Unconventional spin freezing and fluctuations in the frustrated antiferromagnet NiGa2S4

被引：35

作者：

MacLaughlin, D. E. ^{[1
]}

Nambu, Y. ^{[2
]}

Nakatsuji, S. ^{[2
]}

Heffner, R. H. ^{[3
,4
]}

Shu, Lei ^{[1
]}

Bernal, O. O. ^{[5
]}

Ishida, K. ^{[6
]}

机构：

[1] Univ Calif Riverside, Dept Phys & Astron, Riverside, CA 92521 USA

[2] Univ Tokyo, Inst Solid State Phys, Kashiwa, Chiba 2778581, Japan

[3] Japan Atom Energy Agcy, Adv Sci Res Ctr, Tokai, Ibaraki 3191195, Japan

[4] Los Alamos Natl Lab, Los Alamos, NM 87545 USA

[5] Calif State Univ Los Angeles, Dept Phys & Astron, Los Angeles, CA 90032 USA

[6] Kyoto Univ, Grad Sch Sci, Dept Phys, Kyoto 6068502, Japan

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 22期

基金：

美国国家科学基金会;

关键词：

antiferromagnetic materials; gallium compounds; magnetic transitions; muon probes; nickel compounds; spin fluctuations;

D O I：

10.1103/PhysRevB.78.220403

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Muon spin rotation (mu SR) experiments reveal unconventional spin freezing and dynamics in the two-dimensional (2D) triangular lattice antiferromagnet NiGa2S4. Long-lived disordered Ni-spin freezing (correlation time greater than or similar to 10(-6) s at 2 K) sets in below T-f=8.5 +/- 0.5 K with a mean-field-like temperature dependence. The observed exponential temperature dependence of the muon spin relaxation above T-f is strong evidence for 2D critical spin fluctuations. Slow Ni-spin fluctuations coexist with quasistatic magnetism at low temperatures but are rapidly suppressed for fields greater than or similar to 10 mT, in marked contrast with the field-independent specific heat. The mu SR and bulk susceptibility data indicate a well-defined 2D phase transition at T-f, below which NiGa2S4 is neither a conventional magnet nor a singlet spin liquid.

引用

页数：4

共 20 条

[1] Dynamics in pure and substituted volborthite kagome-like compounds [J].

Bert, F ;

Mendels, P ;

Bono, D ;

Olariu, A ;

Ladieu, F ;

Trombe, JC ;

Duc, F ;

Baines, C ;

Amato, A ;

Hillier, A .

PHYSICA B-CONDENSED MATTER, 2006, 374 :134-137

[2]

Brewer J.H., 1994, ENCY APPL PHYS, V11, P23, DOI 10.1002/3527600434.eap258

[3] TWO-DIMENSIONAL QUANTUM HEISENBERG-ANTIFERROMAGNET AT LOW-TEMPERATURES [J].

CHAKRAVARTY, S ;

HALPERIN, BI ;

NELSON, DR .

PHYSICAL REVIEW B, 1989, 39 (04) :2344-2371

[4] ZERO-FIELD AND LOW-FIELD SPIN RELAXATION STUDIED BY POSITIVE MUONS [J].

HAYANO, RS ;

UEMURA, YJ ;

IMAZATO, J ;

NISHIDA, N ;

YAMAZAKI, T ;

KUBO, R .

PHYSICAL REVIEW B, 1979, 20 (03) :850-859

[5] Vortex-induced topological transition of the bilinear-biquadratic heisenberg antiferromagnet on the triangular lattice [J].

Kawamura, Hikaru ;

Yamamoto, Atsushi .

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN, 2007, 76 (07)

[6] Probing the spin-spin dynamical autocorrelation function in a spin glass above T-g via muon spin relaxation [J].

Keren, A ;

Mendels, P ;

Campbell, IA ;

Lord, J .

PHYSICAL REVIEW LETTERS, 1996, 77 (07) :1386-1389

[7] Muon-spin-rotation measurements in the kagome lattice systems: Cr-jarosite and Fe-jarosite [J].

Keren, A ;

Kojima, K ;

Le, LP ;

Luke, GM ;

Wu, WD ;

Uemura, YJ ;

Takano, M ;

Dabkowska, H ;

Gingras, MJP .

PHYSICAL REVIEW B, 1996, 53 (10) :6451-6454

[8] Quadrupolar phases of the S=1 bilinear-biquadratic Heisenberg model on the triangular lattice [J].

Laeuchli, Andreas ;

Mila, Frederic ;

Penc, Karlo .

PHYSICAL REVIEW LETTERS, 2006, 97 (08)

[9] MUON-SPIN-ROTATION AND RELAXATION STUDIES IN (TMTSF)(2)-X COMPOUNDS [J].

LE, LP ;

KEREN, A ;

LUKE, GM ;

STERNLIEB, BJ ;

WU, WD ;

UEMURA, YJ ;

BREWER, JH ;

RISEMAN, TM ;

UPASANI, RV ;

CHIANG, LY ;

KANG, W ;

CHAIKIN, PM ;

CSIBA, T ;

GRUNER, G .

PHYSICAL REVIEW B, 1993, 48 (10) :7284-7296

[10] Slow inhomogeneous spin dynamics in the frustrated antiferromagnet NiGa2S4 [J].

MacLaughlin, D. E. ;

Heffner, R. H. ;

Nakatsuji, S. ;

Nambu, Y. ;

Onuma, K. ;

Maeno, Y. ;

Ishida, K. ;

Bernal, O. O. ;

Shu, L. .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2007, 310 (02) :1300-1302

← 1 2 →