Phase diagram of pnictide superconductors
Phase diagram of pnictide superconductors
Phase diagram of pnictide superconductors
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LaOFeAs: Competing OP above T S ?<br />
Lattice constant (Å)<br />
8.74<br />
8.72<br />
5.70<br />
5.68<br />
XRD<br />
c<br />
b<br />
a<br />
Cmma<br />
P4/nmm<br />
dT<br />
dp<br />
N<br />
=<br />
TV<br />
negative!<br />
Δα<br />
Δc<br />
p<br />
α (10 -6 K -1 )<br />
12<br />
9<br />
6<br />
3<br />
Thermal<br />
Expansion<br />
0<br />
0 50 100 150 200 250<br />
T (K)<br />
specific<br />
heat anomaly<br />
6<br />
4<br />
2<br />
0<br />
Δc p<br />
(J/molK)<br />
at T S :<br />
upturn truncated<br />
⎛ ∂V<br />
⎞ ⎛ ∂S<br />
⎞<br />
⎜ ⎟ ∝ −⎜<br />
⎟<br />
⎝ ∂T<br />
⎠ p ⎝ ∂p<br />
⎠T<br />
positive pressure<br />
dependence!<br />
L. Wang et al., arXiv:0903.1235
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