Directional ordering of fluctuations in a two-dimensional compass model

Anup Mishra*, Michael Ma, Fu Chun Zhang, Siegfried Guertler, Lei Han Tang, Shaolong Wan

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

62 Citations (Scopus)


A classical realization of directional coupling in two dimension of the effective orbital-orbital interaction in the Mott insulating phase of the transition metal oxides (TMO) was presented. The model exhibited partial orbital ordering in the form of directional ordering of fluctuation at low temperatures stabilized by an entropy gap. The directional ordering was necessarily accompanied by a lattice distortion and the bond length in horizontal and vertical directions became unequal when the couplings of the orbital isosopin to lattice modes were included. Analysis shows that the compass model has a low temperature phase which exhibited long-ranged correlations in the directions of fluctuations in both isospin and lattice spaces.

Original languageEnglish
Article number207201
Pages (from-to)207201-1-207201-4
Number of pages4
JournalPhysical Review Letters
Issue number20
Publication statusPublished - 12 Nov 2004

Scopus Subject Areas

  • Physics and Astronomy(all)


Dive into the research topics of 'Directional ordering of fluctuations in a two-dimensional compass model'. Together they form a unique fingerprint.

Cite this