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Surface phase transitions in BiFeO_3 below room temperature

机译:室温以下BiFeO_3中的表面相变

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摘要

We combine a wide variety of experimental techniques to analyze two heretofore mysterious phase transitions in multiferroic bismuth ferrite at low temperature. Raman spectroscopy, resonant ultrasound spectroscopy, electron paraelectric resonance, x-ray lattice constant measurements, conductivity and dielectric response, and specific heat and pyroelectric data have been collected for two different types of samples: single crystals and, in order to maximize surface/volume ratio to enhance surface phase transition effects, BiFeO_3 nanotubes were also studied. The transition at T = 140.3 K is shown to be a surface phase transition, with an associated sharp change in lattice parameter and charge density at the surface. Meanwhile, the 201 K anomaly appears to signal the onset of glassy behavior.
机译:我们结合各种实验技术来分析低温下多铁性铋铁氧体中两个迄今神秘的相变。已针对两种不同类型的样品收集了拉曼光谱,共振超声光谱,电子顺电共振,x射线晶格常数测量,电导率和介电响应以及比热和热电数据:单晶以及为了最大化表面/体积为了提高表面相变效果,我们还研究了BiFeO_3纳米管。 T = 140.3 K处的转变被证明是表面相变,伴随着晶格参数和表面电荷密度的急剧变化。同时,201 K异常似乎预示着玻璃态行为的开始。

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  • 来源
    《Physical review》 |2012年第18期|p.184104.1-184104.10|共10页
  • 作者单位

    Laboratoire de Physico-Chimie de l'Etat Solide, ICMMO, CNRS-UMR 8182, Bailment 410-Universite Paris-Sud XI, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France,Laboratoire Structures, Proprietes et Modelisation des Solides, CNRS-UMR8580, Ecole Centrale Paris, Grande Vote des Vignes, 92295 Chatenay-Malabry Cedex, France;

    Department of Physics, Charles University, Prague;

    Helmholtz-Zentrum Berlin fuer Materialien und Energie GMBH, Albert-Einstein-Strasse 15, 12489 Berlin, Germany,Centro Universitario de la Defensa, Ctra. De Huesca s, E-50090 Zaragoza, Spain;

    SpLine (BM25), ESRF, Grenoble, France,Instituto de Ciencia de Materiales de Madrid ICMM-CSIC, Madrid, Spain;

    Laboratoire de Physico-Chimie de l'Etat Solide, ICMMO, CNRS-UMR 8182, Bailment 410-Universite Paris-Sud XI, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France,Laboratoire Structures, Proprietes et Modelisation des Solides, CNRS-UMR8580, Ecole Centrale Paris, Grande Vote des Vignes, 92295 Chatenay-Malabry Cedex, France;

    Laboratoire Structures, Proprietes et Modelisation des Solides, CNRS-UMR8580, Ecole Centrale Paris, Grande Vote des Vignes, 92295 Chatenay-Malabry Cedex, France;

    Laboratoire Structures, Proprietes et Modelisation des Solides, CNRS-UMR8580, Ecole Centrale Paris, Grande Vote des Vignes, 92295 Chatenay-Malabry Cedex, France;

    Laboratoire de Physico-Chimie de l'Etat Solide, ICMMO, CNRS-UMR 8182, Bailment 410-Universite Paris-Sud XI, 15 rue Georges Clemenceau, 91405 Orsay Cedex, France;

    ESRF Beamline ID01, Grenoble, France;

    Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia;

    Jozef Stefan Institute, Jamova 39, Ljubljana 1000, Slovenia;

    Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA,Condensed Matter Physics and Materials Sciences Department, Brookhaven National Laboratory, Building 480, Upton, New York 11973, USA;

    Department of Chemistry, State University of New York at Stony Brook, Stony Brook, New York 11794-3400, USA,Korea Atomic Energy Research Institute (KAERI), 989-111 Daedoek-daero, Yuseong, Daejeon, Korea 305-353;

    Max Planck Institute for Microstructural Physics, Halle, Saale, Germany;

    Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge CB2 3EQ, United Kingdom;

    Department of Physics, Cavendish Laboratory, Cambridge University, Cambridge CB3 OHE, United Kingdom;

    ICREA and CIN2 (CSIC-ICN), Universitat Autonoma de Barcelona, Bellaterra 08193, Spain;

    Laboratoire Structures, Proprietes et Modelisation des Solides, CNRS-UMR8580, Ecole Centrale Paris, Grande Vote des Vignes, 92295 Chatenay-Malabry Cedex, France;

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  • 正文语种 eng
  • 中图分类
  • 关键词

    ferromagnetic, antiferromagnetic, and ferrimagnetic resonances; spin-wave resonance; phase diagrams of other materials;

    机译:铁磁;反铁磁和亚铁磁谐振;自旋波共振其他材料的相图;

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