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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Vabimo vas na 10. predavanje iz sklopa "Kolokviji na IJS" v letu 2011/12, ki bo <strong><span style='color:red'>v sredo, 25. januarja, 2012, ob 13. uri </span></strong><span style='color:red'>v Veliki predavalnici Instituta »Jožef Stefan«</span> na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete tudi na naslovu <a href="http://www.ijs.si/ijsw/Koledar_prireditev">http://www.ijs.si/ijsw/Koledar_prireditev</a>, posnetke preteklih predavanj<span style='color:blue'> </span>pa na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>. <o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<o:p></o:p></p><p class=MsoNormal><b>prof. dr. Viktor Kabanov<o:p></o:p></b></p><p class=MsoNormal><i>Institut Jožef Stefan, Odsek za kompleksne snovi<o:p></o:p></i></p><p class=MsoNormal><i><o:p> </o:p></i></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'><b><span style='font-size:14.0pt'>Superprevodnost: Sklopitev med elektroni in fononi ter nekonvencionalno parjenje z odbojno interakcijo<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Iskanje boljših superprevodnikov z višjo temperaturo prehoda, ki prenesejo močnejša magnetna polja in večje kritične tokove, je eden glavnih izzivov fizike kondenzirane snovi. V Bardeen-Cooper-Schriefferjevi teoriji superprevodnosti pride do tvorbe Cooperjevih parov zaradi interakcije, ki jo posredujejo nihanja kristalne mreže (torej fononi). V predavanju bomo obravnavali različne eksperimentalne metode, ki omogočajo ovrednotenje jakosti sklopitve med elektroni in fononi. Posvetili se bomo tudi teoretičnim omejitvam nekonvencionalne superprevodnosti, kakršno da odbojna interakcija med elektroni. <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v angleščini.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><strong><span style='color:red'>Lepo vabljeni!</span></strong><strong><span style='font-weight:normal'><o:p></o:p></span></strong></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:black'>*****<o:p></o:p></span></p><p class=MsoNormal style='text-align:justify'><o:p> </o:p></p><p class=MsoNormal style='text-align:justify'>We would like to invite you to 10th lecture of the "Kolokvij na IJS" in the school year 2011/12. The lecture will be held <b>on Wednesday, January 25, 2012, at 1 pm</b> at the <b>JSI main lecture hall</b>, Jamova 39, Ljubljana. The abstract of the lecture can be found on website: <span style='font-size:10.0pt'><a href="http://www.ijs.si/ijsw/Koledar_prireditev"><span style='font-size:12.0pt'>http://www.ijs.si/ijsw/Koledar_prireditev</span></a></span>, the previous recorded lectures can be found on website: <span style='font-size:10.0pt'><a href="http://videolectures.net/kolokviji_ijs"><span style='font-size:12.0pt'>http://videolectures.net/kolokviji_ijs</span></a></span>.<span style='font-size:10.0pt'> </span><o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>********************************************<b><span lang=SL><o:p></o:p></span></b></p><p class=MsoNormal><b><o:p> </o:p></b></p><p class=MsoNormal><b>prof. dr. Viktor Kabanov<o:p></o:p></b></p><p class=MsoNormal><i>Jožef Stefan Institute, Department of Complex Matter<o:p></o:p></i></p><p class=MsoNormal><b><span style='font-size:16.0pt;mso-fareast-language:SL'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:16.0pt'>Superconductivity: Electron-phonon Coupling and Unconventional Pairing with Repulsive Interaction<o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>The quest for better superconductors, with higher transition temperatures that perform at higher magnetic fields and lead to higher critical currents is one of the major challenges in condensed matter physics. In the Bardeen–Cooper–Schrieffer theory of superconductivity, electrons form Cooper pairs as a result of an interaction mediated by vibrations in the underlying crystal structure (phonons). In my talk I will review different experimental techniques which allow an evaluation of the strength of the interaction between electrons and phonons. The theoretical constraints for an unconventional superconductivity caused by repulsive interaction will be also discussed.<o:p></o:p></p><p class=MsoNormal style='text-align:justify'><o:p> </o:p></p><p class=MsoNormal><b><span style='font-size:14.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt'>We look forward to meeting you at the “Kolokvij na IJS”!<o:p></o:p></span></b></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal align=center style='text-align:center'><span style='font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D'><o:p> </o:p></span></p></div></body></html>