Sangita Bose, Bombay Antonio Bianconi, Rome Welcome !!! A. Garcia-Garcia, Cambridge.

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Presentation transcript:

Sangita Bose, Bombay Antonio Bianconi, Rome Welcome !!! A. Garcia-Garcia, Cambridge

Mesoscopic effects in conventional superconductors High T c heterostructures STO/LAO Heterostructures Carbon Superconductors  <<  BCS  ≥  No BCS

How to enhance SC substantially? $10 Question $10 6 Question Mechanism of SC in cuprates? Enhancement? ?

Why control? Grains and thin films in conventional superconductors

Abeles, Cohen, Cullen, Phys. Rev. Lett., 17, 632 (1966) A.M. Goldman, Giaver..... Thin films

Shape Resonances Blatt, Thompson Phys. Lett. 5, 6 (1963) Shell Effects Parmenter, Phys. Rev. 166, 392 (1967) Thin FilmsSingle grains  < 

Ralph, Black,Tinkham, Superconductivity in S ingle Metal Particles PRL 74, (1995). No isolated, size/shape unknown Theory beyond BCS  ~  Fluctuations Richardson Equations J. von Delft et al., Phys. Rep., 345, 61 (2001)

Xue et al., Science 306, 1915 (2004)Shih et al., Science 324, 1314 (2009) Thin Films PRB (2006)Shanenko, Peeters, PRB (2007)  >  atomic scale control of the thickness over a macroscopic area

Schneider, et al., PRL 102, (2009) Islands PRL 108, (2012) Ribeiro, AGG. PRL 108, (2012) Theory:  ?  ? 

S. Bose, AGG., Nature Materials 9, 550 (2010), PRB (2011) Grains Sn Pb Theory: PRB, 74, (2006) PRL 100, (2008) PRL 108, (2012)  ?  ? 

Mason, Goldbart et al, Nature Physics 8 59 (2012) Josephson junctions SMS Spin Filtered Blamire et al, Nature Materials (2011) Kresin, Deutscher

+Experimental Control +Predictive power No Control Theoreticians Drift High Tc superconductors?

Bianconi, et al. Solid State Comm, 89, 933 (1994) Stripes Quantum size effects in high T c Bianconi, Perali, at al, Solid State Comm, 100, 181 (1996)  >  Blatt’s Shape resonances for high T c SC

Cuprates high T c Heterostructures Bozovic et al., Nature 455, 782 (2008) SC 1 Single Layer Intrinsic inhomogeneities Why?

Xue et al.: Arxiv: Iron Pnictides Heterostructures

Enhancement of Tc by disorder Bianconi, et al., Nature 466, 841 (2010) Fractal distributions of dopants enhance Tc in cuprates InhomogeneitiesHigher T c PRL 108, (2012)

LaAlO 3 /SrTiO 3 Heterostructures Triscone, Nature (2008) Control &Tunability Spin-Orbit Disorder Magnetism PRB (2012) PRL 104, (2010) Anderson, Mott Localization Exotic Quantum Matter Lesueur, arXiv: E Field effect

Carbon nanotubes Fluctuations High Tc? How to suppress fluctuations? << Yang,PRB (2006) Phys. Rev. Lett. 86, 2416 (2001) Science 292, 2462 (2001) Electric field effect Dissipation Ropes Single Phase Slips Lehtinen, PRB (2012) PRB 80, (2009)

CONTROL PREDICTIVE POWER Enhancement = $10 6 Theory

THANKS! Conference dinner Lunch < 1:45PM Tomorrow, 7:30PM Everybody is invited! Talks on time!