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APS » Journals » Phys. Rev. Lett. » Volume 103 » Issue 6
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Phys. Rev. Lett. 103, 067010 (2009) [4 pages]

Superconductivity and Field-Induced Magnetism in SrFe1.75Co0.25As2

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R. Khasanov1,*, A. Maisuradze1, H. Maeter2, A. Kwadrin2, H. Luetkens1, A. Amato1, W. Schnelle3, H. Rosner3, A. Leithe-Jasper3, and H.-H. Klauss2
1Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, CH-5232 Villigen PSI, Switzerland
2IFP, Technische Universität Dresden, 01069 Dresden, Germany
3Max-Planck-Institut für Chemische Physik fester Stoffe, Nöthnitzer Str. 40, 01187 Dresden, Germany

Received 6 March 2009; published 7 August 2009

Using muon-spin rotation, we studied the in-plane (λab) and the out of plane (λc) magnetic field penetration depth in SrFe1.75Co0.25As2 (Tc≃13.3  K). The penetration depth anisotropy γλ=λc/λab increases from γλ≃2.1 at Tc to 2.7 at 1.6 K. The mean internal field in the superconducting state increases with decreasing temperature, just opposite to the diamagnetic response seen in magnetization experiments. This unusual behavior suggests that the external field induces a magnetic order which is maintained throughout the whole sample volume.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.103.067010
DOI:
10.1103/PhysRevLett.103.067010
PACS:
74.70.−b, 74.25.Ha, 76.75.+i

*Corresponding author: rustem.khasanov@psi.ch

 
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