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

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Abstract

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.

Original languageEnglish
Pages (from-to)145-148
Number of pages4
JournalZhurnal Eksperimental'noj i Teoreticheskoj Fiziki
Volume117
Issue number1
Publication statusPublished - Dec 1 2000

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ASJC Scopus subject areas

  • Physics and Astronomy(all)

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