2,638 research outputs found
Hidden quasi one-dimensional superconductivity in SrRuO
Using an asymptotically exact weak coupling analysis of a multi-orbital
Hubbard model of the electronic structure of \SRO, we show that the interplay
between spin and charge fluctuations leads unequivocally to triplet pairing
which originates in the quasi-one dimensional bands. The resulting
superconducting state spontaneously breaks time-reversal symmetry and is of the
form with sharp gap minima and a d-vector
that is only {\it weakly} pinned. The supercondutor is topologically {\it
trivial} and hence lacks robust chiral Majorana fermion modes along the
boundary. The absence of topologically protected edge modes could explain the
surprising absence of experimentally detectable edge currents in this system.Comment: 5 pages, 3 figure
Microrheological Studies of Regenerated Silk Fibroin Solution by Video Microscopy
We have carried out studies on the rheological properties of regenerated silk
fibroin (RSF) solution using video microscopy. The degummed silk from the
Bombyx mori silkworm was used to prepare RSF solution by dissolving it in
calcium nitrate tetrahydrate-methanol solvent. Measurements were carried out by
tracking the position of an embedded micron-sized polystyrene bead within the
RSF solution through video imaging. The time dependent mean squared
displacement (MSD) of the bead in solution and hence, the complex shear modulus
of this solution was calculated from the bead's position information. An
optical tweezer was used to transport and locate the bead at any desired site
within the micro-volume of the sample, to facilitate the subsequent free-bead
video analysis. We present here the results of rheological measurements of the
silk polymer network in solution over a frequency range, whose upper limit is
the frame capture rate of our camera, at full resolution. By examining the
distribution of MSD of beads at different locations within the sample volume,
we demonstrate that this probe technique enables us to detect local
inhomogeneties at micrometer length scales, not detectable either by a
rheometer or from diffusing wave spectroscopy.Comment: 5 page
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