Bulletin of the American Physical Society
APS March Meeting 2011
Volume 56, Number 1
Monday–Friday, March 21–25, 2011; Dallas, Texas
Abstract: K1.00236 : Evidence for intrinsic vortex pinning in 1111 Fe arsenides single-crystals
Author:
We performed a study of the angular dependence of the magnetic
torque $\tau(\theta)$ in LaFeAsO$_{0.9}$F$_{0.1}$ and in
SmFeAsO$_{0.9}$F$_{0.1}$ single crystals. Here, $\theta$ is the
angle between the magnetic field and inter-plane c-axis. As the
temperature is lowered, one observes the emergence of sharp
features in the magnetic torque for fields nearly aligned along
the conducting planes. In particular, one observes two sharp
peaks at a critical angle $\theta_c$ placed respectively slightly
above and below $\theta = 90^{\circ}$, in the reversible
component of the torque. Their position in angle, relative to
$\theta =90^{\circ}$ , decreases as the field increases, and
increases as the temperature is lowered. We conclude that
$\theta_c$ corresponds to a critical pinning angle whose behavior
is consistent with theoretical predictions for the intrinsic
pinning of vortices by a layered crystallographic structure.
However, in sharp contrast with the cuprates, in the region of
temperatures where this behavior is observed the superconducting
anisotropy of 1111 Fe arsenides is rather small, as measured by
torque magnetometry.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.K1.236
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