INCOMMENSURATE CORRELATIONS IN THE T-J AND FRUSTRATED SPIN-1/2 HEISENBERG MODELS

被引:129
作者
MOREO, A
DAGOTTO, E
JOLICOEUR, T
RIERA, J
机构
[1] CENS,DEPT PHYS THEOR,F-91191 GIF SUR YVETTE,FRANCE
[2] FAC CIENCIAS EXACTAS ROSARIO,DEPT FIS,RA-2000 ROSARIO,ARGENTINA
[3] UNIV CALIF SANTA BARBARA,INST THEORET PHYS,SANTA BARBARA,CA 93106
来源
PHYSICAL REVIEW B | 1990年 / 42卷 / 10期
关键词
D O I
10.1103/PhysRevB.42.6283
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We analyze the possible existence of incommensurate correlations in the t-J model as a function of doping and in the J1-J2-J3 spin-1/2 Heisenberg model as a function of frustration using exact diagonalization techniques on small lattices. For the t-J model we found that when holes are introduced the spin structure factor S(q) shifts the position of its maximum away from. However, we do not observe indications of the existence of long-range incommensurate order. The frustrated Heisenberg model is analyzed using spin-wave techniques. We present the phase diagram including 1/S corrections. It has special regions where there is no magnetic order that are natural candidates for new nonclassical ground states. Using a Lanczos method we study the line J3=J2/2, which is completely disordered in the spin-wave analysis for J2/J1>1/4. S(q) behaves as in the t-J model replacing doping by frustration. We also study the square of order parameters related with Néel, twisted, dimer, and chiral order. After the Néel order is destabilized by frustration, the twisted and dimer states are enhanced. On the other hand, there are no indications that the uniform or staggered chiral state can be the ground state of the frustrated Heisenberg model. © 1990 The American Physical Society.
引用
收藏
页码:6283 / 6293
页数:11
相关论文
共 57 条
[1]  
Anderson P.W., 1963, CONCEPTS SOLIDS
[2]   RESONATING VALENCE BONDS - NEW KIND OF INSULATOR [J].
ANDERSON, PW .
MATERIALS RESEARCH BULLETIN, 1973, 8 (02) :153-160
[3]  
ANNETT J, 1989, PHYS REV B, V40, P2640
[4]  
[Anonymous], UNPUB
[5]  
BEDNORZ JG, 1986, Z PHYS B, V64, P188
[6]   CONSERVING APPROXIMATIONS FOR STRONGLY CORRELATED ELECTRON-SYSTEMS - BETHE-SALPETER-EQUATION AND DYNAMICS FOR THE TWO-DIMENSIONAL HUBBARD-MODEL [J].
BICKERS, NE ;
SCALAPINO, DJ ;
WHITE, SR .
PHYSICAL REVIEW LETTERS, 1989, 62 (08) :961-964
[7]   STATIC AND DYNAMIC SPIN FLUCTUATIONS IN SUPERCONDUCTING LA2-XSRXCUO4 [J].
BIRGENEAU, RJ ;
ENDOH, Y ;
KAKURAI, K ;
HIDAKA, Y ;
MURAKAMI, T ;
KASTNER, MA ;
THURSTON, TR ;
SHIRANE, G ;
YAMADA, K .
PHYSICAL REVIEW B, 1989, 39 (04) :2868-2871
[8]   ISING TRANSITION IN FRUSTRATED HEISENBERG MODELS [J].
CHANDRA, P ;
COLEMAN, P ;
LARKIN, AI .
PHYSICAL REVIEW LETTERS, 1990, 64 (01) :88-91
[9]   POSSIBLE SPIN-LIQUID STATE AT LARGE S FOR THE FRUSTRATED SQUARE HEISENBERG LATTICE [J].
CHANDRA, P ;
DOUCOT, B .
PHYSICAL REVIEW B, 1988, 38 (13) :9335-9338
[10]   EVIDENCE FOR SUPERCONDUCTIVITY ABOVE 40 K IN THE LA-BA-CU-O COMPOUND SYSTEM [J].
CHU, CW ;
HOR, PH ;
MENG, RL ;
GAO, L ;
HUANG, ZJ ;
WANG, YQ .
PHYSICAL REVIEW LETTERS, 1987, 58 (04) :405-407