HOME    |    BROWSE    |    SEARCH    |    SUBSCRIPTION   |    SUBMISSION    |    REGISTRATION

Quick Search:
Author: Title/Abstract: Vol./No: Page:
PTP Online Top > Supplement (2002) > No.145
| Next Article >

Prog. Theor. Phys. Supplement No.145 (2002) pp. 320-325

[ Full Text PDF : FREE ACCESS (206K) ]

Magnetic Properties of S=1/2 Heisenberg Chains with Bond Alternation and Randomness on the Strong Bonds

Kazuo Hida*

Department of Physics, Saitama University, Saitama 338-8570, Japan

(Received December 27, 2001)

Abstract:

The S=1/2 Heisenberg chains with bond alternation and randomness on the strong bonds are studied by the density matrix renormalization group method. It is assumed that the odd-th bond is antiferromagnetic with strength J and the even-th bond can take the values J A and J F (J A > J > 0 > J F) randomly. The ground state of this model interpolates between the Haldane and dimer phases via a randomness dominated intermediate phase. On the basis of the scaling of the low energy spectrum and mean field treatment of the interchain coupling, we find that the magnetic long range order is induced by randomness in the intermediate regime. In the magnetization curves, there appears a plateau at the fractional value of the saturated magnetization. The fine structures of the magnetization curves and low energy spectrum are understood using the cluster picture. The relation to the recent experiment for (CH3)2CHNH3Cu(ClxBr1-x)3 is discussed.


URL : http://ptp.ipap.jp/link?PTPS/145/320/
DOI : 10.1143/PTPS.145.320


*E-mail: hida@phy.saitama-u.ac.jp

[ Full Text PDF : FREE ACCESS (206K) ] Citation:

References:

  1. H. Manaka, I. Yamada and H. Aruga Katori, Phys. Rev. B 63 (2001), 104408, [APS]and references therein.
  2. K. Hida, cond-mat/0111521[e-print arXiv].
  3. H. Manaka, I. Yamada, N. V. Mushnikov and T. Goto, J. Phys. Soc. Jpn. 69 (2000), 675[JPSJ].
  4. S. R. White, Phys. Rev. Lett. 69 (1992), 2863[APS]; Phys. Rev. B 48 (1993), 10345[APS].
  5. K. Hida, J. Phys. Soc. Jpn. 65 (1996), 895 [JPSJ][ Errata; 65 (1996), 3412[JPSJ]].

Citing Article(s) :

  1. Journal of the Physical Society of Japan 72 (2003) pp. 688-693 :
    Random Magnetism in S=1/2 Heisenberg Chains with Bond Alternation and Randomness on the Strong Bonds
    Kazuo Hida
  2. Journal of the Physical Society of Japan 72 (2003) pp. 789-792 :
    Antiferromagnetic Order in an Ferromagnetic–Antiferromagnetic Random Alternating Quantum Spin Chain: (CH3)2CHNH3Cu(Clx Br1-x)3
    Tota Nakamura
  3. Journal of the Physical Society of Japan 72 (2003) pp. 911-915 :
    Magnetization Plateaux in Random Frustrated S=1/2 Heisenberg Chains
    Kazuo Hida

[PTP HOME] [BROWSE] [SEARCH] [SUBSCRIPTION] [SUBMISSION] [REGISTRATION]

Copyright © Progress of Theoretical Physics 2013 All rights reserved.