The publication “Evidence for a low-temperature magnetic ground state in double-perovskite iridates with Ir5+ (5d4) ions” of the University of Colorado-Boulder highlights many of Quantum Design’s latest sub-kelvin measuring functions. Among them are the helium-3 option for the MPMS and the ACDR option. To read the manuscript, go to the APS “Physical Review B” website https://doi.org/10.1103/PhysRevB.96.064436
Measurements of magnetic susceptibility and DC magnetization were carried out using a Quantum Design MPMS-7 magnetometer with superconducting quantum interference device. It is provided with helium-3 refrigeration capable of reaching low temperatures down to 0.44 K. A Quantum Design Dynacool physical property measurement system (PPMS) was equipped with a dilution refrigerator and a 14-Tesla magnet. AC magnetic susceptibility measurements over the temperature range from 0.05 K to 4 K were carried out using small AC drive fields (< 4 Oe rms). The PPMS was also used to perform heat capacity measurements in applied magnetic fields up to 14 T and temperatures down to 0.05 K. Access to low temperatures was essential to obtain adequate characterization of the magnetic ground state of the double-perovskite iridate samples.