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Article: Doping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3
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TitleDoping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3
 
AuthorsSun, JR1 2
Gao, J2
Fei, Y
Li, RW1
Shen, BG1
 
KeywordsPhysics
 
Issue Date2003
 
PublisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
 
CitationPhysical Review B (Condensed Matter and Materials Physics), 2003, v. 67 n. 14, p. 144414:1-10 [How to Cite?]
DOI: http://dx.doi.org/10.1103/PhysRevB.67.144414
 
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.
 
ISSN1098-0121
2012 Impact Factor: 3.767
2012 SCImago Journal Rankings: 2.393
 
DOIhttp://dx.doi.org/10.1103/PhysRevB.67.144414
 
ISI Accession Number IDWOS:000182718400044
 
DC FieldValue
dc.contributor.authorSun, JR
 
dc.contributor.authorGao, J
 
dc.contributor.authorFei, Y
 
dc.contributor.authorLi, RW
 
dc.contributor.authorShen, BG
 
dc.date.accessioned2007-03-23T04:44:39Z
 
dc.date.available2007-03-23T04:44:39Z
 
dc.date.issued2003
 
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.
 
dc.description.naturepublished_or_final_version
 
dc.format.extent491906 bytes
 
dc.format.extent30720 bytes
 
dc.format.mimetypeapplication/pdf
 
dc.format.mimetypeapplication/msword
 
dc.identifier.citationPhysical Review B (Condensed Matter and Materials Physics), 2003, v. 67 n. 14, p. 144414:1-10 [How to Cite?]
DOI: http://dx.doi.org/10.1103/PhysRevB.67.144414
 
dc.identifier.doihttp://dx.doi.org/10.1103/PhysRevB.67.144414
 
dc.identifier.hkuros77176
 
dc.identifier.isiWOS:000182718400044
 
dc.identifier.issn1098-0121
2012 Impact Factor: 3.767
2012 SCImago Journal Rankings: 2.393
 
dc.identifier.openurl
 
dc.identifier.scopuseid_2-s2.0-0038778644
 
dc.identifier.urihttp://hdl.handle.net/10722/43382
 
dc.languageeng
 
dc.publisherAmerican Physical Society. The Journal's web site is located at http://prb.aps.org/
 
dc.rightsPhysical Review B (Condensed Matter and Materials Physics). Copyright © American Physical Society.
 
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License
 
dc.subjectPhysics
 
dc.titleDoping effects on the phase separation in perovskite La0.67-xBixCa0.33MnO3
 
dc.typeArticle
 
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<contributor.author>Fei, Y</contributor.author>
<contributor.author>Li, RW</contributor.author>
<contributor.author>Shen, BG</contributor.author>
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<description.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 &#8764;120 K and &#8764;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 &#8764;100 neighboring unit cells, for the high-moment state, and &#8764;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 &#8764;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 &#8764;4.6% Bi. In contrast, both Cr doping and magnetic field promote the FM order. 1% Cr correspond to a field of &#8764;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 &#8764;0.96 meV/Mn and &#8764;1.3 meV/Mn, respectively.</description.abstract>
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Author Affiliations
  1. Institute of Physics Chinese Academy of Sciences
  2. The University of Hong Kong