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Small angle neutron scattering study oft he mixed state of Yb3Rh4Sn13

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Mazzone Daniel et al.,
Project Superconductivity in Unconventional Metals and its Interplay with Magnetism
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Original article (peer-reviewed)

Journal Phys. Rev. B
Volume (Issue) 90(2)
Page(s) 02507
Title of proceedings Phys. Rev. B
DOI 10.1103/physrevb.90.020507


Using the small angle neutron scattering (SANS) technique we investigated the vortex lattice (VL) in the mixed state of the stannide superconductor Yb3Rh4Sn13. We find a single domain VL of slightly distorted hexagonal geometry for field strengths between 350 and 18 500 G and temperatures between T = 0.05 and 6.5 K. We observe a clear in-plane rotation of the VL for different magnetic field directions relative to the crystallographic axes. We also find that the hexagonal symmetry of the VL is energetically favorable in Yb3Rh4Sn13 for external fields oriented along axes of different symmetries: twofold [110], threefold [111], and fourfold [100]. The observed behavior is different from other conventional and unconventional superconductors. The superconducting state is characterized by an isotropically gapped order parameter with an amplitude of Delta(0) = 1.57 +/- 0.05 meV. At the lowest temperatures, the field dependence of the magnetic form factor in our material reveals a London penetration depth of lambda(L) = 2508 +/- 17 angstrom and a Ginzburg coherence length of xi = 100 +/- 1.3 angstrom, i.e., it is a strongly type-II superconductor, kappa = lambda(L)/xi = 25.