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</o:shapelayout></xml><![endif]--></head><body lang=SL link=blue vlink=purple><div class=WordSection1><p class=MsoNormal>Vabimo vas na 5. predavanje iz sklopa "Kolokviji na IJS" v letu 2017/18, ki bo <b><span style='color:red'>v sredo, 31. januarja 2018, ob 13. uri </span></b><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><span lang=EN-US style='mso-fareast-language:ZH-CN'>prof. dr. Denis Arčon<o:p></o:p></span></b></p><p class=MsoNormal><i><span lang=EN-US style='mso-fareast-language:ZH-CN'>Institut Jožef Stefan in Fakulteta za matematiko in fiziko, Univerza v Ljubljani, Ljubljana, Slovenija </span></i><b><span lang=EN-US style='mso-fareast-language:ZH-CN'><o:p></o:p></span></b></p><p class=MsoNormal><b><span style='font-size:14.0pt'><o:p> </o:p></span></b></p><p class=MsoNormal align=center style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:center'><b><span style='font-size:16.0pt'>Frustracija v antiferomagnetnih sistemih – laboratorij za nova stanja snovi<o:p></o:p></span></b></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Prehod iz paramagnetnega v feromagnetno ali pa antiferomagnetno stanje je eden najbolj standardnih primerov zloma simetrije v kondenzirani snovi. Pod značilno temperaturo, Curijevo v primeru feromagnetov in Néelovo v primeru antiferomagnetov, se magnetni momenti uredijo vzdolž določene kristalne smeri. V nekaterih primerih antiferomagnetov pa magnetni sistem paroma ne more minimalizirati vseh interakcij – takrat govorimo o geometrijski frustraciji. Posledice geometrijske frustracije se odražajo v močnem znižanju Néelove temperature in stanju z zapleteno magnetno ureditvijo ali pa celo s stanjem, kjer se magnetni momenti ne uredijo vse do absolutne ničle. Predstavili bomo izbrana primera, kjer geometrijska frustracija igra pomembno vlogo: sistem frustriranih verig v β-TeVO<sub>4</sub> ter kvantno spinsko tekočino na trikotni mreži 1T-TaS<sub>2</sub> sistema. <o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;text-align:justify'>Predavanje bo v slovenščini.<o:p></o:p></p><p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><b><span style='font-family:"Calibri",sans-serif;color:red'>Lepo vabljeni!</span></b><o:p></o:p></p><p class=MsoNormal><span style='font-size:11.0pt;font-family:"Calibri",sans-serif;color:#1F497D'><o:p> </o:p></span></p></div></body></html>