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Superconduttori a P = 1 atm

Superconduttori ad alta pressione

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Pnictidi e calcogenidi

(Fe-based)

(scoperti nel 2006)

Tc = 43 K Di-Boruro di Magnesio (MgB2)

scoperto nel 2001 (per caso?)

Tc = 39 K

(Italy) ;#-<+-.#<=-(.#)*8&*>-.#'>*-.).#

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110 K

Bi-2223

YBCO

92 K

9 K

Nb-Ti

18 K

Nb3Sn 39 K MgB2

56 K

LaFeAsO

Con la Tc aumenta anche la complessità

dei composti

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(La,Ba)2CuO4 Tc=38K Presentano celle unitarie strutturate a layer.

Ognuno dei layer ha una sua funzione nello stabilire le proprietà superconduttive.

catene Cu-O: funzionano da riserve di portatori di carica

piani Cu-O2: sono i piani dove risiede la superconduttività

ossigeni apicali: regolano lo scambio di portatori tra piani e catene

layer isolanti: regolano la valenza del rame nei piani Cu-O

Questa struttura determina una forte anisotropia sia delle proprietà microscopiche sia di quelle macroscopiche (Jc, Hc)

le proprietà superconduttive dipendono fortemente dalla densità dei portatori!!

Superconductor

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COATED CONDUCTOR

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