Random singlet state in Ba5CuIr3O12 single crystals

  title={Random singlet state in 
 single crystals},
  author={Pavel A. Volkov and C. J. Won and Denis Ivanovich Gorbunov and Jaewook Kim and Mai Ye and Heung-Sik Kim and Jedediah H. Pixley and Sang‐Wook Cheong and Girsh Blumberg},
  journal={Physical Review B},
We study the thermodynamic and high-magnetic-field properties of the magnetic insulator ${\mathrm{Ba}}_{5}{\mathrm{CuIr}}_{3}{\mathrm{O}}_{12}$, which shows no magnetic order down to 2 K, consistent with a spin-liquid ground state. While the temperature dependence of the magnetic susceptibility and the specific heat shows only weak antiferromagnetic correlations, we find that the magnetization does not saturate up to a field of 59 T, leading to an apparent contradiction. We demonstrate that the… 
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