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<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT face="Times New Roman"
size=3>Vabim vas na 12. predavanje iz sklopa "Kolokviji na IJS" v letu 2007/08,
ki bo <STRONG><SPAN style="COLOR: red">v sredo, 13. februarja 2008, ob 13:00 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 </FONT><A href="http://www.ijs.si/ijsw/Koledar_prireditev"><FONT
face="Times New Roman"
size=3>http://www.ijs.si/ijsw/Koledar_prireditev</FONT></A><FONT
face="Times New Roman" size=3>, posnetke preteklih predavanj<SPAN
style="COLOR: blue"> </SPAN>pa na </FONT><A
href="http://videolectures.net/kolokviji_ijs"><FONT face="Times New Roman"
size=3>http://videolectures.net/kolokviji_ijs</FONT></A><FONT
face="Times New Roman" size=3>. </FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><FONT size=3><FONT
face="Times New Roman">~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~<BR><B
style="mso-bidi-font-weight: normal"><SPAN
style="mso-bidi-font-style: italic">Prof. Philippe
Mendels<o:p></o:p></SPAN></B></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify"><B
style="mso-bidi-font-weight: normal"><o:p><FONT face="Times New Roman"
size=3> </FONT></o:p></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><B
style="mso-bidi-font-weight: normal"><SPAN
style="FONT-SIZE: 14pt; mso-bidi-font-style: italic"><FONT
face="Times New Roman">Nova eksotična stanja v frustriranih antiferomagnetih
<o:p></o:p></FONT></SPAN></B></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify"><SPAN
style="FONT-SIZE: 11pt; mso-bidi-font-style: italic"><o:p><FONT
face="Times New Roman"> </FONT></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 35.4pt; TEXT-ALIGN: justify"><SPAN
style="FONT-SIZE: 11pt"><FONT face="Times New Roman">S pojmom frustracije in
degeneracije se v najbolj čisti obliki srečamo v magnetizmu. Močno frustrirani
magneti pogosto izkazujejo nova kvantna in klasična stanja kjer frustracija v
magnetnih interakcijah in makroskopska degeneracija igrata ključno vlogo. To
raziskovalno področje je neprestano rastlo v zadnjih dveh desetletjih, vse od
P.W. Andersonovega predloga modela resonančnih valenčnih stanj v
visokotemperaturnih superprevodnikih najprej osnovanega na modelu trikotnega
frustriranega antiferomagneta. <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 35.4pt; TEXT-ALIGN: justify"><SPAN
style="FONT-SIZE: 11pt"><FONT face="Times New Roman">V prvem delu predavanja
bomo vpeljal pojem frustriranih antiferomagnetov in nekatere pomembne parametre,
ki določajo fundamentalno nova osnovna stanja, kot so spinski led, spinska
tekočina ali druga podobna stanja. Pripravil bom tudi pregled ključnih
eksperimentov in eksperimentalnih sistemov. <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 35.4pt; TEXT-ALIGN: justify"><SPAN
style="FONT-SIZE: 11pt"><FONT face="Times New Roman">V drugem delu predavanja pa
se bom osredotočil na spinske tekočine in poudaril pomen dinamičnih in statičnih
informacij, ki jih lahko razberemo iz lokalnih tehnik, kot sta jedrska magnetna
resonanca in mionska spinska rotacija. <o:p></o:p></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 35.4pt; TEXT-ALIGN: justify"><SPAN
style="FONT-SIZE: 11pt"><FONT face="Times New Roman">V zadnjem delu pa bom
opisal nedavno sintetizirani sistem Herbertsmithite,
ZnCu<SUB>3</SUB>(OH)<SUB>6</SUB>Cl<SUB>2</SUB>, ki se je pojavil kot eden od
najbližjih približkov kvantne spinske tekočine [Physics Today, February
2007].<SPAN style="mso-spacerun: yes"> </SPAN></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 35.4pt; TEXT-ALIGN: justify"><SPAN
style="FONT-SIZE: 11pt"><FONT face="Times New Roman"><SPAN
style="mso-spacerun: yes"></SPAN><SPAN
style="mso-bidi-font-style: italic"><o:p></o:p></SPAN></FONT></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 12pt; mso-margin-top-alt: auto"><FONT
