Science Advances

Supplementary Materials

This PDF file includes:

  • Powder x-ray diffraction
  • Magnetization measurements
  • Single crystal x-ray diffraction
  • Pyroelectric coefficient measurements
  • fig. S1. Powder x-ray diffraction pattern of Cu2OCl2.
  • fig. S2. Magnetic susceptibility of our polycrystalline Cu2OCl2 samples.
  • fig. S3. First temperature derivative of the magnetic susceptibility of Cu2OCl2 single crystals indicating TN.
  • fig. S4. Specific heat of a Cu2OCl2 single crystal indicating a value of TN that is consistent with our magnetization.

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Other Supplementary Material for this manuscript includes the following:

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