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27 April 2024

» arxiv » 1303.2767

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Vortex lock-in transition and evidence for transitions among commensurate kinked vortex configurations in single-layered Fe arsenides
G. Li ; G. Grissonnanche ; B. S. Conner ; F. Wolff-Fabris ; C. Putzke ; N. D. Zhigadlo ; S. Katrych ; Z. Bukowski ; J. Karpinski ; L. Balicas ;
Date:	12 Mar 2013
Abstract:	We report an angle-dependent study of the magnetic torque $ au( heta)$ within the vortex state of single-crystalline LaO$_{0.9}$F$_{0.1}$FeAs and SmO$_{0.9}$F$_{0.1}$FeAs as a function of both temperature $T$ and magnetic field $H$. Sharp peaks are observed at a critical angle $ heta_c$ at either side of $ heta=90^{circ}$, where $ heta$ is the angle between $H$ and the inter-planar emph{c}-axis. $ heta_c$ 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 $ heta$ and as $ heta$ is swept away from the planar direction. These suggest commensurability effects between the period of the vortex lattice and the inter-planar distance leading to additional kinked vortex configurations.
Source:	arXiv, 1303.2767
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