Uniaxial stress-strain relationship of electronic materials in the non-linear regime (A10)

• Subject Area: Experimental Condensed Matter Physics
• Term: since 2020
• Project identifier: Deutsche Forschungsgemeinschaft (DFG) - Project number 422213477

To gain thermodynamic information on electronic phases under uniaxial stress, we will develop apparatus and methods for measurement of stress-strain curves of correlated electron materials. The technical goal is to trace arbitrary paths in stress-temperature space and measure the resulting strain. Materials with first-order electronic and structural transitions (CrAs, CaFe2As2, and EuRh2Si2) will be studied, to determine the effect of uniaxial stress on these transitions, and to probe whether critical endpoints can be reached. Fluctuations around these critical endpoints will be heavily influenced by electron-lattice coupling. The coupling between charge order and lattice deformation in BaNi2As2 will also be investigated.

• DFG Programme: CRC/Transregios
• Subproject of: TRR 288: Elastic Tuning and Response of Electronic Quantum Phases of Matter (ELASTO-Q-MAT)
• Applicant Institution: Goethe-Universität Frankfurt am Main
• Project Heads: Dr. Clifford Hicks, Ph.D.; Professor Dr. Andrew Mackenzie