Character of magnetic excitations in a quasi-one-dimensional antiferromagnet near the quantum critical points: Impact on magnetoacoustic properties

被引：39

作者：

Chiatti, O. ^{[1
]}

Sytcheva, A. ^{[1
]}

Wosnitza, J. ^{[1
]}

Zherlitsyn, S. ^{[1
]}

Zvyagin, A. A. ^{[2
,3
]}

Zapf, V. S. ^{[4
]}

Jaime, M. ^{[4
]}

Paduan-Filho, A. ^{[5
]}

机构：

[1] Forschungszentrum Dresden Rossendorf, Hochfeld Magnetlabor Dresden HLD, D-01314 Dresden, Germany

[2] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[3] NAS Ukraine, B Verkin Inst Low Temp Phys & Engn, UA-61103 Kharkov, Ukraine

[4] Los Alamos Natl Lab, Natl High Magnet Field Lab, Los Alamos, NM 87545 USA

[5] Univ Sao Paulo, Inst Fis, BR-05315970 Sao Paulo, Brazil

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.78.094406

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report results of magnetoacoustic studies in the quantum spin-chain magnet NiCl2-4SC(NH2)(2) (DTN) having a field-induced ordered antiferromagnetic (AF) phase. In the vicinity of the quantum critical points (QCPs) the acoustic c(33) mode manifests a pronounced softening accompanied by energy dissipation of the sound wave. The acoustic anomalies are traced up to T > T-N, where the thermodynamic properties are determined by fermionic magnetic excitations, the "hallmark" of one-dimensional (1D) spin chains. On the other hand, as established in earlier studies, the AF phase in DTN is governed by bosonic magnetic excitations. Our results suggest the presence of a crossover from a 1D fermionic to a three-dimensional bosonic character of the magnetic excitations in DTN in the vicinity of the QCPs.

引用

页数：5

共 14 条

[1] Field dependence of the intrinsic domain magnetization of a ferromagnet [J].

Holstein, T ;

Primakoff, H .

PHYSICAL REVIEW, 1940, 58 (12) :1098-1113

[2] Field-induced long-range ordering in an S=1 quasi-one-dimensional Heisenberg antiferromagnet -: art. no. 064420 [J].

Honda, Z ;

Katsumata, K ;

Nishiyama, Y ;

Harada, I .

PHYSICAL REVIEW B, 2001, 63 (06)

[3]

Luthi B., 2005, PHYS ACOUSTICS SOLID

[4] Universal temperature dependence of the magnetization of gapped spin chains [J].

Maeda, Yoshitaka ;

Hotta, Chisa ;

Oshikawa, Masaki .

PHYSICAL REVIEW LETTERS, 2007, 99 (05)

[5] Field-induced magnetic ordering in NiCl2•4SC(NH2)2 -: art. no. 020405 [J].

Paduan, A ;

Gratens, X ;

Oliveira, NF .

PHYSICAL REVIEW B, 2004, 69 (02)

[6] Bose-Einstein condensation of magnons in Cs2CuCl4 -: art. no. 127202 [J].

Radu, T ;

Wilhelm, H ;

Yushankhai, V ;

Kovrizhin, D ;

Coldea, R ;

Tylczynski, Z ;

Lühmann, T ;

Steglich, F .

PHYSICAL REVIEW LETTERS, 2005, 95 (12)

[7] Inelastic-neutron-scattering investigation of the spin-peierls system CuGeO3 [J].

Regnault, LP ;

Ain, M ;

Hennion, B ;

Dhalenne, G ;

Revcolevschi, A .

PHYSICAL REVIEW B, 1996, 53 (09) :5579-5597

[8] Bose-Einstein condensation of the triplet states in the magnetic insulator TlCuCl3 [J].

Rüegg, C ;

Cavadini, N ;

Furrer, A ;

Güdel, HU ;

Krämer, K ;

Mutka, H ;

Habicht, AK ;

Vorderwisch, P ;

Wildes, A .

NATURE, 2003, 423 (6935) :62-65

[9] Dimensional reduction at a quantum critical point [J].

Sebastian, S. E. ;

Harrison, N. ;

Batista, C. D. ;

Balicas, L. ;

Jaime, M. ;

Sharma, P. A. ;

Kawashima, N. ;

Fisher, I. R. .

NATURE, 2006, 441 (7093) :617-620

[10] EFFECT OF MAGNETIC-FIELD ON SOUND-PROPAGATION NEAR MAGNETIC PHASE-TRANSITION TEMPERATURES [J].

TACHIKI, M ;

MAEKAWA, S .

PROGRESS OF THEORETICAL PHYSICS, 1974, 51 (01) :1-25

← 1 2 →