Spin dynamics of hole doped Y2-xCaxBaNiO5

被引:49
作者
Dagotto, E
Riera, J
Sandvik, A
Moreo, A
机构
[1] FLORIDA STATE UNIV,NATL HIGH MAGNET FIELD LAB,TALLAHASSEE,FL 32306
[2] UNIV NACL ROSARIO,INST FIS ROSARIO,RA-2000 ROSARIO,ARGENTINA
[3] UNIV NACL ROSARIO,DEPT FIS,RA-2000 ROSARIO,ARGENTINA
关键词
D O I
10.1103/PhysRevLett.76.1731
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
We propose an electronic model for the recently discovered hole doped compound Y2-xCaxBaNiO5. From a multiband Hamiltonian with oxygen and nickel orbitals, a one band model is discussed. Holes are described using Zhang-Rice-like S = 1/2 states at the nickels propagating on a S = 1 spin chain. Using numerical techniques to calculate the dynamical spin structure factor S(q, omega) in a realistic regime of couplings, spectral weight in the Haldane gap is observed in agreement with neutron scattering data. The case of static defects relevant for Zn-doped chains is also discussed. Ferromagnetic states at high hole mobility are favored in our model, contrary to what occurs in the 1D t-J model.
引用
收藏
页码:1731 / 1734
页数:4
相关论文
共 30 条
  • [1] VALENCE BOND GROUND-STATES IN ISOTROPIC QUANTUM ANTIFERROMAGNETS
    AFFLECK, I
    KENNEDY, T
    LIEB, EH
    TASAKI, H
    [J]. COMMUNICATIONS IN MATHEMATICAL PHYSICS, 1988, 115 (03) : 477 - 528
  • [2] SYSTEMATIC DERIVATION OF A GENERALIZED T-J MODEL
    ALIGIA, AA
    SIMON, ME
    BATISTA, CD
    [J]. PHYSICAL REVIEW B, 1994, 49 (18): : 13061 - 13064
  • [3] ZHANG-RICE LOCALIZATION, QUASI-PARTICLE DISPERSIONS, AND THE PHOTOEMISSION OF NIO
    BALA, J
    OLES, AM
    ZAANEN, J
    [J]. PHYSICAL REVIEW LETTERS, 1994, 72 (16) : 2600 - 2603
  • [4] HALDANE SPIN-STATE IN Y2BA(NI, ZN OR MG)O5
    BATLOGG, B
    CHEONG, SW
    RUPP, LW
    [J]. PHYSICA B, 1994, 194 : 173 - 174
  • [5] CONSISTENT LOW-ENERGY REDUCTION OF THE 3-BAND MODEL FOR COPPER OXIDES WITH O-O HOPPING TO THE EFFECTIVE T-J MODEL
    BELINICHER, VI
    CHERNYSHEV, AL
    [J]. PHYSICAL REVIEW B, 1994, 49 (14): : 9746 - 9756
  • [6] SUPERCONDUCTIVITY IN LADDERS AND COUPLED PLANES
    DAGOTTO, E
    RIERA, J
    SCALAPINO, D
    [J]. PHYSICAL REVIEW B, 1992, 45 (10): : 5744 - 5745
  • [7] CORRELATED ELECTRONS IN HIGH-TEMPERATURE SUPERCONDUCTORS
    DAGOTTO, E
    [J]. REVIEWS OF MODERN PHYSICS, 1994, 66 (03) : 763 - 840
  • [8] DAGOTTO E, IN PRESS
  • [9] MAGNETIC AND CHARGE DYNAMICS IN A DOPED ONE-DIMENSIONAL TRANSITION-METAL OXIDE
    DITUSA, JF
    CHEONG, SW
    PARK, JH
    AEPPLI, G
    BROHOLM, C
    CHEN, CT
    [J]. PHYSICAL REVIEW LETTERS, 1994, 73 (13) : 1857 - 1860
  • [10] ELECTRONIC-STRUCTURE OF LA2-XSRXNIO4 STUDIED BY PHOTOEMISSION AND INVERSE-PHOTOEMISSION SPECTROSCOPY
    EISAKI, H
    UCHIDA, S
    MIZOKAWA, T
    NAMATAME, H
    FUJIMORI, A
    VANELP, J
    KUIPER, P
    SAWATZKY, GA
    HOSOYA, S
    KATAYAMAYOSHIDA, H
    [J]. PHYSICAL REVIEW B, 1992, 45 (21): : 12513 - 12521