2013/03/11 by G. Li, Gang Li, G. Grissonnanche +12
Materials Science · Mathematics · Physics and Astronomy · #Condensed matter physics #Geometry #Iron-based superconductors research #Lattice (music) #Magnetic and transport properties of perovskites and related materials #Magnetic field #Mathematics #Perpendicular #Physics #Physics of Superconductivity and Magnetism #Planar #Quantum mechanics #Superconductivity #Vortex #Vortex state #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.87.100503
published as Physical Review B 87, 100503(R) (2013) · 5 pages, 5 figures
openalex publication_date 2013/03/11 · arxiv created 2013/03/12 · arxiv updated 2013/03/13 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We report an angle-dependent study of the magnetic torque \ensuremathτ(\ensuremathθ) within the vortex state of single-crystalline LaO0.9F0.1FeAs and SmO0.9F0.1FeAs as a function of both temperature T and magnetic field H. Sharp peaks are observed at a critical angle \ensuremathθc at either side of \ensuremathθ=90^\ensuremath∘, where \ensuremathθ is the angle between H and the interplanar c axis. \ensuremathθc is interpreted as the critical depinning angle where the vortex lattice, pinned and locked by the intrinsic planar structure, unlocks and acquires a component perpendicular to the planes. We observe a series of smaller replica peaks as a function of \ensuremathθ and as \ensuremathθ is swept away from the planar direction. These suggest commensurability effects between the period of the vortex lattice and the interplanar distance leading to additional kinked vortex configurations.