Reinvestigation of Simultaneous Magnetic and Ferroelectric Phase Transitions in YMn_2O_5(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• Magnetic ordering around the ferroelectric transition temperature T_<Cl> of weakly ferroelectric YMn_2O_5 has been reinvestigated by single-crystal neutron diffraction and dielectric measurements. Besides a two-dimensionally modulated incommensurate magnetic (2D-ICM) phase with the propagation vector q=(q_x, 0, q_z) and a lock-in commensurate magnetic (CM) one with q=(1/2, 0, 1/4) reported previously, we observed a 1D-ICM phase characterized by q=(q_x, 0, 1/4) with q_x〜0.492 that appears in a narrow temperature interval of 〜1K and separates the 2D-ICM and CM phases. Corresponding to the 2D-ICM-to-1D-ICM and 1D-ICM-to-CM phase transitions at T=40.8K and 40.0K, a sharp peak and a shoulder in the dielectric constant along the b-axis were detected. These results suggest that the ferroelectricity appears simultaneously with the magnetic phase transition from the 2D-ICM to 1D-ICM phase in YMn_2O_5.

• 社団法人日本物理学会の論文
• 2004-06-15

著者

• 野田 幸男

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• 野田 幸男

  阪大基礎工

• KAGOMIYA Isao

  Department of Physics, School of Science and Engineering, Waseda University

• KIMURA Hiroyuki

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• NODA Yukio

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• KOHN Kay

  Department of Physics, Waseda University

• Hiroyuki Kimura

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• Kimura Hiroyuki

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• OSAWA Toshihiro

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• KOBAYASHI Satoru

  Institute of Multidisciplinary Research for Advanced Materials, Tohoku University

• 木村 初男

  名古屋大学

• Kohn K

  Department Of Physics Waseda University

• KIMURA Hidekazu

  Department of Physics,Faculty of Science,Okayama University

• Kimura Hiroyuki

  Tohoku Univ. Sendai

• Kohn Kay

  Department Of Applied Physics School Of Science And Engineering Waseda University

• Noda Yukio

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• Noda Yukio

  Faculty Of 1engineering Sciences Osaka University

• Noda Yukiko

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• Noda Yukio

  Laboratory Of Soil Science Faculty Of Agriculture Kobe University

• Kobayashi S

  Non Destructive Evaluation And Science Research Center Faculty Of Engineering Iwate University

• Kagomiya Isao

  Materials Sci. And Engineering Nagoya Inst. Of Technol.

• Kagomiya I

  Advanced Research Center Of Science And Engineering Waseda University : (present Address)national In

• Kagomiya Isao

  Department Of Physics School Of Science And Engineering Waseda University:(present Office)department

• Kagomiya Isao

  Department Of Applied Physics School Of Science And Engineering Waseda University:(present Address)m

• Kagomiya Isao

  Advanced Research Center Of Science And Engineering Waseda University

• Kobayashi Shunsuke

  Department Of Electronic Engineering (div. Of Engineering Sciences) Faculty Of Technology Tokyo Univ

• NODA Yasuhisa

  Sendai National College of Technology

• SAITO Kazuhiro

  Tochigi Research Laboratories of Kao Corporation

• Osawa Toshihiro

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• Kobayashi Satoru

  Non Destructive Evaluation And Science Research Center Faculty Of Engineering Iwate University

• Kobayashi Shunsuke

  Science University Of Tokyo

• 木村 初男

  Institute Of Materials Structure Science High Energy Accelerator Research Organization (kek)

• Kohan Kay

  Department Of Physics Waseda University

• Kobayashi Shun-ichi

  Department Of Physics School Of Science University Of Tokyo

• Kohn Key

  Department Of Physics Waseda University

• Kobayashi Shunichi

  Department Of Physics Graduate School Of Science The University Of Tokyo

• Kobayashi Satoru

  Institute For Plasma Research University Of Maryland

• Osawa T

  Institute Of Multidisciplinary Research For Advanced Materials Tohoku University

• Noda Yukio

  Tohoku Univ. Sendai

• NODA Yukio

  Institute of Multidisciplinary Research for Advanced Materials

• KOBAYASHI Shun-ichi

  Faculty of Engineering Science, Osaka University:(Present address)Department of Physics, University of Tokyo

• KOBAYASHI Shun-ichi

  Department of Physics, University of Tokyo

• Kimura Hiroyuki

  Institute for Protein Research, Osaka University

• Kobayashi Shunichi

  Department of Physics, Faculty of Science, University of Tokyo

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