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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
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YBCO
92 K
9 K
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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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