Speaker
Dr
Alexander Holmes
(University of Birmingham)
Description
BiPd is a non-centrosymmetric superconductor with a monoclinic crystal structure, a Tc of 3.8 K, and an upper critical field Bc2 (T = 0) ~ 0.7 T. The initial motivation for investigating this compound was to search for signs of mixed singlet-triplet pairing, as is permitted in systems lacking inversion symmetry. However, recent measurements by TF muSR and SANS have shown that the most striking feature of BiPd seems to be extreme multi-band superconductivity. MuSR provides evidence of at least two components with very different critical fields and penetration depths. Flux lattice measurements by SANS confirm the existence of a phase with a critical field around 10 times lower than that identified by resistivity and magnetisation. We also find evidence of an intermediate mixed state, where Meissner and flux lattice phases coexist.
In addition, I will present an improved method of SANS data treatment for flux lattice diffraction patterns, using Bayes’ theorem.
Primary author
Dr
Alexander Holmes
(University of Birmingham)
Co-authors
Dr
Adrian Hillier
(ISIS)
Alex Amato
(Paul Scherrer Institut)
Dr
Arumugum Thamizavel
(TIFR)
Mr
Bhanu Joshi
(Tata Institute of Fundamental Research)
Mr
Daniel Mazzone
(PSI)
Edward Forgan
(University of Birmingham)
Dr
Edward Yelland
(University of St Andrews)
Jorge Gavilano
(Paul Scherrer Institut)
Mr
Louis Lemberger
(Institut Laue Langevin)
Prof.
Srinivasan Ramakrishnan
(TIFR)
