0:00:02bright iambs at the use of energy a professor in the department of physics of
0:00:06the indian institute of technology con for these are my collaborators mister work we show
0:00:10admissible with someone that might be these students and prosody achieved among right from the
0:00:15university of tokyo
0:00:16the relatively low density ordered vortex so that a sensible conduct that smells into a
0:00:20higher density disordered vortex liquid phase under the influence of an ensemble fluctuations
0:00:26shown below is a schematic representation of the behavior of the sheer elastic more like
0:00:30of the vortex like that of the function of increasing magnetic
0:00:34what x melting is the expected whenever the vortex lattices are namely when the elastic
0:00:39more like is low at low and high magnetic at low magnetic field theoretically a
0:00:44transformation from the vortex liquid two solid phase is expected you to the and hunting
0:00:49stiffness of the lattice due to increasing in the vortex interactions with increasing magnetic field
0:00:54in the present study we have investigated the nature of the low we walked experience
0:00:59i feel mending is an already well studied phenomena
0:01:02using the high sensitivity magnet optical imaging setup a lot the tidy contour we measure
0:01:08the local magnetic field distribution inside this upon the though
0:01:12shown here is a schematic of the local field distribution of process above conducted you
0:01:16but the presence of what this is the
0:01:18the local magnetic field is proportional to the density of porpoises in this apartment
0:01:24we measure the local magnetic field distribution inside the material by measuring the intensity of
0:01:31the parity rotated linearly polarised light
0:01:34you know what experiment we have attempted to measure the changes in the vortex tensity
0:01:39you to face transformations in the vortex state at low magnetic
0:01:44these are differential magnet optical images captured at fifty calibre in which represent the changes
0:01:49in the local magnetic field produced in response to the next on a field modulation
0:01:54of one gauss which is applied at each of the measuring applied magnetic
0:02:00nor the bright white regions in these images corresponds to what actually with bottles where
0:02:05there is a comparatively larger change in the local magnetic field or vortex tensity
0:02:10our initial investigations show an initial low field vortex liquid phase which sustains larger changes
0:02:17in the vortex tensity settling down into a vortex solid phase at heart magnetic field
0:02:24with sustained smaller changes in the vortex tensity furthermore
0:02:28new creation of the vortex solid phase is characterized by the disappearance of shielding cartons
0:02:33within the vortex solid regions ad is noted with then circled region and also with
0:02:39the saddle
0:02:41based on such studies we have identified the vortex liquid the solid melting line experimentally
0:02:48this experimentally determined based on the shen boundary is also matching well with the theoretically
0:02:54predicted melting line at low magnetic field in be infeasible conductors
0:03:00around this mending phrase boundary we have also identified a le de marco existence but
0:03:05the vortex solid and liquid phases coexist
0:03:08using our magnet optical imaging technique we spatially it is all the information on relaxation
0:03:14of them in a magnet isolation at different locations in the sample which we used
0:03:19to reduce the pinning landscape across the sample
0:03:22the variation in pinning across different regions of the sample are represented by the coloured
0:03:27bar the present beside the coloured image of the sample
0:03:31we find that the location of the low in vortex liquid the solid based on
0:03:35that and boundary shifts but radiation in training
0:03:40which is well described by the effectively in the men but increasing with the pinning
0:03:45strand thank you