OPOMNIK: IJS KOLOKVIJ, sreda, 30. september 2009, prof. Pietro Carretta

[Andreja Berglez]

Vabim vas na 1. predavanje iz sklopa "Kolokviji na IJS" v letu 2009/10, ki
bo v sredo, 30. septembra 2009, ob 13:00 uri v Veliki predavalnici Instituta
>Jožef Stefan< na Jamovi cesti 39 v Ljubljani. Napovednik predavanja najdete
tudi na naslovu http://www.ijs.si/ijsw/Koledar_prireditev, posnetke
preteklih predavanj pa na http://videolectures.net/kolokviji_ijs. 

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Prof. Pietro Carretta, 

University of Pavia, Pavia, Italy  

 

 

NMR in mSR študija SmFeAsO1-xFx družine superprevodnikov

 

 

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.

 

Predavanje bo v angleščini.

Lepo vabljeni!

***

 

We would like to invite you to 1st lecture of the "Kolokvij na IJS" in the
school year 2009/10. The lecture will be held on Wednesday, September 30,
2009, at 1 pm at JSI main lecture hall, Jamova 39, Ljubljana. The abstract
of the lecture can be found on website:
<http://www.ijs.si/ijsw/Koledar_prireditev>
http://www.ijs.si/ijsw/Koledar_prireditev, the previous recorded lectures
can be found on website:  <http://videolectures.net/kolokviji_ijs>
http://videolectures.net/kolokviji_ijs. 

********************************************

Prof. Pietro Carretta, 

University of Pavia, Pavia, Italy 

 

NMR and mSR in SmFeAsO1-xFx superconductors

 

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 London
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.

 

 

We look forward to meeting you at the "Kolokvij na IJS"!

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