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

doi:10.1134/1.559083

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 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 language	English
Pages (from-to)	129-132
Number of pages	4
Journal	Journal of Experimental and Theoretical Physics
Volume	90
Issue number	1
DOIs	https://doi.org/10.1134/1.559083
Publication status	Published - Jan 2000
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

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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 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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AU - Nohara, M.

AU - Suzuki, H.

AU - Takagi, H.

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AB - 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.

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

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