Journal
PHYSICAL REVIEW B
Volume 80, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.80.052503
Keywords
high-temperature superconductors; iron compounds; magnetic transition temperature; muon probes; samarium compounds; superconducting transition temperature
Funding
- A. Amato
- A. Martinelli
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We present Muon spectroscopy investigations on SmFeAsO1-xFx showing coexistence of magnetic order and superconductivity only in a very narrow F-doping range. The sharp crossover between the two types of order is similar to that observed in LaFeAsO1-xFx, suggesting a common behavior for the 1111 pnictides. The analysis of the muon asymmetry demonstrates that the coexistence must be nanoscopic, i.e., the two phases must be finely interspersed over a typical length scale of few nm. In this regime both the magnetic and the superconducting transition temperatures collapse to very low values. Our data suggest a competition between the two order parameters.
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