Superfluid Density and Field-Induced Magnetism in Ba(Fe1-xCox)2As2 and Sr(Fe1-xCox)2As2 Measured with Muon Spin Relaxation

Abstract

We report muon spin rotation ($\mu$SR) measurements of single crystal Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ and Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$. From measurements of the magnetic field penetration depth $\lambda$ we find that for optimally- and over-doped samples, $1/\lambda (T\to 0{)}^2$ varies monotonically with the superconducting transition temperature T${}_{\mathrm{C}}$. 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.

arXiv comment7 pages, accepted for publication in Phys. Rev. B

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• Local measurement of the superfluid density in the pnictide superconductor Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ across the superconducting dome
• Thermodynamic parameters of single- or multi-band superconductors derived from self-field critical currents
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• Effect of annealing on the specific heat of Ba(Fe1-xCox)2As2
• Universal scaling of the self-field critical current in superconductors: from sub-nanometre to millimetre size
• Muon spin rotation study of magnetism and superconductivity in Ba(Fe1-xCox)2As2 single crystals
• Measurements of the lower critical field of superconductors using NV centers in diamond optical magnetometry
• Nodeless Superconductivity and its Evolution with Pressure in the Layered Dirac Semimetal 2M-WS_2
• Using electron irradiation to probe iron - based superconductors
• A brief review on muSR studies of unconventional Fe and Cr-based superconductors
• Magnetism and Disorder Effects on muSR Measurements of the Magnetic Penetration Depth in Iron-Based Superconductors
• Quantum phase transition inside the superconducting dome of Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ probed by optical magneto-sensing using NV-centers in diamond
• Microscopic Coexistence of Magnetism and Superconductivity in charge compensated Ba1-xKx(Fe1-yCoy)2As2
• Muon-spin rotation measurements of the magnetic penetration depth in the Fe-based superconductor Ba_(1-x)Rb_(x)Fe2As2
• Evidence for a vortex-glass transition in superconducting Ba(Fe${}_{0.9}$Co${}_{0.1}$)${}_2$As${}_2$
• ${}^{75}$As NMR of Ba(Fe${}_{0.93}$Co${}_{0.07}$)${}_2$As${}_2$ in High Magnetic Field
• Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba${}_{1-x}$K${}_x$Fe${}_2$As${}_2$
• Disentangling superconducting and magnetic orders in NaFe_1-xNi_xAs using muon spin rotation
• NMR investigation of vortex dynamics in Ba(Fe0.93Rh0.07)2As2 superconductor
• Scaling of the physical properties in Ba(Fe,Ni)2As2 single crystals: Evidence for quantum fluctuations
• Correlation between unconventional superconductivity and strange metallicity revealed by operando superfluid density measurements
• Evidence of diamagnetic fluctuations above Tc in BaFe2-xCoxAs2 single crystals