Abstract
We report muon spin rotation (μSR) measurements of single-crystal Ba (Fe1-x Cox) 2 As2 and Sr (Fe1-x Cox) 2 As2. From measurements of the magnetic field penetration depth λ we find that for optimally and overdoped samples, 1/λ ( T→0 ) 2 varies monotonically with the superconducting transition temperature TC. Within the superconducting state we observe a positive shift in the muon precession signal, likely indicating that the applied field induces an internal magnetic field. The size of the induced field decreases with increasing doping but is present for all Co concentrations studied.
Original language | English |
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Article number | 094512 |
Journal | Physical Review B - Condensed Matter and Materials Physics |
Volume | 82 |
Issue number | 9 |
DOIs | |
State | Published - Sep 20 2010 |
Externally published | Yes |