, University of California, Davis
[Host: Bellave Shivaram]
We describe a helium-activated bellows cell for measurements under uniaxial pressure. The apparatus can be useful for various reasons: monitoring asymmetric behavior with pressure applied along different axes; breaking the symmetry of a tetragonal crystal; changing pressure at low temperature to cross pressure-induced phase transitions directly; and making smaller pressure adjustments than possible with typical hydrostatic pressure arrangements. Several families of unconventional superconductors, including high-Tc materials, the 115 family, and iron pnictides and chalcogenides, have a layered structure and notably anisotropic behavior, making them good candidates for uniaxial pressure measurements. We present data on 115 and pnictide materials highlighting the influence of geometry on their phase diagrams.
Condensed Matter Seminar
Thursday, January 15, 2015
Physics Building, Room 204
Note special room.
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