The superconductor KxSr1-xFe2As 2: Normal state and superconducting properties

B. Lv, M. Gooch, B. Lorenz, F. Chen, A. M. Guloy, C. W. Chu

Research output: Contribution to journalArticlepeer-review

36 Citations (Scopus)


The normal state and superconducting properties are investigated in the phase diagram of KxSr1-xFe2As2 for 0 ≤ x ≤ 1. The ground state upper critical field, Hc2(0), is extrapolated from magnetic field-dependent resistivity measurements. H c2(0) scales with the critical temperature, Tc, of the superconducting transition. In the normal state, the Seebeck coefficient is shown to experience a dramatic change near a critical substitution of x ∼ 0.3. This is associated with the formation of a spin density wave state above the superconducting transition temperature. The results provide strong evidence for the reconstruction of the Fermi surface with the onset of magnetic order.

Original languageEnglish
Article number025013
JournalNew Journal of Physics
Publication statusPublished - 2009 Feb 27

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)


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