Phase diagram of pnictide superconductors
Phase diagram of pnictide superconductors
Phase diagram of pnictide superconductors
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Resistivity at the stuctural and SDW transistions<br />
LaOFeAs<br />
T S<br />
ρ ∝<br />
1<br />
n<br />
1<br />
,<br />
λ<br />
Resistivity<br />
• Peak at T S<br />
enhanced scattering at higher T<br />
• Inflection point at T N<br />
reduced scattering<br />
5,0x10 -6 Ba(Fe 0.95<br />
Co 0.05<br />
) 2<br />
As 2<br />
4,0x10 -6<br />
Resistivity in Co doped systems<br />
ρ (Ωm)<br />
3,0x10 -6<br />
2,0x10 -6<br />
1,0x10 -6<br />
Single crystal!!<br />
• Reduction <strong>of</strong> scattering at T N<br />
smaller<br />
• Mean free path limited by disorder<br />
due to Co atoms!!<br />
0,0<br />
0 50 100 150 200 250 300<br />
T in K<br />
Intrinsic sources <strong>of</strong> scattering masked by disorder<br />
in Co doped single crystals!!!
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