Proton NMR Study of Atacamite Cu

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概要

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• The proton NMR spectrum of Cu<inf>2</inf>Cl(OH)<inf>3</inf>at low temperature in zero applied field has two sharp peaks. This result means that the majority of magnetic moments order antiferromagnetically at low temperature. The magnetic structure determined by comparing the observed proton NMR spectrum with the numerical calculated ones in several magnetic models shows that the magnetic moments order ``all-in all-out'' orienting to body center. This magnetic structure is similar to antiferromagnetic pyrochlore with geometric frustration, and different from the one of atacamite Mn<inf>2</inf>Cl(OH)<inf>3</inf>, though having the same crystal structure. The magnitude of magnetic moments of Cu(I) is 1.12 \mu_{\text{B}} and Cu(II) 0.25 \mu_{\text{B}}. In increasing temperature, the number of moments deviated from ``all-in all-out'' directions becomes large. However, the clear evidence of the disordering or spin-glass moments is not detected from observed NMR spectrum.

• 2013-08-15

著者

• Tokita Masahiko

  Fukuoka Institute Of Technology

• Kawae Tatsuya

  Faculty Of Science Osaka City University

• HAGIHALA Masato

  Department of Physics, Faculty of Science and Engineering, Saga University

• Matsumura Masahiro

  Faculty Of Engineering Science Osaka University

• Zenmyo Kazuko

  Fukuoka Insititute Of Technology

• Hamasaki Tatsuichi

  Department Of Applied Physics Tokyo Institute Of Technology

• Kubo Hidenori

  Fukuoka Insititute Of Technology

• Tokita Masahiko

  Fukuoka Institute of Technology, Fukuoka 811-0295, Japan

• Zheng Xu-Gang

  Department of Physics, Saga University, Saga 840-8502, Japan

• Hamasaki Tatsuichi

  Department of Physics, Kyushu Sangyo University, Fukuoka 813-8503, Japan

• Matsumura Masahiro

  Faculty of Science, Kochi University, Kochi 780-8072, Japan

• Takeuchi Yuuki

  Faculty of Science, Kochi University, Kochi 780-8072, Japan

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