The antiferromagnetic/paramagnetic transition in mixed-spin compounds R2BaNiO5

被引：6
作者：
Alvarez, JV [1 ]
Valentí, R
机构：
[1] Univ Michigan, Dept Phys, Ann Arbor, MI 48109 USA
[2] Univ Frankfurt, Inst Theoret Phys, D-60054 Frankfurt, Germany
来源：
EUROPEAN PHYSICAL JOURNAL B | 2005年 / 44卷 / 04期
关键词：
D O I：
10.1140/epjb/e2005-00143-2
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We present an extensive Quantum Monte Carlo study of the magnetic properties of the mixed-spin quantum systems R2BaNiO5 (R= magnetic rare earth) which show coexistence of 3-dimensional magnetic long-range order with 1-dimensional quantum gap excitations. We discuss the validity of the performed simulations in the critical region and show the excellent agreement with experimental results. We emphasize the importance of quantum fluctuations contained in our study which is absent in previous mean-field-like treatments.
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收藏
页码：439 / 445
页数：7
相关论文
共 21 条
  • [11] Landau D. P., 2000, Monte Carlo Simulations in Statistical Physics, V1
  • [12] Atomic Bose-Fermi mixtures in an optical lattice
    Lewenstein, M
    Santos, L
    Baranov, MA
    Fehrmann, H
    [J]. PHYSICAL REVIEW LETTERS, 2004, 92 (05) : 4
  • [13] Heisenberg spin-1 chain in a staggered magnetic field: A density-matrix-renormalization-group study
    Lou, JZ
    Dai, X
    Qin, SJ
    Su, ZB
    Yu, L
    [J]. PHYSICAL REVIEW B, 1999, 60 (01): : 52 - 55
  • [14] Universal behavior of one-dimensional gapped antiferromagnets in a staggered magnetic field
    Maslov, S
    Zheludev, A
    [J]. PHYSICAL REVIEW LETTERS, 1998, 80 (26) : 5786 - 5789
  • [15] Polarized-neutron observation of longitudinal haldane-gap excitations in Nd2BaNiO5
    Raymond, S
    Yokoo, T
    Zheludev, A
    Nagler, SE
    Wildes, A
    Akimitsu, J
    [J]. PHYSICAL REVIEW LETTERS, 1999, 82 (11) : 2382 - 2385
  • [16] NUMERICAL RENORMALIZATION-GROUP STUDY OF LOW-LYING EIGENSTATES OF THE ANTIFERROMAGNETIC S = 1 HEISENBERG CHAIN
    WHITE, SR
    HUSE, DA
    [J]. PHYSICAL REVIEW B, 1993, 48 (06): : 3844 - 3852
  • [17] Y2BaNiO5: A nearly ideal realization of the S=1 Heisenberg chain with antiferromagnetic interactions
    Xu, GY
    DiTusa, JF
    Ito, T
    Oka, K
    Takagi, H
    Broholm, C
    Aeppli, G
    [J]. PHYSICAL REVIEW B, 1996, 54 (10) : R6827 - R6830
  • [18] OBSERVATION OF THE HALDANE-GAP IN Y2BANIO5 SINGLE-CRYSTAL
    YOKOO, T
    SAKAGUCHI, T
    KAKURAI, K
    AKIMITSU, J
    [J]. JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 1995, 64 (10) : 3651 - 3655
  • [19] Magnetic gap excitations in a one-dimensional mixed spin antiferromagnet Nd2BaNiO5
    Zheludev, A
    Tranquada, JM
    Vogt, T
    Buttrey, DJ
    [J]. PHYSICAL REVIEW B, 1996, 54 (10): : 7210 - 7215
  • [20] Experimental measurement of the staggered magnetization curve for a Haldane spin chain
    Zheludev, A
    Ressouche, E
    Maslov, S
    Yokoo, T
    Raymond, S
    Akimitsu, J
    [J]. PHYSICAL REVIEW LETTERS, 1998, 80 (16) : 3630 - 3633
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