The specific heat of a two-dimensional spin gap system SrCu2(BO3)2 realizing the Shastry-Sutherland model was measured between 1.3 K and 25 K under various magnetic fields up to 12 T. The analysis based on an isolated dimer model in a low temperature region revealed that the value of the spin gap at zero field is Δ = 34.4 K. It turned out that Δ decreases in proportion with H due to the Zeeman splitting of the excited triplet levels. This simplest model, however, fails to reproduce the result in a high temperature region, suggesting rather strong spin-spin correlation of the system.
|Number of pages||4|
|Journal||Zhurnal Eksperimental'noj i Teoreticheskoj Fiziki|
|Publication status||Published - 2000|
ASJC Scopus subject areas
- Physics and Astronomy(all)