Evolution of Magnetotransport Properties and Spin-Glass Behavior of the La_<0.7-x>Nd_xPb_<0.3>MnO_3 System : Magnetism

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概要

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• The effect of neodymium substitution on the lanthanum site in La_<0.7-x>Nd_xPb_<0.3>MnO_3 perovskite polycrystalline has been systematically studied. The substitution of neodymium for lanthanum causes structure change from rhombohedral to orthorhombic. Ferromagnetism is suppressed as neodymium content increases. The magnetic order changes from a ferromagnetic long-range order with x = 0.0 to a spin-glass nature with x = 0.7. Besides, the ferromagnetic-paramagnetic transition temperature values are lower for the neodymium phases than for the lanthanum ones. Therefore, the introduction of neodymium degrades symmetry of the structure, diminishes the spin-coupling exchange interaction, and results in changes of magnetic properties. This fact is in good agreement with increasing the B value in Bloch's T^<3/2> law and decreasing the spin-wave stiffness parameter D in quadratic dispersion relation.

• 社団法人応用物理学会の論文
• 2001-08-15

著者

• HORNG Lance

  Department of Physics, National Changhua University of Education

• CHEN Y.

  Department of Chemical and Materials Engineering, National Central University

• Horng L

  National Changhua Univ. Eduction Changhua Twn

• Horng Lance

  Department Of Physics National Changhua University Of Education

• SHI J.

  Department of Physics, National Tsing Hua University

• CHEN H.

  Department of Electrical Engineering, University of Maryland Baltimore County

• Shi J.

  Department Of Electronic Engineering Feng-chia University

• YOUNG S.

  Department of Electrical Engineering, National Sun Yat-Sen University

• Chen Y.

  Department Of Electrical Engineering National Sun Yat-sen University

• Young S.L.

  Department of Electrical Engineering, National Sun Yat-Sen University

• Chen H.Z.

  Department of Electrical Engineering, Hsiuping Institute of Technology

• CHEN Y.

  Department of Applied Analysis, State University of New York

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