Ni Impurity Effect on Antiferromagnetic Order in Hole-doped La_<2-x>Sr_xCuO_4(Condensed Matter : Electronic Structure, Electrical, Magnetic and Optical Properties)

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概要

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• The doping effect of magnetic impurities on the lightly hole-doped antiferromagnetic state was investigated by neutron diffraction techniques using single crystals of La_<1.99>Sr_<0.01>Cu_<1-y>Ni_yO_4 (0.01≤y≤0.10). Dilute Ni-doping between y=0.02 and 0.05 dramatically changes the Q-dependence of the antiferromagnetic Bragg intensity, corresponding to a switch of spin structure from the La_2CuO_4 type (Cu type) to the La_2NiO_4 type (Ni type) triggered by a spin rotation in CuO_2 planes. Upon Ni-doping, the Neel temperature (T_N) increases and rapidly approaches that of nondoped La_2CuO_4 in the Cu-type phase due to the strong localization of doped carriers, whereas T_N gradually decreases in the Ni-type phase. More interestingly, between the Cu- and Ni-type structures, there exists an intermediate region where the spin direction is between those of Cu- and Ni-types. In this region, we found an unusual temperature dependence of magnetic intensities, which suggests a temperature dependence of the spin direction. These unusual behaviors are discussed in terms of doped carrier itinerancy.

• 社団法人日本物理学会の論文
• 2005-08-15

著者

• ITOH Y.

  Department of Chemistry, Graduate School of Science, Kyoto University

• Machi T.

  Superconductivity Research Laboratory

• Machi T.

  Superconductivity Research Laboratory International Superconductivity Technology Center

• HIRAKA H.

  Institute for Materials Research, Tohoku University, Katahira

• WATANABE N.

  Superconductivity Research Laboratory, International Superconductivity Technology Center

• MATSUDA M.

  Advanced Science Research Center, Japan Atomic Energy Research Institute

• YAMADA K.

  Institute for Materials Research, Tohoku University, Katahira

• MACHI T.

  Superconductivity Research Laboratory, International Superconductivity Technology Center

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