Y2BaNiO5: A nearly ideal realization of the S=1 Heisenberg chain with antiferromagnetic interactions

被引：123

作者：

Xu, GY ^{[4
]}

DiTusa, JF

Ito, T

Oka, K

Takagi, H

Broholm, C

Aeppli, G

机构：

[1] LOUISIANA STATE UNIV, DEPT PHYS & ASTRON, BATON ROUGE, LA 70803 USA

[2] ELECTROTECH LAB, TSUKUBA, IBARAKI 305, JAPAN

[3] UNIV TOKYO, INST SOLID STATE PHYS, TOKYO 106, JAPAN

[4] JOHNS HOPKINS UNIV, DEPT PHYS & ASTRON, BALTIMORE, MD 21218 USA

[5] NATL INST STAND & TECHNOL, GAITHERSBURG, MD 20899 USA

[6] NEC RES INST, PRINCETON, NJ 08540 USA

来源：

PHYSICAL REVIEW B | 1996年 / 54卷 / 10期

关键词：

D O I：

10.1103/PhysRevB.54.R6827

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report an inelastic-neutron-scattering experiment on single crystals of the one-dimensional spin-one antiferromagnet Y2BaNiO5. The data show that this compound is a nearly ideal material for studying the Haldane conjecture in the Heisenberg limit. In particular, the Haldane gap at (q) over tilde = pi is almost isotropic, taking on the values of 7.5(1), 8.6(1), and 9.6(1) meV for polarizations parallel to the three principal orthorhombic axes respectively. Interchain coupling along the edges of the orthorhombic unit cell is found to be very weak (J'/J less than or equal to 5 x 10(-4)). Finally, we show that defects in our sample at the 1% level cause visible broadening of the excitation at (q) over tilde = pi.

引用

页码：R6827 / R6830

页数：4

共 39 条

[1] RIGOROUS RESULTS ON VALENCE-BOND GROUND-STATES IN ANTIFERROMAGNETS [J].

AFFLECK, I ;

KENNEDY, T ;

LIEB, EH ;

TASAKI, H .

PHYSICAL REVIEW LETTERS, 1987, 59 (07) :799-802

[2] EXTENDED HEISENBERG MODELS OF ANTIFERROMAGNETISM - ANALOGIES TO THE FRACTIONAL QUANTUM HALL-EFFECT [J].

AROVAS, DP ;

AUERBACH, A ;

HALDANE, FDM .

PHYSICAL REVIEW LETTERS, 1988, 60 (06) :531-534

[3] PHASE-EQUILIBRIUM STUDY OF THE Y-BA-NI-O SYSTEM AND STRUCTURAL CHARACTERIZATION OF THE NEW QUASI-ONE-DIMENSIONAL OXIDE Y2BANIO5 [J].

BUTTREY, DJ ;

SULLIVAN, JD ;

RHEINGOLD, AL .

JOURNAL OF SOLID STATE CHEMISTRY, 1990, 88 (01) :291-302

[4] EXPERIMENTAL-EVIDENCE FOR THE HALDANE GAP IN A SPIN-1, NEARLY ISOTROPIC, ANTIFERROMAGNETIC CHAIN [J].

BUYERS, WJL ;

MORRA, RM ;

ARMSTRONG, RL ;

HOGAN, MJ ;

GERLACH, P ;

HIRAKAWA, K .

PHYSICAL REVIEW LETTERS, 1986, 56 (04) :371-374

[5] DERIVATION AND EXPERIMENTAL VERIFICATION OF NORMALIZED RESOLUTION FUNCTION FOR INELASTIC NEUTRON-SCATTERING [J].

CHESSER, NJ ;

AXE, JD .

ACTA CRYSTALLOGRAPHICA SECTION A, 1973, A 29 (MAR1) :160-169

[6] THE COMPOUND Y2BANIO5 - A NEW EXAMPLE OF A HALDANE-GAP IN A S = 1 MAGNETIC CHAIN [J].

DARRIET, J ;

REGNAULT, LP .

SOLID STATE COMMUNICATIONS, 1993, 86 (07) :409-412

[7] S(Q,OMEGA) FOR THE S = 1/2 AND S = 1 ONE-DIMENSIONAL HEISENBERG-ANTIFERROMAGNET - A QUANTUM MONTE-CARLO STUDY [J].

DEISZ, J ;

JARRELL, M ;

COX, DL .

PHYSICAL REVIEW B, 1990, 42 (07) :4869-4872

[8] PREROUGHENING TRANSITIONS IN CRYSTAL-SURFACES AND VALENCE-BOND PHASES IN QUANTUM SPIN CHAINS [J].

DENNIJS, M ;

ROMMELSE, K .

PHYSICAL REVIEW B, 1989, 40 (07) :4709-4734

[9] ONE-DIMENSIONAL SPIN FLUCTUATIONS IN A TRANSITION-METAL OXIDE [J].

DITUSA, JF ;

CHEONG, SW ;

BROHOLM, C ;

AEPPLI, G ;

RUPP, LW ;

BATLOGG, B .

PHYSICA B, 1994, 194 (pt 1) :181-182

[10] MAGNETIC AND CHARGE DYNAMICS IN A DOPED ONE-DIMENSIONAL TRANSITION-METAL OXIDE [J].

DITUSA, JF ;

CHEONG, SW ;

PARK, JH ;

AEPPLI, G ;

BROHOLM, C ;

CHEN, CT .

PHYSICAL REVIEW LETTERS, 1994, 73 (13) :1857-1860

← 1 2 3 4 →