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High-field behavior of the spin gap compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Sr</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi mathvariant="normal">B</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
We report magnetization and heat capacity measurements of single crystal samples of the spin gap compound ${\mathrm{Sr}}_{2}\mathrm{Cu}{(\mathrm{B}{\mathrm{O}}_{3})}_{2}$. Low-field data show that the material has a singlet ground state comprising dimers with intradimer coupling $J=100\phantom{\rule{0.3em}{0ex}}\mathrm{K}$. High field data reveal the role of weak interdimer coupling. For fields that are large compared …