Indications of phase separation in polycrystalline <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi mathvariant="normal">La</mi></mrow><mrow><mn>1</mn><mi>−</mi><mi>x</mi></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">Sr</mi></mrow><mrow><mi>x</mi></mrow></msub></mrow><mrow><msub><mrow><mi mathvariant="normal">MnO</mi></mrow><mrow><mn>3</mn></mrow></msub></mrow></math></span> for <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>x</mi><mi>≈</mi><mn>0.5</mn></math></span>

S. I. Patil; S. M. Bhagat; Q. Q. Shu; S. E. Lofland; S. B. Ogale; V. N. Smolyaninova; X. Zhang; B. S. Palmer; R. S. Decca; F. A. Brown; H. D. Drew; R. L. Greene; I. O. Troyanchuk; W. H. McCarroll

doi:10.1103/PhysRevB.62.9548

Indications of phase separation in polycrystalline ${La}_{1 - x} {Sr}_{x} {MnO}_{3}$ for $x \approx 0.5$

S. I. Patil, S. M. Bhagat, Q. Q. Shu, S. E. Lofland, S. B. Ogale, V. N. Smolyaninova, X. Zhang, B. S. Palmer, R. S. Decca, F. A. Brown, H. D. Drew, R. L. Greene, I. O. Troyanchuk, and W. H. McCarroll

Phys. Rev. B 62, 9548 – Published 1 October 2000

Abstract

We present systematic studies of polycrystalline ${La}_{1 - x} {Sr}_{x} {MnO}_{3}$ where x is varied from 0.46 to 0.53 at 0.01 intervals. We have measured the magnetic resonance, ac susceptibility, dc magnetization, x-ray diffraction, four-probe resistivity, and optical reflectivity. The data seem to indicate that, at low T, the materials are intimate mixtures of ferromagnetic and antiferromagnetic microregions. For $x > 0.48$ we observe anomalies pointing toward charge ordering on lowering T. An effective-medium theory is presented, and an appropriate phase diagram is proposed.

Received 20 August 1999

DOI:https://doi.org/10.1103/PhysRevB.62.9548

Authors & Affiliations

S. I. Patil^*, S. M. Bhagat, Q. Q. Shu^†, S. E. Lofland^‡, S. B. Ogale, V. N. Smolyaninova, X. Zhang, B. S. Palmer, R. S. Decca, F. A. Brown^§, H. D. Drew, and R. L. Greene

Department of Physics, University of Maryland, College Park, Maryland 20742-4111

I. O. Troyanchuk

National Academy of Science of Belarus, Institute of Solid State Physics, P. Brovki 17, Minsk 220072, Belarus

W. H. McCarroll

Department of Chemistry and Biochemistry, Rider University, Lawrenceville, New Jersey 08648-3099

^*Present address: Department of Physics, University of Pune, Pune 411007, India.
^†Present address: Department of Material Science and Engineering, Shenzhen University, Shenzhen, Guangdong 518060, China.
^‡Also at Department of Chemistry and Physics, Rowan University, Glassboro, NJ 08028-1701.
^§Present address: Rochester Institute of Technology, Rochester, NY 14623.

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Vol. 62, Iss. 14 — 1 October 2000

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