Site Dilution Study of a Square Lattice Heisenberg Antiferromagnet with S=5/2 Covering the Percolation Threshold : Condensed Matter: Electronic Properties, etc.

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概要

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• The site dilution problems on a square lattice antiferromagnet with spin S = 5/2, Mn(HCOO)_22(NH_2)_2CO (T_N = 3.77K), have been studied for a wide range of magnetic concentration x, covering the percolation threshold x_p = 0.59 for the square lattice, by the measurements of magnetic heat capacity and susceptibility. The Neel temperature T_N(x) has been found to decrease as d/dx{T_N(x)/T_N(1)} = R = 2.7 just below x = 1 for the three kinds of non-magnetic impurities, Mg^<2+>(2p^6), Zn^<2+>(3d^<10>) and Cd^<2+>(4d^<10>), at almost the same reduction rate as in the cases of the antiferromagnet K_2MnF_4 with S = 5/2 and the ferromagnet K_2CuF_4 with S = 1/2. The present value R = 2.7, however, makes a contrast to R = 3.1 for the diluted La_2CuO_4, an S = 1/2 Heisenberg antiferromagnet. The extrapolation of TN(x), with R = 2.7(3.1) down to T_N(x) = 0 gives a pseudo-critical concentration x = x_c = 0.63 (0.68) deviating from x_p = 0.59. This indicates that T_N(x) must draw concavely near T_N (x_p) = 0 at low temperatures, making a contrast to the convex curve of decreasing T_N (x) down to zero at x = x_p for Ising systems. As x decreases, dilution effects reflected on the reduction of lattice dimensionality, the Curie-Weiss temperature and the Curie constant are discussed on the base of the absolute values of the magnetic heat capacity and susceptibility. An anomalous enhancement of the heat capacities has been found in the external field of 50 kOe for the system with x = 0.12, which was theoretically reproduced by the contribution from isolated ions and clusters computer-generated on the square lattice with the same magnetic concentration.

• 社団法人日本物理学会の論文
• 2000-11-15

著者

• KAWAE Tatsuya

  Department of Applied Quantum Physics, Kyushu University

• TAKEDA Kazuyoshi

  Department of Applied Quantum Physics, Kyushu University

• Deguchi Hiroyuki

  Department of Applied Science, Faculty of Engineering, Kyushu University

• HIGUCHI Yoshihiro

  Department of Cardiovascular, Respiratory and Geriatric Medicine, Kyushu University Hospital at Bepp

• FUJITA Osamu

  Department of Physics,Aoyama-Gakuin University

• Fujita O

  Hokkaido Univ. Sapporo Jpn

• Tokita M

  Fukuoka Institute Of Technology

• Tokita Masahiko

  Fukuoka Institute Of Technology

• MITO Masaki

  Department of Electronics, Faculty of Engineering, Kyushu Institute of Technology

• Fujita O

  Kyushu Univ. Fukuoka

• YAMAGATA Kazuo

  Department of Physics,Faculty of Science,Kobe University

• KUBO Hidenori

  Fukuoka Institute of Technology

• ZENMYO Kazuko

  Fukuoka Institute of Technology

• FUJITA Osamu

  Kariya General Hospital Eastern Division

• Yamagata K

  Iwaki Meisei University

• Yamagata Kazuo

  Department Of Physics And Sciences Nihon University

• Deguchi Hiroyuki

  Department Of Applied Science Faculty Of Engineering Kyushu University

• Kawae Tatsuya

  Department Of Applied Quantum Physics Kyushu University

• Takahashi M

  Institute Of Materials Science University Of Tsukuba

• Higuchi Yoshihiro

  Department Of Applied Quantum Physics Faculty Engineering Graduate School Of Kyusyu University

• Hitaka Masako

  Department of Applied Science,Faculty of Engineering,Kyushu University

• 高橋 正雄

  神奈川工科大

• Motokawa Mitsuhiro

  Crest Japan Science And Technology:institute For Material Research Tohoku University

• MURAOKA Yoshinori

  Department of General Education, Ariake National College of Technology

• YAMAGATA Kazuo

  College of Science and Engineering, Iwaki Meisei University

• Fujita Osamu

  Department Of Physics Aoyama-gakuin University

• Masako Hitaka

  Department Of Physics Faculty Of Science And Engineering Saga University

• Kubo Hidenori

  Department Of Electronics Fukuoka Institute Of Technology

• Zenmyo Kazuko

  Department Of Physics Fukuoka Institute Of Technology

• Zenmyo Kazuko

  Fukuoka Insititute Of Technology

• Muraoka Yoshinori

  Department Of Applied Science Faculty Of Engineering 36 Kyusyu University

• 高橋 正雄

  Institute Of Materials Science University Of Tsukuba

• Fujita Osamu

  Department Of Mechanical Engineering Hokkaido University

• Fujita Osamu

  Department Of Mechanical And Space Engineering Hokkaido University

• Takeda Kazuyoshi

  Department Of Applied Quantum Physics Faculty Of Engineering Kyushu University:institute Of Environm

• Kubo H

  Fukuoka Institute Of Technology

• Zenmyo K

  Fukuoka Institute Of Technology

• Kubo Hidenori

  Fukuoka Insititute Of Technology

• Fujita Osamu

  Department of Bioresources Science and Technology, Graduate School of Biosphere Science, Hiroshima University

• Hitaka Masako

  Department of Applied Science, Faculty of Engineering, Kyushu University

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