Abstract
We report the separate response of the critical temperature of the nematic phase transition to symmetric and antisymmetric strains for the prototypical underdoped iron pnictide . This decomposition is achieved by comparing the response of to in-plane uniaxial stress and hydrostatic pressure. In addition to quantifying the two distinct linear responses to symmetric strains, we find a quadratic variation of as a response to antisymmetric strains , exceeding the nonlinear response to symmetric strains by at least two orders of magnitude. These observations establish orthogonal antisymmetric strain as a powerful tuning parameter for nematic order.
2 More- Received 10 May 2018
- Revised 19 November 2018
DOI:https://doi.org/10.1103/PhysRevB.98.245133
©2018 American Physical Society