OBSERVATION OF THE HALDANE-GAP IN Y2BANIO5 SINGLE-CRYSTAL

被引：54

作者：

YOKOO, T ^{[1
]}

SAKAGUCHI, T ^{[1
]}

KAKURAI, K ^{[1
]}

AKIMITSU, J ^{[1
]}

机构：

[1] UNIV TOKYO, INST SOLID STATE PHYS, MINATO KU, TOKYO 106, JAPAN

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 1995年 / 64卷 / 10期

关键词：

Y2BANIO5; HALDANE SYSTEM; HALDANE GAP; ONE-DIMENSIONAL SYSTEM; INELASTIC NEUTRON SCATTERING;

D O I：

10.1143/JPSJ.64.3651

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Magnetization measurement and inelastic neutron scattering have been performed on a single crystal of a new Haldane system Y2BaNiO5. Magnetic susceptibility shows a weak anisotropy and decreases as temperature decreases, reflecting the singlet ground state at low temperature. The energy gaps were found to be Delta(parallel to)/k(B)=118 K and Delta(perpendicular to)k(B)=104 K, parallel and perpendicular to the chain, respectively. Using inelastic neutron scattering magnetic excitations along the chain (a*-) and perpendicular (c*-) directions up to 30 meV energy transfer are studied. Energy gap of about 10 meV (116 K) is observed along the one-dimensional, antiferromagnetic zone center, in good agreement with the magnetization measurement. The observed dispersion relation in the chain direction with the gap can be well described by the exact numerical results of S=1, Heisenberg antiferromagnetic chain yielding an intrachain exchange of J/k(B)=280 +/- 10 K.

引用

页码：3651 / 3655

页数：5

共 17 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] HIGH-FIELD MAGNETIZATION OF A QUASI-ONE-DIMENSIONAL S=1 ANTIFERROMAGNET NI(C2H8N2)2NO2(CLO4) - OBSERVATION OF THE HALDANE GAP [J].

AJIRO, Y ;

GOTO, T ;

KIKUCHI, H ;

SAKAKIBARA, T ;

INAMI, T .

PHYSICAL REVIEW LETTERS, 1989, 63 (13) :1424-1427

[3] GROUND-STATE PROPERTIES OF A SPIN-1 ANTI-FERROMAGNETIC CHAIN [J].

BOTET, R ;

JULLIEN, R .

PHYSICAL REVIEW B, 1983, 27 (01) :613-615

[4] FINITE-SIZE-SCALING STUDY OF THE SPIN-1 HEISENBERG-ISING CHAIN WITH UNIAXIAL ANISOTROPY [J].

BOTET, R ;

JULLIEN, R ;

KOLB, M .

PHYSICAL REVIEW B, 1983, 28 (07) :3914-3921

[5] 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

[6] 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

[7] STRUCTURAL CHARACTERIZATION AND POLYMORPHISM OF R2BANIO5 (R = ND, GD, DY, Y, HO, ER, TM, YB) STUDIED BY NEUTRON-DIFFRACTION [J].

GARCIAMATRES, E ;

MARTINEZ, JL ;

RODRIGUEZCARVAJAL, J ;

ALONSO, JA ;

SALINASSAHCNEZ, A ;

SAEZPUCHE, R .

JOURNAL OF SOLID STATE CHEMISTRY, 1993, 103 (02) :322-333

[8] OBSERVATION OF S = 1/2 DEGREES OF FREEDOM IN AN S = 1 LINEAR-CHAIN HEISENBERG-ANTIFERROMAGNET [J].

HAGIWARA, M ;

KATSUMATA, K ;

AFFLECK, I ;

HALPERIN, BI ;

RENARD, JP .

PHYSICAL REVIEW LETTERS, 1990, 65 (25) :3181-3184

[9] NON-LINEAR FIELD-THEORY OF LARGE-SPIN HEISENBERG ANTI-FERROMAGNETS - SEMI-CLASSICALLY QUANTIZED SOLITONS OF THE ONE-DIMENSIONAL EASY-AXIS NEEL STATE [J].

HALDANE, FDM .

PHYSICAL REVIEW LETTERS, 1983, 50 (15) :1153-1156

[10] MAGNETIZATION PROCESS OF AN S=1 LINEAR-CHAIN HEISENBERG-ANTIFERROMAGNET [J].

KATSUMATA, K ;

HORI, H ;

TAKEUCHI, T ;

DATE, M ;

YAMAGISHI, A ;

RENARD, JP .

PHYSICAL REVIEW LETTERS, 1989, 63 (01) :86-88

← 1 2 →