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首页> 外文期刊>Physical review >Strain-sensitive spin-state ordering in thin films of perovskite LaCoO_3
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Strain-sensitive spin-state ordering in thin films of perovskite LaCoO_3

机译：钙钛矿LaCoO_3薄膜中的应变敏感自旋态有序

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摘要

We have investigated the lattice distortion coupled to the Co 3d-spin-state ordering in thin films of perovskite LaCoO_3 with various epitaxial strains by measurements of the magnetization, x-ray diffraction, and optical spectra. In the system with tensile strain about 0.5%, a lattice distortion characterized by the modulation vector q = (1/6,1/6,1/6) emerges at 40 K, followed by a ferromagnetic ordering at 24 K. Alternatively, in systems with tensile strain exceeding 1%, the lattice distortion characterized by q = (1/4,1/4,1/4) emerges at 120 K or higher, and subsequently the ferromagnetic or ferrimagnetic ordering occurs around 90 K. The evolution of infrared phonon spectra and resonant x-ray scattering at the Co K edge suggests that the population change in the Co 3d spin state causes the strain-induced switching of spin-state ordering as well as of magnetic ordering in this canonical spin-state crossover system.
机译：我们通过测量磁化强度，x射线衍射和光谱，研究了钙钛矿型LaCoO_3薄膜在各种外延应变下与Co 3d自旋态有序耦合的晶格畸变。在拉伸应变约为0.5％的系统中，以调制矢量q =（1 / 6,1 / 6,1 / 6）为特征的晶格畸变在40 K处出现，然后在24 K处出现铁磁有序。当系统的拉伸应变超过1％时，以q =（1 / 4,1 / 4,1 / 4）为特征的晶格畸变出现在120 K或更高，随后铁磁或亚铁磁有序出现在90 K左右。 Co K边缘的红外声子光谱和共振X射线散射表明，在该规范自旋态交叉系统中，Co 3d自旋态的种群变化导致应变诱导的自旋态有序和磁有序转换。

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  • 来源
    《Physical review》 |2015年第19期|195115.1-195115.6|共6页
  • 作者

    J. Fujioka; Y. Yamasaki; A. Doi; H. Nakao; R. Kumai; Y. Murakami; M. Nakamura; M. Kawasaki; T. Arima; Y. Tokura;

  • 作者单位

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan;

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan,Condensed Matter Research Center (CMRC) and Photon Factory, Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan,RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan;

    Condensed Matter Research Center (CMRC) and Photon Factory, Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan;

    Condensed Matter Research Center (CMRC) and Photon Factory, Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan;

    Condensed Matter Research Center (CMRC) and Photon Factory, Institute of Materials Structure Science (IMSS), High Energy Accelerator Research Organization (KEK), Tsukuba, 305-0801, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan,RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

    RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan,Department of Advanced Materials Science, University of Tokyo, Kashiwa 227-8561 Japan;

    Department of Applied Physics and Quantum-Phase Electronics Center (QPEC), University of Tokyo, Hongo, Tokyo 113-8656, Japan,RIKEN Center for Emergent Matter Science (CEMS), Wako 351-0198, Japan;

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  • 正文语种 eng
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  • 关键词

    magnetic properties of thin films, surfaces, and interfaces; infrared and raman spectra; X-ray scattering;

    机译：薄膜;表面和界面的磁性能;红外和拉曼光谱;X射线散射;

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