face="Times New Roman" size=3>Predavanje bo v angleščini.</FONT></P><PRE style="TEXT-ALIGN: justify"><SPAN style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'"><A href="http://old-www.u-psud.fr/anglais.nsf/index.htm!OpenPage">http://old-www.u-psud.fr/anglais.nsf/index.htm!OpenPage</A><o:p></o:p></SPAN></PRE>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"><I><FONT
size=3><FONT face="Times New Roman">University Paris-Sud 11 Orsay,
France</FONT></FONT></I></P><EM><FONT face="Times New Roman"
size=3></FONT></EM><SPAN style="FONT-FAMILY: Calibri">
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"><BR></SPAN><STRONG><SPAN
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: Calibri; mso-bidi-font-family: 'Courier New'">Lepo
vabljeni!</SPAN></STRONG></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"><STRONG><SPAN
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: Calibri; mso-bidi-font-family: 'Courier New'"></SPAN></STRONG> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"><SPAN
style="FONT-SIZE: 12pt; COLOR: red; FONT-FAMILY: Calibri; mso-bidi-font-family: 'Courier New'"><o:p><FONT
face="Times New Roman"><SPAN lang=EN-US style="mso-ansi-language: EN-US"><FONT
color=#000000>We would like to invite you to 12<SUP>th</SUP> lecture of the
"Kolokvij na IJS" in the school year 2007/08. The lecture will be held
<STRONG>on Wednesday, Feb 13 2008, at 1 pm</STRONG> at <STRONG>JSI main lecture
hall</STRONG>, Jamova 39, <st1:City w:st="on"><st1:place
w:st="on">Ljubljana</st1:place></st1:City>. The abstract of the lecture can be
found on website: </FONT></SPAN><SPAN><A
href="http://www.ijs.si/ijsw/Koledar_prireditev"><SPAN
style="FONT-SIZE: 12pt">http://www.ijs.si/ijsw/Koledar_prireditev</SPAN></A><FONT
color=#000000>, the previous recorded lectures can be found on website:
</FONT></SPAN><SPAN lang=EN-US
style="FONT-SIZE: 10pt; mso-ansi-language: EN-US"><A
href="http://videolectures.net/kolokviji_ijs"><SPAN
style="FONT-SIZE: 12pt">http://videolectures.net/kolokviji_ijs</SPAN></A></SPAN><FONT
color=#000000><SPAN lang=EN-US style="mso-ansi-language: EN-US">.</SPAN><SPAN
lang=EN-US style="FONT-SIZE: 10pt; mso-ansi-language: EN-US"> </SPAN><SPAN
lang=EN-US style="mso-ansi-language: EN-US"><o:p></o:p></SPAN></FONT></FONT></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="mso-ansi-language: EN-US"><FONT color=#000000><FONT
face="Times New Roman">********************************************<BR><SPAN
style="mso-bidi-font-style: italic"><STRONG>Prof. Philippe
Mendels<o:p></o:p></STRONG></SPAN></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-ansi-language: EN-US"><o:p><FONT face="Times New Roman"
color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-SIZE: 14pt; mso-bidi-font-style: italic; mso-ansi-language: EN-US"><STRONG><FONT
color=#000000><FONT face="Times New Roman">Novel States in Frustrated
Antiferromagnets<o:p></o:p></FONT></FONT></STRONG></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US
style="FONT-SIZE: 11pt; mso-bidi-font-style: italic; mso-ansi-language: EN-US"><o:p><FONT
face="Times New Roman" color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 36pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="FONT-SIZE: 11pt; mso-ansi-language: EN-US"><FONT
color=#000000><FONT face="Times New Roman">Frustration and degeneracy are at the
heart of much important science, from protein folding to emergent
electromagnetism, but reach their purest manifestation in magnetic materials.
Highly Frustrated Magnetism yields novel quantum and classical states where
frustration of interactions and macroscopic degeneracy play a leading role. The
field has been constantly growing for the past two decades after the seminal
proposal of an interpretation of High Temperature Superconductivity in terms of
a resonating valence bond state, first proposed in the context of triangular
frustrated antiferromagnets in the 70’s by P.W. Anderson.
