^<59>Co-NMR Probe for Stepwise Magnetization and Magnetotransport in SrCo_6O_<11> with Metallic Kagome Layer and Triangular Lattice with Local Moments(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• We report on novel magnetic and electronic properties of SrCo_6O_<11> that exhibits a unique stepwise magnetization and its relevant magnetotransport phenomena investigated by the site-selective ^<59>Co nuclear magnetic resonance (NMR) at zero and applied magnetic fields. This compound is composed of three Co sites in the unit cell, i.e., Co(1) in the metallic Kagome layer, a Co(2) dimerized pillar between the layers and Co(3) in the triangular lattice. Zero-field NMR spectra have revealed that large local moments at the Co(3) sites are magnetically ordered without any trace of bulk magnetization M at zero field. The field-swept NMR spectra show that the internal hyperfine field at the Co(1) site is derived from fully polarized moments M_s at the Co(3) sites in the "1"-plateau state at fields higher than 2.5T, whereas it is partially cancelled out in the "1/3"-plateau state in which one-third of M_s is induced at intermediate fields once a small field is applied. It has been clarified from a microscopic point of view that the local moments at Co(3) site undergo a field-induced ferrimagnetic (↑↑↓)-to-ferromagnetic (↑↑↑) transition. The Co(1) Kagome layer and the dimerized pillar Co(2) site between the layers are of nonmagnetic origin, suggesting that the nearly quasi-2D metallic conductivity is dominated by nonmagnetic Co(1) and Co(2) sites. Consequently, unique magneto-transport phenomena observed in SrCo_6O_<11> are demonstrated owing to the interaction between the conduction electrons at the Co(1) and Co(2) sites and the local moments at Co(3) sites.

• 社団法人日本物理学会の論文
• 2006-09-15

著者

• 田中 紘一

  Research Reactor Institute Kyoto University

• MUKUDA Hidekazu

  Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit

• KITAOKA Yoshio

  Department of Materials Engineering Science, Graduate School of Engineering Science, Osaka Universit

• SAITO Takashi

  Institute for Chemical Research, Kyoto University

• TAKANO Mikio

  Institute for Chemical Research, Kyoto University

• SHIMAKAWA Yuichi

  Institute for Chemical Research, Kyoto University

• HARIMA Hisatomo

  Department of Physics, Faculty of Science, Kobe University

• Takagi S

  Department Of Quantum Matter Graduate School Of Advanced Sciences Of Matter Hiroshima University

• ISHIWATA Shintaro

  Institute for Chemical Research, Kyoto University

• MUKUDA Hidekazu

  Graduate School of Engineering Science, Osaka University

• Suzuki T

  Fac. Of Engineering Kyushu Inst. Of Technol. Kitakyushu 804-8550 Jpn

• Yoh Kohori

  Department Of Material Science Faculty Of Science Himeji Institute Of Technology

• Hidaka Hiroyuki

  Graduate School Of Natural Science And Technology Okayama University

• Tsutsui Satoshi

  Department Of Materials Science And Technology Iwate University

• Suzuki T

  Issp University Of Tokyo

• Mitsui T

  Crest Japan Science And Technology Agency:japan Atomic Energy Agency

• Kobayashi Y

  Department Of Physics Division Of Material Science Nagoya University

• Saito T

  Faculty Of Engineering Kyushu Institute Of Technology

• SUDA Toshimi

  The Institute of Physical and Chemical Research

• Takano M

  Institute For Chemical Research Kyoto University

• Takano M

  Kyoto Univ. Kyoto

• Takano Mikio

  Department Of Chemistry Faculty Of Science Konan University

• Takano Mikio

  Institute For Chemical Research (icr) Kyoto University

• Kitaoka Y.

  Graduate School Of Science Osaka University

• Kitaoka Yoshio

  Graduate School Of Engineering Science Osaka University

• Kitaoka Yoshio

  Department Of Material Physics Faculty Of Engineering Science Osaka University

• Harada H

  Department Of Material Physics Faculty Of Engineering Science Osaka University

• Sakurai Takahiro

  Department Of Physics Faculty Of Science Kobe University

• Shimakawa Yuichi

  Institute For Chemical Research Kyoto University

• Kubo Y

  Fundamental Research Laboratories Nec Corporation

• Harima H

  Department Of Physics Graduate School Of Science Kobe University

• Harima Hisatomo

  Graduate School Of Sciences Kobe University

• Harima Hisatomo

  Isir-sanken Osaka University

• Harima Hisatomo

  Department Of Condensed Matter Physics The Institute Of Scientific And Industrial Research Osaka Uni

• Ishiwata Shintaro

  Institute For Chemical Research Kyoto University:department Of Applied Physics Waseda University

• Suzuki T

  Graduate School Of Science And Technology Chiba University

• Koike Yoshihiro

  Advanced Science Research Center Japan Atomic Energy Research Institute

• Mukuda Hidekazu

  Department Of Materials Engineering Science Osaka University

• Haba Hiromitsu

  Graduate School Of Engineering Nagoya University

• Suzuki Taira

  Department Of Mterials Science And Technology Science University Of Tokyo

• Mukuda Hidekazu

  Department Of Materials Engineering Science Graduate School Of Engineering Science Osaka University

• Mitsui Takaya

  Crest Japan Science And Technology Agency:japan Atomic Energy Agency

• Harima Hisatomo

  College Of Integrated Arts And Sciences University Of Osaka Prefecture

• Kawasaki Y

  Department Of Quantum Materials Science University Of Tokushima

• Kitaoka Y

  Osaka Univ. Osaka Jpn

• Mukuda Hidekazu

  Graduate School Of Science Osaka University

• Harima Hisatomo

  Department Of Physics Kobe University

• Suzuki Takashi

  Institute For Solid State Physics University Of Tokyo

• Kohori Yoh

  Department Of Physics Chiba University

• Yamada Kazuyoshi

  Wpi Advanced Institute For Materials Research Tohoku University

• Saito Takashi

  Institute For Chemical Research Kyoto University

• Shimakawa Yuichi

  Kyoto Univ. Kyoto Jpn

• Yamada Kazuyoshi

  Tohoku Univ. Sendai

• HARIMA Hisatomo

  The Institute of Scientific and Industrial Research, Osaka University

• Kitaoka Yoshio

  WPI-AIMR, Tohoku University

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