Antiferromagnetic order in an ferromagnetic-antiferromagnetic random alternating quantum spin chain: (CH3)2CHNH 3Cu(Clx Br1-x)3

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Abstract

A possibility of the uniform antiferromagnetic order is pointed out in an S = 1/2 ferromagnetic-antiferromagnetic (F-AF) random alternating Heisenberg quantum spin chain compound: (CH3)2CHNH 3Cu(Clx Br1-x)3. The system exhibits bond alternation of strong random bonds that take ±2J and weak uniform AF bonds of -J. In pure concentration limits, the model reduces to the AF-AF alternation chain at x = 0 and to the F-AF alternation chain at x = 1. By using the nonequilibrium relaxation method of quantum Monte Carlo simulations, it is found that the uniform AF order exhibits critical behaviors in the intermediate concentration region. This explains the experimental observation of the magnetic phase transition. The present results suggest that the uniform AF order survives even in the presence of randomly located ferromagnetic bonds.

Original languageEnglish
Pages (from-to)789-792
Number of pages4
JournalJournal of the Physical Society of Japan
Volume72
Issue number4
DOIs
Publication statusPublished - 2003 Apr
Externally publishedYes

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Keywords

  • Impurity-induced magnetic order
  • Nonequilibrium relaxation method
  • Random quantum spin chain

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

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title = "Antiferromagnetic order in an ferromagnetic-antiferromagnetic random alternating quantum spin chain: (CH3)2CHNH 3Cu(Clx Br1-x)3",
abstract = "A possibility of the uniform antiferromagnetic order is pointed out in an S = 1/2 ferromagnetic-antiferromagnetic (F-AF) random alternating Heisenberg quantum spin chain compound: (CH3)2CHNH 3Cu(Clx Br1-x)3. The system exhibits bond alternation of strong random bonds that take ±2J and weak uniform AF bonds of -J. In pure concentration limits, the model reduces to the AF-AF alternation chain at x = 0 and to the F-AF alternation chain at x = 1. By using the nonequilibrium relaxation method of quantum Monte Carlo simulations, it is found that the uniform AF order exhibits critical behaviors in the intermediate concentration region. This explains the experimental observation of the magnetic phase transition. The present results suggest that the uniform AF order survives even in the presence of randomly located ferromagnetic bonds.",
keywords = "Impurity-induced magnetic order, Nonequilibrium relaxation method, Random quantum spin chain",
author = "Tota Nakamura",
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T1 - Antiferromagnetic order in an ferromagnetic-antiferromagnetic random alternating quantum spin chain

T2 - (CH3)2CHNH 3Cu(Clx Br1-x)3

AU - Nakamura, Tota

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N2 - A possibility of the uniform antiferromagnetic order is pointed out in an S = 1/2 ferromagnetic-antiferromagnetic (F-AF) random alternating Heisenberg quantum spin chain compound: (CH3)2CHNH 3Cu(Clx Br1-x)3. The system exhibits bond alternation of strong random bonds that take ±2J and weak uniform AF bonds of -J. In pure concentration limits, the model reduces to the AF-AF alternation chain at x = 0 and to the F-AF alternation chain at x = 1. By using the nonequilibrium relaxation method of quantum Monte Carlo simulations, it is found that the uniform AF order exhibits critical behaviors in the intermediate concentration region. This explains the experimental observation of the magnetic phase transition. The present results suggest that the uniform AF order survives even in the presence of randomly located ferromagnetic bonds.

AB - A possibility of the uniform antiferromagnetic order is pointed out in an S = 1/2 ferromagnetic-antiferromagnetic (F-AF) random alternating Heisenberg quantum spin chain compound: (CH3)2CHNH 3Cu(Clx Br1-x)3. The system exhibits bond alternation of strong random bonds that take ±2J and weak uniform AF bonds of -J. In pure concentration limits, the model reduces to the AF-AF alternation chain at x = 0 and to the F-AF alternation chain at x = 1. By using the nonequilibrium relaxation method of quantum Monte Carlo simulations, it is found that the uniform AF order exhibits critical behaviors in the intermediate concentration region. This explains the experimental observation of the magnetic phase transition. The present results suggest that the uniform AF order survives even in the presence of randomly located ferromagnetic bonds.

KW - Impurity-induced magnetic order

KW - Nonequilibrium relaxation method

KW - Random quantum spin chain

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