sangita bose, bombay
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Sangita Bose, Bombay. Welcome !!!. Antonio Bianconi , Rome . A. Garcia-Garcia, Cambridge. Carbon Superconductors. STO/LAO Heterostructures. Mesoscopic effects in conventional superconductors. High T c heterostructures. TRANSCRIPT
Sangita Bose, Bombay
Antonio Bianconi, Rome
Welcome !!!
A. Garcia-Garcia, Cambridge
Mesoscopic effects in conventional
superconductors
High Tc heterostructures
STO/LAO Heterostructures
Carbon Superconductors
<< BCS≥ No BCS
How to enhance SC substantially?
$10 Question
$106 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 ResonancesBlatt, Thompson
Phys. Lett. 5, 6 (1963)
Shell EffectsParmenter, Phys. Rev. 166,
392 (1967)
Thin Films Single grains <
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)
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
Schneider, et al., PRL 102, 207002 (2009)
Islands
PRL 108, 126802 (2012)
Ribeiro, AGG. PRL 108, 097004 (2012)
Theory:
?
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)
?
Mason, Goldbart et al, Nature Physics 8 59 (2012)
Josephson junctions
SMS
Spin Filtered
Blamire et al, Nature Materials 10 849 (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 Tc
Bianconi, Perali, at al, Solid State Comm, 100, 181 (1996)
>
Blatt’s Shape resonances for
high Tc SC
Cuprates high Tc Heterostructures
Bozovic et al., Nature 455, 782 (2008)
SC 1 Single Layer Intrinsic inhomogeneities
Why?
Xue et al.: Arxiv: 12015694
Iron Pnictides Heterostructures
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)
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
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)
CONTROL
PREDICTIVE POWER
Enhancement = $106
Theory
THANKS!
Conference dinner
Lunch < 1:45PM
Tomorrow, 7:30PMEverybody is invited!
Talks on time!