2012/08/31 by A. Jesche, Anton Jesche, Fabian Nitsche +9
Business, Management and Accounting · Materials Science · Physics and Astronomy · #Corporate Taxation and Avoidance #Iron-based superconductors research #Rare-earth and actinide compounds #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.86.134511
published as Phys. Rev. B 86, 134511 (2012) · 10 pages, 6 figures, minor changes
openalex publication_date 2012/10/08 · arxiv created 2012/10/17 · arxiv updated 2012/10/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Single crystals of LaFeAsO were successfully grown out of KI flux. Temperature-dependent electrical resistivity was measured with current flow along the basal plane, \ensuremathρ_\ensuremath⊥(T), as well as with current flow along the crystallographic c axis, \ensuremathρ_\ensuremath∥(T), the latter utilizing electron-beam lithography and argon-ion-beam milling. The anisotropy ratio was found to lie between \ensuremathρ_\ensuremath∥/\ensuremathρ_\ensuremath⊥=20--200. The measurement of \ensuremathρ_\ensuremath⊥(T) was performed with current flow along the tetragonal [1 0 0] direction and along the [1 1 0] direction and revealed a clear in-plane anisotropy already at T\ensuremath≤175 K. This is significantly above the orthorhombic distortion at T0=147 K and indicates the formation of an electron nematic phase. Magnetic susceptibility and electrical resistivity give evidence for a change of the magnetic structure of the iron atoms from antiferromagnetic to ferromagnetic arrangement along the c axis at T*=11 K.