Electron spin resonance of defects in the Haldane system Y2BaNiO5

被引：25

作者：

Batista, CD ^{[1
]}

Hallberg, K

Aligia, AA

机构：

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 Bariloche, Rio Negro, Argentina

[2] Comis Nacl Energia Atom, Inst Balseiro, RA-8400 Bariloche, Rio Negro, Argentina

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.60.R12553

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We calculate the electron paramagnetic resonance (EPR) spectra of the antiferromagnetic spin-1 chain compound Y2BaNi1-xMgxO5 for different values oft and temperature T much lower than the Haldane gap (similar to 100 K). The low-energy spectrum of an anisotropic Heisenberg Hamiltonian, with all parameters determined from experiment, has been solved using the density-matrix renormalization-group method. The observed EPR spectra are quantitatively reproduced by this model. The presence of end-chain S = 1/2 states is clearly observed as the main peak in the spectrum and the remaining structure is completely understood. [S0163-1829(99)50742-X].

引用

页码：R12553 / R12556

页数：4

共 15 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] Specific heat of defects in the Haldane system Y2BaNiO5 [J].

Batista, CD ;

Hallberg, K ;

Aligia, AA .

PHYSICAL REVIEW B, 1998, 58 (14) :9248-9251

[3] Spin dynamics of hole-doped Y2BaNiO5 [J].

Batista, CD ;

Aligia, AA ;

Eroles, J .

EUROPHYSICS LETTERS, 1998, 43 (01) :71-76

[4] OBSERVATION OF FRACTIONAL SPIN S=1/2 ON OPEN ENDS OF S=1 LINEAR ANTIFERROMAGNETIC CHAINS - NONMAGNETIC DOPING [J].

GLARUM, SH ;

GESCHWIND, S ;

LEE, KM ;

KAPLAN, ML ;

MICHEL, J .

PHYSICAL REVIEW LETTERS, 1991, 67 (12) :1614-1617

[5] HALDANE GAPS IN A SPIN-1 HEISENBERG CHAIN WITH EASY-PLANE SINGLE-ION-ANISOTROPY [J].

GOLINELLI, O ;

JOLICOEUR, T ;

LACAZE, R .

PHYSICAL REVIEW B, 1992, 45 (17) :9798-9805

[6] 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

[7] THETA-PHYSICS AND QUANTUM SPIN CHAINS [J].

HALDANE, FDM .

JOURNAL OF APPLIED PHYSICS, 1985, 57 (08) :3359-3359

[8] EXACT DIAGONALIZATIONS OF OPEN SPIN-1 CHAINS [J].

KENNEDY, T .

JOURNAL OF PHYSICS-CONDENSED MATTER, 1990, 2 (26) :5737-5745

[9] ORDERING ENERGY LEVELS OF INTERACTING SPIN SYSTEMS [J].

LIEB, E ;

MATTIS, D .

JOURNAL OF MATHEMATICAL PHYSICS, 1962, 3 (04) :749-+

[10] EFFECTS OF EDGES IN S = 1 HEISENBERG ANTIFERROMAGNETIC CHAINS [J].

MIYASHITA, S ;

YAMAMOTO, S .

PHYSICAL REVIEW B, 1993, 48 (02) :913-919

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