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<p class=MsoNormal><font size=3 face="Times New Roman"><span style='font-size:
12.0pt'>Vabim vas na 18. predavanje iz sklopa "Kolokviji na IJS" v
letu 2008/09, ki bo <strong><b><font color=red face="Times New Roman"><span
style='color:red'>v petek, 5. junija 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 style='margin-bottom:12.0pt'><font size=3
face="Times New Roman"><span style='font-size:12.0pt'>~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<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. Wojciech Grochala, <o:p></o:p></span></font></b></p>
<p class=MsoNormal style='margin-bottom:6.0pt'><i><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-style:italic'>Faculty
of Chemistry, University of Warsaw, Pasteur 1, 02093 Warsaw Poland,<o:p></o:p></span></font></i></p>
<p class=MsoNormal style='margin-bottom:6.0pt'><i><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-style:italic'>Laboratory
of Technology of Novel Functional Materials, Interdisciplinary Center for
Mathematical in<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'>Computational Modelling, University
of Warsaw, Pawinskiego 5a, 02106 Warsaw Poland </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'>Iskanje superprevodnosti v spojinah
z dvovalentnim srebrom: 8 let po napovedi<o:p></o:p></span></font></b></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='text-align:justify;text-justify:inter-ideograph'><font
size=3 face="Times New Roman"><span style='font-size:12.0pt'>Fluor je med vsemi
kemijskimi elementi najbolj elektronegativen. Zato ima večina binarnih ali
višjih anorganskih fluoridov veliko izolatorsko energijsko vrzel. Poznamo le
nekaj kovinskih fluoridov, vendar v teh primerih fluorove valenčne orbitale le
malo prispevajo k elektronskim transportnim pojavom. V tem prispevku bomo
pokazali najnovejše teoretične izračune TM fluoridov, ki kažejo na možnosti, da
bi lahko tvorili nov razred visokotemperaturnih superprevodnikov. Za to
potrebujemo močno mešanje fluorovih 2p- orbital s kovinskimi valenčnimi
funkcijami ter delno zasedenost pasov. V takem primeru napovedujemo nenavadno
močno sklopitev z mrežnimi nihanji ter potencialno superprevodno stanje pri
nizkih temperaturah. Ti pogoji so izpolnjeni za nenavadne fluoride na
osnovi dvovalentnega srebra - fluoridoargentati-(II), ki si delijo
mnoge lastnosti z bakrovimi oksidi. Na žalost so v vseh znanih tovrstnih
spojinah nesparjeni d-elektroni urejeni feromagnetno, v nasprotju z
antiferomagnetno ureditvijo v nedopiranih baker-oksidnih spojinah. Pokazali
bomo poskuse načrtovanja fluoridoargentatov(II) z antiferomagnetno
sklopitvijo.<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 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'>We
would like to invite you to 18<sup>th</sup> lecture of the "Kolokvij na
IJS" in the school year 2008/09. The lecture will be held <b><span
style='font-weight:bold'>on Friday, June 5, 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='margin-bottom:12.0pt'><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><b><font size=3 face="Times New Roman"><span
style='font-size:12.0pt;font-weight:bold'>Prof. Wojciech Grochala, </span></font></b><span
lang=EN-US><o:p></o:p></span></p>
<p class=MsoNormal style='margin-bottom:6.0pt'><i><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-style:italic'>Faculty
of Chemistry, University of Warsaw, Pasteur 1, 02093 Warsaw Poland<o:p></o:p></span></font></i></p>
<p class=MsoNormal style='margin-bottom:6.0pt'><i><font size=3
face="Times New Roman"><span style='font-size:12.0pt;font-style:italic'>Laboratory
of Technology of Novel Functional Materials, Interdisciplinary Center for
Mathematical and<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'>Computational Modelling, University
of Warsaw, Pawinskiego 5a, 02106 Warsaw Poland<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=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'>Quest for superconductivity in
compounds of divalent silver: 8 years after the prediction<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'>Fluorine
is the most electronegative among all chemical bond–forming elements.
Because of this, the vast majority of binary and higher inorganic fluorides are
high–melting large–band gap electronic insulators, which are
transparent in the visible region of the electromagnetic spectrum. Rare
examples of metallic fluorides are known, but valence orbitals of F marginally
participate in the electronic transport in these compounds. In this account we
describe recent theory–driven attempts to turn a family of TM fluorides
into a novel class of high–temperature superconductors. Substantial
mixing of F’s 2p orbitals and metal valence functions (‘covalence’)
as well as partial band occupation are needed to generate band crossing judged
responsible for unusually strong vibronic coupling and for the appearance of
superconductivity. This precondition is satisfied for unusual fluorides of
divalent silver – fluoroargentates (II). These fascinating materials
share lots of common features with oxides of Cu(I). Unfortunately, in all known
layered fluorides of silver (II) the unpaired d electrons of silver order
ferromagnetically. This is in contrast to antiferromagnetic ordering observed
for undoped oxocuprates. In this account attempts will be described of
crystal-engineering of fluoroargentates (II) which target a layered
antiferromagnetic precursor of a superconductor.<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>
<p class=MsoNormal><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='mso-margin-top-alt:auto;margin-bottom:12.0pt;
text-align:justify;text-justify:inter-ideograph'><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>
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