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Published September 2015 | Published
Journal Article Open

Sub-Kelvin magnetic and electrical measurements in a diamond anvil cell with in situ tunability


We discuss techniques for performing continuous measurements across a wide range of pressure–field–temperature phase space, combining the milli-Kelvin temperatures of a helium dilution refrigerator with the giga-Pascal pressures of a diamond anvil cell and the Tesla magnetic fields of a superconducting magnet. With a view towards minimizing remnant magnetic fields and background magnetic susceptibility, we characterize high-strength superalloy materials for the pressure cell assembly, which allows high fidelity measurements of low-field phenomena such as superconductivity below 100 mK at pressures above 10 GPa. In situ tunability and measurement of the pressure permit experiments over a wide range of pressure, while at the same time making possible precise steps across abrupt phase transitions such as those from insulator to metal.

Additional Information

© 2015 AIP Publishing LLC. Received 29 June 2015; accepted 19 August 2015; published online 4 September 2015. We thank V. Struzhkin for providing the 40HNU-VI alloy sample for testing, J. M. Honig for growing the NiS2 samples, S. Sinogeikin at HP-CAT (Sector 16) of the Advanced Photon Source for development of helium diaphragm membranes, and J. S. Schilling for useful conversations. The work at the University of Chicago was supported by the National Science Foundation (Grant No. DMR-1206519) and used MRSEC shared facilities (NSF Grant No. DMR-1420709). D.M.S. acknowledges support from the U.S. Department of Energy Office of Basic Energy Sciences (Grant No. DE-FG02-99ER45789). The work at the Advanced Photon Source of Argonne National Laboratory was supported by the U.S. Department of Energy Basic Energy Sciences under Contract No. DE-AC02-06CH11357.SQUID magnetometry measurements were performed in part at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, under Contract No. DE-AC02-06CH11357 with the assistance of B. Fisher.

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