Magnetism and superconductivity of an electron-doped superconductor (Sr1-xLax)2

K. M. Kojima, K. Kawashima, M. Fujita, K. Yamada, M. Azuma, M. Takano, A. Koda, K. Ohishi, W. Higemoto, R. Kadono, Y. J. Uemura

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6 Citations (Scopus)


We investigated the infinite-layer electron-doped cuprate superconductor (Sr1-xLax)CuO2 with the muon spin relaxation (μSR) technique. Zero-field measurements detect a slowing down of magnetic moments at a characteristic temperature (TN1), below which the volume fraction of the magnetic region increases as the sample is cooled. Below the doping concentration x<0.10, an onset of the (quasi) static order occurs at another characteristic temperature (TN2). The magnetic volume fraction increases under application of a magnetic field, suggesting that magnetism may be enhanced by an external field. As a function of the doping concentration, the superconducting transition temperature (Tc≈42K) remains constant, but the Meissner fraction reaches a maximum at x=0.1. The transverse-field μSR exhibits an increase of the relaxation rate below Tc, which reaches to σ(T→0)≈4.5μs-1 for x=0.1 doping. This relaxation rate is about 4 times larger than the one expected from the Uemura relation, and there may be a contribution from the field-induced magnetism to the relaxation rate.

Original languageEnglish
Pages (from-to)207-210
Number of pages4
JournalPhysica B: Condensed Matter
Publication statusPublished - 2006 Mar 31
EventProceedings of the Tenth International Conference on Muon Spin Rotation, Relaxation and Resonance -
Duration: 2005 Aug 82005 Aug 12


  • Electron-doped high-T superconductor
  • Muon-spin rotation


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