[Todos] Fwd: RECORDATORIO CHARLA IFLYSIB VIRTUAL - Viernes 18/12 10:30hs - "Observation of Hexatic vortex fluid in a superconducting thin film"

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-------- Mensaje original -------- 

 		ASUNTO:
 		RECORDATORIO CHARLA IFLYSIB VIRTUAL - Viernes 18/12 10:30hs -
"Observation of Hexatic vortex fluid in a superconducting thin film"

 		FECHA:
 		2020-12-17 14:06

 		REMITENTE:
 		Charlas IFLYSIB <charlas.iflysib en gmail.com>

 		DESTINATARIO:
 		Charlas Iflysib <charlas-iflysib en googlegroups.com>,
academic en fcaglp.unlp.edu.ar, fcnym en museo.fcnym.unlp.edu.ar,
info en ciop.unlp.edu.ar, internet en biol.unlp.edu.ar, scyt en frlp.utn.edu.ar,
Asistentes de Secretaria de Fisica <secre2 en fisica.unlp.edu.ar>,
secre en biol.unlp.edu.ar, secre en mate.unlp.edu.ar,
secretaria en inifta.unlp.edu.ar, secre en quimica.unlp.edu.ar

DADA LA SITUACIÓN ACTUAL EN RELACIÓN AL COVID-19, EL IFLYSIB HA RETOMADO
SUS SEMINARIOS EN FORMATO VIRTUAL. PARA ELLO, INVITAMOS A LA COMUNIDAD A
PARTICIPAR A TRAVÉS DEL LINK https://meet.google.com/ujy-jteo-ijq 

PARA ACCEDER AL ESPACIO VIRTUAL, LES PEDIMOS QUE SE IDENTIFIQUEN CON SU
NOMBRE A PARTIR DE 10:20HS. 

CHARLA IFLYSIB VIRTUAL 
VIERNES 18/12, 10:30HS. 
LINK:  https://meet.google.com/ujy-jteo-ijq 

TÍTULO: OBSERVATION OF HEXATIC VORTEX FLUID IN A SUPERCONDUCTING THIN
FILM 

EXPOSITOR: Pratap Raychaudhuri
Tata Institute of Fundamental Research, Mumbai, India
(https://www.tifr.res.in/~superconductivity/) 

RESUMEN:  

  In 1969, working on a theoretical problem of pure mathematical
curiosity, David Thouless stumbled upon a new kind of phase transition,
across which physical properties show abrupt change but the free energy
varies smoothly. Very soon, Michael Kosterlitz and David Thouless
realised that this kind of phase transition could be ubiquitous across
2-dimensional (2D) systems. For the particular case of a 2-dimensional
crystalline solid, the (Berezinski)-Kosterlitz-Thouless (BKT) theory
predicts the existence of a state intermediate between a solid and a
liquid, called the hexatic fluid, which possesses the orientational
order of a solid but the flow properties of a fluid.  Here I will
describe the realisation of hexatic vortex fluid in a very weakly pinned
amorphous MoGe thin film [1]. I will discuss the properties of this
hexatic vortex fluid and also discuss some very peculiar features of the
vortex states revealed from STS and transport measurements [2,3,4].

[1] _Melting of the Vortex Lattice through Intermediate Hexatic Fluid in
an a-MoGe Thin Film, I_ndranil Roy, Surajit Dutta, Aditya N. Roy
Choudhury, Somak Basistha, Ilaria Maccari, Soumyajit Mandal, John
Jesudasan, Vivas Bagwe, Claudio Castellani, Lara Benfatto, and Pratap
Raychaudhuri, Phys. Rev. Lett. 122, 047001 (2019).
[2] _Extreme sensitivity of the vortex state in a-MoGe films to
radio-frequency electromagnetic perturbation_, Surajit Dutta, Indranil
Roy, Soumyajit Mandal, John Jesudasan,  Vivas Bagwe, and Pratap
Raychaudhuri, Phys. Rev. B 100, 214518 (2019). 
[3] _An inertial model of vortices to explain the extreme sensitivity of
hexatic vortex fluid to low frequency ac excitation_, Surajit Dutta and
Pratap Raychaudhuri, Physica C 578, 1353740 (2020).
[4]_ Collective flux pinning in hexatic vortex fluid in a-MoGe thin
film_, Surajit Dutta, Indranil Roy, Somak Basistha, Soumyajit Mandal,
John Jesudasan, Vivas Bagwe and Pratap Raychaudhuri, J. Phys.: Condens.
Matter 32, 075601 (2020). -- 

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