Phase diagram of pnictide superconductors
Phase diagram of pnictide superconductors
Phase diagram of pnictide superconductors
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Zero field μSR: : CeO 1-x Fe x As<br />
magnetic volume fraction<br />
CeO 1-x<br />
F x<br />
FeAs<br />
100%<br />
80%<br />
60%<br />
40%<br />
20%<br />
0%<br />
zero field μSR<br />
0 20 40 60 80 100 120 140 160 180<br />
temperature (K)<br />
undoped<br />
5% F-content<br />
10% F-content<br />
15% F-content<br />
50%<br />
Determine T N<br />
(Fe) from magnetic volume:<br />
• e.g.50% <strong>of</strong> signal shows static relaxation<br />
• Strong reduction <strong>of</strong> T N<br />
for x>0!<br />
Appearance <strong>of</strong> µSR frequency<br />
Long range coherent<br />
sublattice magnetization<br />
• Strong reduction <strong>of</strong> sublattice<br />
magnetization for x>0<br />
µSR frequency (MHz)<br />
35<br />
30<br />
25<br />
20<br />
15<br />
10<br />
5<br />
0<br />
0 20 40 60 80 100 120 140 160 180<br />
temperature (K)<br />
H. Maeter, et al., in preparation.<br />
• No long range order for<br />
x=0.15<br />
• but short range magnetic order<br />
present with f µ<br />
(T)=0!<br />
Mean sublattice magnetization = 0<br />
not visible in neutron scattering
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