Quick Search: Journal  Author  Title/Abstract  Vol./Year 

J. Phys. Soc. Jpn. 75 (2006) 083701 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
|Full Text PDF (325K)| |Buy This Article|

Letters

Spin Nematic Phase in S=1 Triangular Antiferromagnets

Hirokazu Tsunetsugu and Mitsuhiro Arikawa

Yukawa Institute for Theoretical Physics, Kyoto University, Kyoto 606-8502

(Received May 1, 2006; Accepted June 5, 2006; Published July 25, 2006)

Spin nematic order is investigated for an S=1 spin model on a triangular lattice with bilinear–biquadratic interactions. We particularly studied an antiferro nematic order phase with a three-sublattice structure, and magnetic properties are calculated at zero temperature by bosonization. Two types of bosonic excitations are found and we calculated dynamic and static spin correlations. One is a gapless excitation with linear energy dispersion around k ∼0, and this leads to a finite spin susceptibility at T=0 and would have a specific heat C(T) ∼T2 at low temperatures. These behaviors can explain many of the characteristic features of a recently discovered spin liquid state in the triangular magnet, NiGa2S4. ©2006 The Physical Society of Japan

KEYWORDS: antiferromagnets, triangular lattice, spin nematics, quadrupolar ordering
URL: http://jpsj.ipap.jp/link?JPSJ/75/083701/
DOI: 10.1143/JPSJ.75.083701


|Full Text PDF (325K)| |Buy This Article| Citation:

References | Citing Articles (26)

  1. P. W. Anderson: Mater. Res. Bull. 8 (1973) 153.
  2. P. Fazekas and P. W. Anderson: Philos. Mag. 30 (1974) 423.
  3. K. Ishida, M. Morishita, K. Yawata and H. Fukuyama: Phys. Rev. Lett. 79 (1997) 3451[APS].
  4. Y. Shimizu, K. Miyagawa, K. Kanoda, M. Maesato and G. Saito: Phys. Rev. Lett. 91 (2003) 107001[APS].
  5. S. Nakatsuji, Y. Nambu, H. Tonomura, O. Sakai, S. Jonas, C. Broholm, H. Tsunetsugu, Y. Qiu and Y. Maeno: Science 309 (2005) 1697[Science].
  6. H. H. Chen and P. M. Levy: Phys. Rev. Lett. 27 (1971) 1383[APS].
  7. A. F. Andreev and I. A. Grishchuk: Sov. Phys. JETP 60 (1984) 267.
  8. P. Chandra and P. Coleman: Phys. Rev. Lett. 66 (1991) 100[APS].
  9. V. M. Matveev: Sov. Phys. JETP 38 (1974) 813.
  10. One can also define similar nematic order parameters for spin-1/2 systems, if we compose effective spin S ≥1 using multiple spins with S=1/2.
  11. For example, an exact diagonalization study supports the presence of the magnetic long-range order for the S=1/2 case [B. Bernu, P. Lecheminant, C. Lhuillier and L. Pierre: Phys. Rev. B 50 (1994) 10048[APS]], and the order is more stable for a larger spin S=1.
  12. G. Fáth and J. Sólyom: Phys. Rev. B 51 (1995) 3620[APS].
  13. U. Schollwöck, Th. Jolicoeur and T. Garel: Phys. Rev. B 53 (1996) 3304[APS].
  14. K. Harada and N. Kawashima: Phys. Rev. B 65 (2002) 052403[APS].
  15. A. Läuchli, G. Schmid and S. Trebst: cond-mat/0311082[e-print arXiv].
  16. The dimerized phase is discussed when J=0 and K<0 in M. N. Barber and M. T. Batchelor: Phys. Rev. B 40 (1989) 4621[APS]; See also I. Affleck, T. Kennedy, E. H. Lieb and H. Tasaki: Commun. Math. Phys. 115 (1988) 477[CrossRef].
  17. T. Momoi: private communication.
  18. H. Kawamura and S. Miyashita: J. Phys. Soc. Jpn. 53 (1984) 4138[IPAP].
  19. N. D. Mermin and H. Wagner: Phys. Rev. Lett. 17 (1966) 1133[APS].
  20. A. Läuchli, F. Mila and K. Penc: cond-mat/0605234[e-print arXiv].
|TOP|  |Previous Article| |Next Article|  |Table of Contents| |JPSJ Home|
Copyright © 2009 The Physical Society of Japan
Contact Information