Low-temperature specific heat study of SrCu2(BO3)2 with an exactly solvable ground state

H. Kageyama, K. Onizuka, Y. Ueda, M. Nohara, H. Suzuki, H. Takagi

Research output: Contribution to journalArticlepeer-review

18 Citations (Scopus)


The specific heat of a two-dimensional spin gap system SrCu2(BO3)2 realizing the Shastry-Sutherland model was measured between 1.3 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 to 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.

Original languageEnglish
Pages (from-to)129-132
Number of pages4
JournalJournal of Experimental and Theoretical Physics
Issue number1
Publication statusPublished - Jan 2000
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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