Emergent defect states as a source of resistivity anisotropy in the nematic phase of iron pnictides

Maria N. Gastiasoro, I. Paul, Y. Wang, P. J. Hirschfeld, Brian M. Andersen

Research output: Contribution to journalArticlepeer-review

28 Scopus citations

Abstract

We consider the role of potential scatterers in the nematic phase of Fe-based superconductors above the transition temperature to the (π, 0) magnetic state but below the orthorhombic structural transition. The anisotropic spin fluctuations in this region can be frozen by disorder, to create elongated magnetic droplets whose anisotropy grows as the magnetic transition is approached. Such states act as strong anisotropic defect potentials that scatter with much higher probability perpendicular to their length than parallel, although the actual crystal symmetry breaking is tiny. We calculate the scattering potentials, relaxation rates, and conductivity in this region and show that such emergent defect states are essential for the transport anisotropy observed in experiments.

Original languageEnglish (US)
Article number127001
JournalPhysical review letters
Volume113
Issue number12
DOIs
StatePublished - Sep 15 2014

Fingerprint

Dive into the research topics of 'Emergent defect states as a source of resistivity anisotropy in the nematic phase of iron pnictides'. Together they form a unique fingerprint.

Cite this