Mn and ∼1.3 meV/Mn, respectively.
Persistent Identifierhttp://hdl.handle.net/10722/43382
ISSN
2013 Impact Factor: 3.664
2013 SCImago Journal Rankings: 2.143
ISI Accession Number ID

 

Author Affiliations
  1. Institute of Physics Chinese Academy of Sciences
  2. The University of Hong Kong
DC FieldValueLanguage
dc.contributor.authorSun, JRen_HK
dc.contributor.authorGao, Jen_HK
dc.contributor.authorFei, Yen_HK
dc.contributor.authorLi, RWen_HK
dc.contributor.authorShen, BGen_HK
dc.date.accessioned2007-03-23T04:44:39Z-
dc.date.available2007-03-23T04:44:39Z-
dc.date.issued2003en_HK
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2003, v. 67 n. 14, p. 144414:1-10en_HK
dc.identifier.issn1098-0121en_HK
dc.identifier.urihttp://hdl.handle.net/10722/43382-
dc.description.abstractEffects of Bi, Cr, and Fe doping on phase separation of La0.67Ca0.33MnO3 have been experimentally studied. As proved by the electron-spin resonance and neutron-diffraction studies, partial replacement of La by Bi causes the simultaneous occurrence of ferromagnetic (FM) phase and charge-ordered antiferromagnetic phase. As a consequence, two subsequent magnetic transitions at ∼120 K and ∼230 K are resulted. A strong coupling between the coexisted phases is assumed, which is responsible for the insensitivity of Tc(L), the higher Curie temperature, to Bi doping after the appearance of phase separation, and consistent with the discontinuous variation of Tc(L) with Cr doping. As expected, the substitution of Cr for Mn in this case promotes the FM order, but its effects are significantly different for the two magnetic states. Each Cr drives ∼100 neighboring unit cells, for the high-moment state, and ∼60 unit cells, for the low-moment state, into the FM state. Two definite processes can be identified for the melting of the charge-ordered phase. The FM fraction increases rapidly in the initial stage of Cr doping, and then slowly when the FM population exceeds ∼90%. This could be a common feature of the phase-separated system suffering from random-phase fluctuation according to a theoretical analysis. Exactly opposite effects on phase constituent are produced by Cr doping and Bi doping, and 1% Cr are equivalent to ∼4.6% Bi. In contrast, both Cr doping and magnetic field promote the FM order. 1% Cr correspond to a field of ∼4.5 T for the low-moment state and 6 T for the high-moment state, reducing the energy difference between the charge ordering and the FM states by ∼0.96 meV/Mn and ∼1.3 meV/Mn, respectively.en_HK
dc.format.extent491906 bytes-
dc.format.extent30720 bytes-
dc.format.mimetypeapplication/pdf-
dc.format.mimetypeapplication/msword-
dc.languageengen_HK
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/en_HK
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.en_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.subjectPhysicsen_HK
dc.titleDoping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3en_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=1098-0121&volume=67&issue=14&spage=144414:1&epage=10&date=2003&atitle=Doping+effects+on+the+phase+separation+in+perovskite+La0.67-xBixCa0.33MnO3en_HK
dc.description.naturepublished_or_final_versionen_HK
dc.identifier.doi10.1103/PhysRevB.67.144414en_HK
dc.identifier.scopuseid_2-s2.0-0038778644-
dc.identifier.hkuros77176-
dc.identifier.isiWOS:000182718400044-

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