<o:p></o:p></FONT></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 36pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="FONT-SIZE: 11pt; mso-ansi-language: EN-US"><FONT
color=#000000><FONT face="Times New Roman">In the first part of my talk, I’ll
introduce frustrated antiferromagnets and some of the important parameters which
lead to novel fundamental states such as spin ice, spin liquids and other
similar ground states. I’ll review some of the key experimental systems and
experiments.<o:p></o:p></FONT></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 36pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="FONT-SIZE: 11pt; mso-ansi-language: EN-US"><FONT
color=#000000><FONT face="Times New Roman">In the second part, I’ll focus on
spin liquids and will review in more details the relevance of the dynamical and
static information brought by local techniques such as Nuclear Magnetic
Resonance and Muon Spin Rotation.<o:p></o:p></FONT></FONT></SPAN></P>
<P class=MsoNormal
style="MARGIN: 0cm 0cm 0pt; TEXT-INDENT: 36pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="FONT-SIZE: 11pt; mso-ansi-language: EN-US"><FONT
color=#000000><FONT face="Times New Roman">I’ll finally give a brief overview on
a recently synthesized mineral, Herbertsmithite,
ZnCu<SUB>3</SUB>(OH)<SUB>6</SUB>Cl<SUB>2</SUB> which is the most promising
candidate for a quantum spin liquid [Physics Today, February
2007].<o:p></o:p></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-ansi-language: EN-US"><o:p><FONT face="Times New Roman"
color=#000000></FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-ansi-language: EN-US"><FONT color=#000000><FONT
face="Times New Roman"></FONT></FONT></SPAN> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; TEXT-ALIGN: justify"><SPAN
lang=EN-US style="mso-ansi-language: EN-US"><FONT color=#000000><FONT
face="Times New Roman">The lecture will be given in
English.<o:p></o:p></FONT></FONT></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="mso-ansi-language: EN-US"><o:p><FONT face="Times New Roman"
color=#000000></FONT></o:p></SPAN></P><PRE style="TEXT-ALIGN: justify"><SPAN lang=EN-US style="FONT-SIZE: 12pt; FONT-FAMILY: 'Times New Roman'; mso-ansi-language: EN-US"><A href="http://old-www.u-psud.fr/anglais.nsf/index.htm!OpenPage">http://old-www.u-psud.fr/anglais.nsf/index.htm!OpenPage</SPAN><I><SPAN lang=EN-US style="mso-ansi-language: EN-US"><FONT color=#000000><FONT face="Times New Roman"></FONT></FONT></SPAN></I></A></PRE><PRE style="TEXT-ALIGN: justify"><I><SPAN lang=EN-US style="mso-ansi-language: EN-US"><FONT color=#000000><FONT face="Times New Roman">University Paris-Sud 11 <st1:place w:st="on"><st1:City w:st="on">Orsay</st1:City>, <st1:country-region w:st="on">France</st1:country-region></st1:place><o:p></o:p></FONT></FONT></SPAN></I></PRE>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="mso-ansi-language: EN-US"><o:p><FONT face="Times New Roman"
color=#000000></FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="mso-ansi-language: EN-US"><o:p><FONT face="Times New Roman"
color=#000000> </FONT></o:p></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt"><SPAN lang=EN-US
style="FONT-SIZE: 14pt; mso-ansi-language: EN-US"><STRONG><FONT
color=#000000><FONT face="Times New Roman">We look forward to meeting you at the
“Kolokvij na IJS”!<o:p></o:p></FONT></FONT></STRONG></SPAN></P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"><FONT
face=Arial color=#000000 size=2></FONT> </P>
<P class=MsoNormal style="MARGIN: 0cm 0cm 0pt; mso-outline-level: 1"><FONT
face=Arial color=#000000 size=2></FONT></o:p></SPAN> </P></FONT></DIV>
<DIV><FONT face=Arial size=2>____________________________________<BR>Marta
Vidrih, univ.dipl.ekon.<BR>F5 - Odsek za fiziko trdnih snovi<BR>Institut "Jožef
Stefan", Jamova 39, Ljubljana<BR>tel: 01 477 39
02<BR></FONT></DIV></BODY></HTML>