[seminar] podsjetnik na SUTRAŠNJI seminar na IF-u u PETAK, 27. 05. 2011. u 10:00
Ivica Zivkovic
zivkovic at ifs.hr
Thu May 26 14:42:59 CEST 2011
*Poštovani,*
*podsjećamo Vas na sutrašnji seminar **na* *Institutu za fiziku u 10:00
sati:*
*
*
*Institut za fiziku, Bijenička cesta 46,*
*predavaonica u zgradi Mladen Paić*
*petak, 27. svibnja 2011, u 10:00 sati*
*Doping, Strains, Disorder and Electric Field Effect on*
*Superconductivity in Ultra-Thin La*_*2-x* *Sr*_*x* *CuO*_*4* *Films*
*Prof. Davor Pavuna*
*Physics of Complex Matter, Station 3, *
*EPFL, CH-1015 Lausanne, Switzerland*
/*E-mail: */_/*davor.pavuna at epfl.ch*/
<mailto:zvonko.trontelj at fmf.uni-lj.si>_
*I briefly review main results of our systematic experiments on strained
thin films of LSCO-214 grown by laser ablation [1-3], and then discuss
recent method to smoothly tune the carrier concentration of MBE grown
LSCO monolayer by means of an applied electric field [4,5]. Thin film
devices were made in an electrical double layer transistor configuration
utilizing an ionic liquid as gate electrolyte. **Very large fields and
induced changes in surface carrier density enable shifts in the critical
temperature by up to 30 K. As **reported elsewhere in more detail [4],
dozens of reproducible resistance vs temperature and carrier density
curves were recorded and have shown to collapse onto a single function
as predicted for a two-dimensional superconductor-insulator transition.
The observed critical resistance is precisely the quantum resistance for
pairs, R*_*Q* * = h/(2e)*^*2* * = 6.45 k?, suggestive of a phase
transition driven by quantum phase fluctuations, and Cooper pair
(de)localization. The implications of these results and the ongoing
field effect studies on other materials will also be discussed [5].*
*1. D. Pavuna et al., Journal of Physics 108, 012040 (2008) and
references therein*
*2. C. Cancellieri et al., Phys. Rev. B76, 174520 (2007); EPFL Thesis
no. 4120 (2008)*
*3. D. Ariosa et al. Appl. Phys. Lett. 92, 092506 (2008) and references
therein*
*4. A. T. Bollinger, G. Dubuis, J. Yoon, D. Pavuna, J. Misewich, I.
Bozovic, Nature 472, 458 (2011)*
*5. G. Dubuis, A. T. Bollinger, D. Pavuna, I. Bozovic, unpublished (2011) *
_/*http://cream.epfl.ch/page-31521-en.html*/_
*Voditelji seminara IF-a: Vlasta Horvatić i Ivica Živković*
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