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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Vabim vas na 1. predavanje iz sklopa "Kolokviji na IJS" v
letu 2009/10, ki bo <strong><b><font color=red face="Times New Roman"><span
style='color:red'>v sredo, 30. septembra 2009, ob 13:00 uri </span></font></b></strong><font
color=red><span style='color:red'>v Veliki predavalnici Instituta »Jožef
Stefan«</span></font> 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<font color=blue><span style='color:blue'> </span></font>pa
na <a href="http://videolectures.net/kolokviji_ijs">http://videolectures.net/kolokviji_ijs</a>.
<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'>Prof. Pietro Carretta, <o:p></o:p></span></font></b></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-style:italic'>University of Pavia, Pavia, Italy </span></font></i><b><span
style='font-weight:bold'> </span></b><i><span style='font-style:italic'><o:p></o:p></span></i></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-style:italic'><o:p> </o:p></span></font></i></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-style:italic'><o:p> </o:p></span></font></i></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span
style='font-size:14.0pt;font-weight:bold'>NMR in </span></font></b><span
class=apple-style-span><b><font color="#333333" face=Symbol><span
style='font-family:Symbol;color:#333333;font-weight:bold'>m</span></font></b></span><b><font
size=4><span style='font-size:14.0pt;font-weight:bold'>SR študija SmFeAsO1-xFx
družine superprevodnikov<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span
style='font-size:14.0pt;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span
style='font-size:14.0pt;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Med nedavno
odkritimi pniktidnimi superprevodniki doseže najvišjo kritično temperaturo
SmFeAsO1-xFx družina (TC < 55 K). V predavanju bo podan pregled najnovejših
rezultatov meritev 19F jedrske magnetne resonance (NMR) ter mionske spinske
relaksacije na tej družini. Meritve 19F spin-mrežnega relaksacijskega časa
omogočajo vpogled v nizko-energijska vzbujena stanja znotraj Sm-plasti in
kažejo na obnašanje, ki je značilno za »heavy-fermion« sisteme z
magnetnim osnovnim stanjem. Superpevodni parameter reda je bil določen z
meritvami temperaturne odvisnosti širine 19F NMR signala. 19F NMR rezultati so
bili dodatno podkrepljeni z meritvami mionske spinske relaksacije, ki je zelo
učinkovito orodje pri določevanju Londonove vdorne dolžine ter možnem soobstoju
magnetizma in superprevodnosti na mikroskopskem nivoju. Narejena bo tudi
primerjava med SmFeAsO1-xFx in visokotemperaturnimi baker-oksidnimi
suprevodniki.<o:p></o:p></span></font></p>
<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt;
text-align:justify;text-justify:inter-ideograph'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>Predavanje bo v
angleščini.<o:p></o:p></span></font></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;margin-bottom:12.0pt'><strong><b><font
size=3 color=red face=Calibri><span style='font-size:12.0pt;font-family:Calibri;
color:red'>Lepo vabljeni!</span></font></b></strong><strong><b><font
face="Times New Roman"><span style='font-weight:normal'><o:p></o:p></span></font></b></strong></p>
<p class=MsoNormal align=center style='text-align:center'><b><font size=6
face="Times New Roman"><span lang=EN-US style='font-size:24.0pt;font-weight:
bold'>***<o:p></o:p></span></font></b></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'><o:p> </o:p></span></font></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>We would
like to invite you to 1<sup>st</sup> lecture of the "Kolokvij na IJS"
in the school year 2009/10. The lecture will be held <b><span style='font-weight:
bold'>on Wednesday, September 30, 2009, at 1 pm</span></b> at <b><span
style='font-weight:bold'>JSI main lecture hall</span></b>, Jamova 39, <st1:place
w:st="on"><st1:City w:st="on">Ljubljana</st1:City></st1:place>. The abstract of
the lecture can be found on website: </span></font><font size=2><span
lang=EN-US style='font-size:10.0pt'><a
href="http://www.ijs.si/ijsw/Koledar_prireditev"><font size=3><span
style='font-size:12.0pt'>http://www.ijs.si/ijsw/Koledar_prireditev</span></font></a></span></font><span
lang=EN-US>, the previous recorded lectures can be found on website: </span><font
size=2><span lang=EN-US style='font-size:10.0pt'><a
href="http://videolectures.net/kolokviji_ijs"><font size=3><span
style='font-size:12.0pt'>http://videolectures.net/kolokviji_ijs</span></font></a></span></font><span
lang=EN-US>.</span><font size=2><span lang=EN-US style='font-size:10.0pt'> </span></font><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='mso-margin-top-alt:auto;mso-margin-bottom-alt:auto'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>********************************************<br>
<br>
<o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'>Prof. Pietro Carretta, <o:p></o:p></span></font></b></p>
<p class=MsoNormal><i><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-style:italic'>University of Pavia, Pavia, Italy <o:p></o:p></span></font></i></p>
<p class=MsoNormal><b><font size=5 face="Times New Roman"><span lang=EN-US
style='font-size:16.0pt;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><b><font size=5 face="Times New Roman"><span lang=EN-US
style='font-size:16.0pt;font-weight:bold'>NMR and </span></font></b><span
class=apple-style-span><b><font color="#333333" face=Symbol><span lang=EN-US
style='font-family:Symbol;color:#333333;font-weight:bold'>m</span></font></b></span><b><font
size=5><span lang=EN-US style='font-size:16.0pt;font-weight:bold'>SR in
SmFeAsO1-xFx superconductors<o:p></o:p></span></font></b></p>
<p class=MsoNormal><b><font size=5 face="Times New Roman"><span lang=EN-US
style='font-size:16.0pt;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal style='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span lang=EN-US style='font-size:12.0pt'>Among
the recently discovered pnictide superconductors the highest superconducting
critical temperature has been measured for SmFeAsO1-xFx family (TC < 55 K).
A brief overview on recent results obtained by means of 19F nuclear magnetic
resonance and muon spin rotation in SmFeAsO1-xFx superconductors will be
presented. 19F nuclear spin-lattice relaxation, which allows to probe the
low-energy excitations within the Sm layers, shows a behavior which is rather
characteristic of heavy-fermion compounds with a magnetic ground-state. From
the temperature dependence of the NMR linewidth information on the static properties
of the flux lines lattice and on the superconducting order parameter can be
derived. These results are compared with the ones obtained by muon spin
rotation, which represents a powerful tool to study the doping and temperature
dependence of the <st1:place w:st="on"><st1:City w:st="on">London</st1:City></st1:place>
penetration depth and to evidence the possible coexistence of superconductivity
and magnetism at the microscopic level. A comparison between the phenomenology
observed in cuprates and Fe-based superconductors will be made throughout the
seminar.<o:p></o:p></span></font></p>
<p class=MsoNormal><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span lang=EN-US
style='font-size:14.0pt;font-weight:bold'><o:p> </o:p></span></font></b></p>
<p class=MsoNormal><b><font size=4 face="Times New Roman"><span lang=EN-US
style='font-size:14.0pt;font-weight:bold'>We look forward to meeting you at the
“Kolokvij na IJS”!<o:p></o:p></span></font></b></p>
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