1302.4144 (W. J. Gannon et al.)

Temperature Dependence of the Magnetic Penetration Depth and Nodal Gap
Structure of UPt$_3$ from Small Angle Neutron Scattering    [PDF]

W. J. Gannon, W. P. Halperin, C. Rastovski, K. J. Schlesinger, J. Hlevyack, C. Steiner, M. R. Eskildsen, J. Gavilano, U. Gasser, G. Nagy

We report measurements of the temperature dependence of the different components of the London magnetic penetration depth using small angle neutron scattering from the vortex lattice in a high quality crystal of \UP. Deconvolution of the contributions to the neutron scattering form factor from currents along the $a^*$ and $c$-axes gives direct information about the nodal structure of the order parameter. Our observations of linear temperature dependence at low temperatures of all components of the penetration depth support the assignment of E$_{2u}$ symmetry to the superconducting state of \UP.

View original: http://arxiv.org/abs/1302.4144