Sangita Bose, Bombay
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Sangita Bose, Bombay
Antonio Bianconi, Rome
Welcome !!!
A. Garcia-Garcia, Cambridge
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Mesoscopic effects in conventional
superconductors
High Tc heterostructures
STO/LAO Heterostructures
Carbon Superconductors
<< BCS≥ No BCS
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How to enhance SC substantially?
$10 Question
$106 Question
Mechanism of SC in cuprates?
Enhancement?
?
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Why control?
Grains and thin films in conventional superconductors
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Abeles, Cohen, Cullen, Phys. Rev. Lett., 17, 632 (1966) A.M. Goldman, Giaver.....
Thin films
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Shape ResonancesBlatt, Thompson
Phys. Lett. 5, 6 (1963)
Shell EffectsParmenter, Phys. Rev. 166,
392 (1967)
Thin Films Single grains <
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Ralph, Black,Tinkham,
Superconductivity in
Single Metal Particles PRL 74, 3241-3244
(1995).No isolated, size/shape unknown
Theory beyond BCS ~
FluctuationsRichardson Equations
J. von Delft et al., Phys. Rep., 345, 61 (2001)
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Xue et al., Science 306, 1915 (2004) Shih et al., Science 324, 1314 (2009)
Thin Films
PRB 74 132504 (2006) Shanenko, Peeters, PRB 75 014519 (2007)
> atomic scale control of the thickness over a
macroscopic area
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Schneider, et al., PRL 102, 207002 (2009)
Islands
PRL 108, 126802 (2012)
Ribeiro, AGG. PRL 108, 097004 (2012)
Theory:
?
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S. Bose, AGG., Nature Materials 9, 550 (2010), PRB 84 104525 (2011)
GrainsSn
Pb
Theory:
PRB, 74, 052502 (2006)
PRL 100, 187001 (2008)
PRL 108, 097004 (2012)
?
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Mason, Goldbart et al, Nature Physics 8 59 (2012)
Josephson junctions
SMS
Spin Filtered
Blamire et al, Nature Materials 10 849 (2011)
Kresin, Deutscher
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+Experimental Control
+Predictive power
No Control
Theoreticians Drift
High Tc superconductors?
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Bianconi, et al. Solid State Comm, 89, 933 (1994)
Stripes
Quantum size effects in high Tc
Bianconi, Perali, at al, Solid State Comm, 100, 181 (1996)
>
Blatt’s Shape resonances for
high Tc SC
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Cuprates high Tc Heterostructures
Bozovic et al., Nature 455, 782 (2008)
SC 1 Single Layer Intrinsic inhomogeneities
Why?
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Xue et al.: Arxiv: 12015694
Iron Pnictides Heterostructures
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Enhancement of Tc by disorder
Bianconi, et al., Nature 466, 841 (2010)
Fractal distributions of dopants enhance
Tc in cuprates
Inhomogeneities Higher Tc
PRL 108, 017002 (2012)
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LaAlO3 /SrTiO3
Heterostructures
Triscone, Nature 456 624 (2008)
Control &Tunability
Spin-OrbitDisorder
Magnetism
PRB 85 020457 (2012)PRL 104, 126803 (2010)
Anderson, Mott Localization
Exotic Quantum Matter
Lesueur, arXiv:1112.2633
E Field effect
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Carbon nanotubes FluctuationsHigh Tc?
How to suppress fluctuations?
<
Yang,PRB 74 155414 (2006)
Phys. Rev. Lett. 86, 2416 (2001)
Science 292, 2462 (2001)
Electric field effect
Dissipation Ropes
Single
Phase SlipsLehtinen, PRB 85 094508 (2012)
PRB 80, 214515 (2009)
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CONTROL
PREDICTIVE POWER
Enhancement = $106
Theory
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THANKS!
Conference dinner
Lunch < 1:45PM
Tomorrow, 7:30PMEverybody is invited!
Talks on time!