Low-temperature specific heat study of SrCu2(BO3)2 with an exactly solvable ground state |
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| Authors: | H Kageyama K Onizuka Y Ueda M Nohara H Suzuki H Takagi |
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| Institution: | (1) Institute for Solid State Physics, University of Tokyo, Tokyo 106-8666, Japan;(2) Graduate School of Frontier Science, University of Tokyo, Tokyo 113-8656, Japan |
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| Abstract: | The specific heat of a two-dimensional spin gap system SrCu2(BO3)2 realizing the Shastry-Suther-land 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. |
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