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<div class="pre" style="margin: 0; padding: 0; font-family: monospace">********************************************<br /> Secretaría Dpto. de Física<br /> <a href="mailto:secre2@fisica.unlp.edu.ar">secre2@fisica.unlp.edu.ar</a><br /> Cecilia Cafiero / Alejandro Chiquino<br /> 115 e/48 y 49 - Detrás del Colegio Nacional<br /> Facultad de Ciencias Exactas - UNLP<br /> ********************************************</div>
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<th align="right" valign="baseline" nowrap="nowrap">Asunto:</th>
<td>CHARLA IFLYSIB VIRTUAL - Viernes 18/12 10:30hs - "Observation of Hexatic vortex fluid in a superconducting thin film"</td>
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<th align="right" valign="baseline" nowrap="nowrap">Fecha:</th>
<td>2020-12-14 11:38</td>
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<th align="right" valign="baseline" nowrap="nowrap">Remitente:</th>
<td>Charlas IFLYSIB <charlas.iflysib@gmail.com></td>
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<th align="right" valign="baseline" nowrap="nowrap">Destinatario:</th>
<td>Charlas Iflysib <charlas-iflysib@googlegroups.com>, academic@fcaglp.unlp.edu.ar, fcnym@museo.fcnym.unlp.edu.ar, info@ciop.unlp.edu.ar, internet@biol.unlp.edu.ar, scyt@frlp.utn.edu.ar, Asistentes de Secretaria de Fisica <secre2@fisica.unlp.edu.ar>, secre@biol.unlp.edu.ar, secre@mate.unlp.edu.ar, secretaria@inifta.unlp.edu.ar, secre@quimica.unlp.edu.ar</td>
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<div dir="ltr" style="text-align: justify;"><strong><span style="color: #674ea7;"><br /><span style="font-size: 12pt;">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 </span></span></strong><span style="font-size: 12pt;"><a href="https://meet.google.com/ujy-jteo-ijq">https://meet.google.com/ujy-jteo-ijq</a></span></div>
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<div dir="ltr"><span style="font-size: 12pt;"><strong><span style="color: #674ea7;">Para acceder al espacio virtual, les pedimos que se identifiquen con su nombre a partir de 10:20hs.</span></strong></span></div>
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<div dir="ltr" style="text-align: center;"><span style="font-size: 12pt;"><strong style="color: #6aa84f;"><span>Charla IFLYSIB VIRTUAL</span></strong></span></div>
<div dir="ltr" style="text-align: center;"><span style="font-size: 12pt;"><strong style="color: #6aa84f;"><span>Viernes 18/12, 10:30hs.</span></strong></span></div>
<div dir="ltr" style="text-align: center;"><span style="font-size: 12pt;"><strong style="color: #6aa84f;"><span>Link: </span></strong><a href="https://meet.google.com/ujy-jteo-ijq">https://meet.google.com/ujy-jteo-ijq</a></span></div>
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<div><span style="font-size: 12pt;"><strong> </strong></span></div>
<div><span style="font-size: 12pt;"><strong>Título:<span style="color: #000000;"> </span>Observation of Hexatic vortex fluid in a superconducting thin film</strong></span></div>
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<div><span style="font-size: 12pt;"><strong>Expositor:</strong> Pratap Raychaudhuri</span><br /><span style="font-size: 12pt;">Tata Institute of Fundamental Research, Mumbai, India (<a href="https://www.tifr.res.in/~superconductivity/">https://www.tifr.res.in/~superconductivity/</a>)</span></div>
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<div><span style="font-size: 12pt;"><strong><span style="color: #000000;">Resumen:</span></strong> </span></div>
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<span style="font-size: 12pt;">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].</span><br /><br /><span style="font-size: 12pt;">[1] <em>Melting of the Vortex Lattice through Intermediate Hexatic Fluid in an a-MoGe Thin Film, I</em>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. <strong>122</strong>, 047001 (2019).</span><br /><span style="font-size: 12pt;">[2] <em>Extreme sensitivity of the vortex state in a-MoGe films to radio-frequency electromagnetic perturbation</em>, Surajit Dutta, Indranil Roy, Soumyajit Mandal, John Jesudasan, Vivas Bagwe, and Pratap Raychaudhuri, Phys. Rev. B <strong>100</strong>, 214518 (2019).</span></div>
<div dir="ltr"><span style="font-size: 12pt;">[3] <em>An inertial model of vortices to explain the extreme sensitivity of hexatic vortex fluid to low frequency ac excitation</em>, Surajit Dutta and Pratap Raychaudhuri, Physica C <strong>578</strong>, 1353740 (2020).</span><br /><span style="font-size: 12pt;">[4]<em> Collective flux pinning in hexatic vortex fluid in a-MoGe thin film</em>, Surajit Dutta, Indranil Roy, Somak Basistha, Soumyajit Mandal, John Jesudasan, Vivas Bagwe and Pratap Raychaudhuri, J. Phys.: Condens. Matter 32, 075601 (2020).</span>
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<span style="font-size: 12pt;">-- </span><br />
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<div style="text-align: justify;"><span style="font-size: 12pt;"><span style="font-family: arial;"><strong>Comisión ChIFLy</strong></span></span></div>
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