Hole Doping Effects on Spin-gapped Na_2Cu_2TeO_6 via Topochemical Na Deficiency(Condensed matter: electronic structure and electrical, magnetic, and optical properties)

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概要

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• We report the magnetic susceptibility and NMR studies of a spin-gapped layered compound Na_2Cu_2TeO_6 (the spin gap Δ〜250K), the hole doping effect on the Cu_2TeO_6 plane via a topochemical Na deficiency by soft chemical treatment, and the static spin vacancy effect by nonmagnetic impurity Zn substitution for Cu. A finite Knight shift at the ^<125>Te site was observed for pure Na_2Cu_2TeO_6. The negative hyperfme coupling constant ^<125>A_<tr> is an evidence for the existence of a superexchange pathway of the Cu-O-Te-O-Cu bond. It turned out that both the Na deficiency and Zn impurities induce a Curietype magnetism in the uniform spin susceptibility in an external magnetic field of 1T, but only the Zn impurities enhance the low-temperature ^<23>Na nuclear spin-lattice relaxation rate whereas the Na deficiency suppresses it. A spin glass behavior was observed for the Na-deficient samples but not for the Zn-substituted samples. The dynamics of the unpaired moments of the doped holes are different from that of the spin vacancy in the spin-gapped Cu_2TeO_6 planes.

• 社団法人日本物理学会の論文
• 2006-08-15

著者

• YOSHIMURA Kazuyoshi

  Department of Chemistry, Graduate School of Science, Kyoto University

• Yoshimura Kazuyoshi

  Department Of Chemistry Graduate School Of Science Kyoto University

• KATO Masaki

  Department of Chemistry, Graduate School of Science, Kyoto University

• Yoshimura Kazuyoshi

  Department Of Applied Science Tokyo Electrical Engineering College

• ITOH Yutaka

  Department of Chemistry, Graduate School of Science, Kyoto University

• Kato Masaya

  Department Of Physics Division Of Material Science Nagoya University:crest Japan Science And Technol

• Kato Masatune

  Department Of Physics Faculty Of Science Hiroshima University

• Masaki Kato

  Department Of Chemistry Graduate School Of Science Kyoto University

• Kanada Masaki

  Department Of Physics Division Of Material Science Nagoya University

• Itoh Yutaka

  Department Of Chemistry Graduate School Of Science Kyoto University

• Kimata Motoi

  The Graduate School Of Science And Technology Kobe University

• Kato M

  Toyohashi Univ. Technol. Aichi Jpn

• Kodama Masafumi

  The Graduate School Of Science And Technology Kobe University

• HIROTA Ken

  Department of Molecular Science and Technology, Faculty of Engineering, Doshisha University

• Hirota Ken

  Department Of Molecular Science And Technology Faculty Of Engineering Doshisha University

• Kato Mayumi

  Institute For Solid State Physics University Of Tokyo

• MORIMOTO Kumiko

  Department of Chemistry, Graduate School of Science, Kyoto University

• Kasai Mayumi

  Department Of Physics Division Of Material Science Nagoya University

• Kato M

  Institute For Solid State Physics University Of Tokyo

• Hirota Ken

  Department Of

• Morimoto Kumiko

  Department Of Chemistry Graduate School Of Science Kyoto University

• Kato Masaki

  Department Of Molecular Science And Technology Faculty Of Engineering Doshisha University

• Kato Masaki

  Department Of Chemical Science And Engineering Graduate School Of Engineering Science Osaka Universi

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