Phase diagram of pnictide superconductors
Phase diagram of pnictide superconductors
Phase diagram of pnictide superconductors
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α (10 -6 /K)<br />
14<br />
12<br />
10<br />
8<br />
6<br />
T s<br />
LaOFeAs<br />
Thermal Expansion<br />
• large fluctuation region at T>T S<br />
M/B (10 -4 emu / mol)<br />
ρ (mΩ cm)<br />
4<br />
3<br />
2<br />
7<br />
6<br />
5<br />
T N<br />
100 150 200 250 300<br />
T (K)<br />
Magnetisation:<br />
• linear T-dependence at high T,<br />
only weak changes due to fluctuations<br />
Resistivity<br />
• Peak at T S<br />
enhanced scattering in the fluctuation<br />
regime<br />
Strong link between<br />
electronic and structural<br />
degrees <strong>of</strong> freedom<br />
Wang et al., subm. to PRB
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