Talks in APS&JPS March 2019
I presented our study "Study of chiral d-wave superconductor candidate URu$_2$Si$_2$ by using scanning SQUID microscopy" in APS(American Physics Society) March Meeting 2019 at Boston, USA and in JPS(Physics Society of Japan) 74th Annual Meeting at Kyushu University, Japan.
We observed inhomogeneous magnetic flux and superconducting diamagnetism and local ferromagnetic transition at 16.1-16.2 K at surface of the chiral d-wave symmetry superconductor candidate URu$_2$Si$_2$ single crystal. We also observed the isotropic and anisotropic vortex motions(See next paragraph) in different positions at same temperature. It suggests that Vortex pinning potential is locally anisotropic($C_2$) and isotropic($C_4$). These results will be published soon.
Irene Pu Zhang, who is a PhD student in Moler Gr, also presented our study "Anisotropic Vortex Pinning in Single Crystal FeSe" in APS March 2019. We observed anisotropic vortex motion in the magnetic AC susceptibility scan in nematic superconductor FeSe. The anisotropic directions of this anisotropic motion ,which we call 'butterfly', are along the direction of nematic order(Orthorhombic crystal axis). Our simulation with use of a quadratic pinning potential shows the same butterfly image with anisotropic spring constant and an isotropic image, which we call 'donuts', with isotropic spring constant. We only observed the butterfly in FeSe, but the donuts was observed in URu$_2$Si$_2$. This result will be published soon.
Title: Study of chiral d-wave superconductor candidate URu$_2$Si$_2$ by using scanning SQUID microscopy
Authors: Y. Iguchi, I.P. Zhang,
E.D. Bauer, F. Ronning, J.R. Kirtley, and K.A. Moler
-APS March Meeting 2019 @Boston, X08.00010
-JPS 79th Annual Meeting @Kyushu University, 14aS302-8
Title: Anisotropic Vortex Pinning in Single Crystal FeSe
Authors: I. Zhang, L. B.-V. Horn, J. Palmstrom, J. R. Kirtley, Y. Iguchi, I. R. Fisher, K. A. Moler
-APS March Meeting 2019 @Boston, E10.00010