S. Kuroshima

Publications (4)1.01 Total impact

• Source

  Available from: arxiv.org

  Article: Magnetic and superconducting phase diagram of electron-doped Pr$_{1-x}$LaCe$_{x}$CuO$_{4}$

  M Fujita, T Kubo, S. Kuroshima, T Uefuji, K Kawashima, K Yamada, I Watanabe, K Nagamine
  [show abstract] [hide abstract]
  ABSTRACT: We have investigated the magnetism and the superconductivity of an electron-doped Pr$_{1-x}$LaCe$_{x}$CuO$_{4}$ (PLCCO) using single crystal and powder samples by means of zero-field muon spin rotation/relaxation (ZF-$\mu$SR) and magnetic susceptibility measurements. Muon spin rotation corresponding to antiferromagnetic (AF) order was observed in the sample with 0.04$\leq${\it x}$\leq$0.11. Changes in magnetic properties of Cu spins upon Ce doping were revealed because the effect of the rare earth moment was negligible. Bulk superconductivity was identified in a wide Ce concentration range of 0.09$\leq${\it x}$\leq$0.20 with a maximum transition temperature of 26 K. At low temperatures, the superconducting (SC) phase abruptly appears by doping with linking quick destroy of the AF ordered phase at {\it x}$\sim$0.09, indicating the competitive relation between two phases. Comment: 4 pages, 4figures
  03/2002;
• Article: Magnetic and superconducting phase diagram of electron-doped Pr1-xLaCexCuO4

  M Fujita, T Kubo, S. Kuroshima, T Uefuji, K Kawashima, K Yamada, I Watanabe, K Nagamine
• Article: Superconducting phase diagram of electron-doped cuprates Nd2−xCexCuO4

  T. Uefuji, S. Kuroshima, M. Fujita, K. Yamada
  [show abstract] [hide abstract]
  ABSTRACT: Detailed superconducting (SC) phase diagram of electron-doped cuprates Nd2−xCexCuO4 has been studied by magnetic susceptibility measurements on single crystals with Ce concentration x up to 0.17. On increasing x, fractional superconductivity appears at around x=0.075. On further doping, bulk superconductivity sets in at around x=0.135, where the volume fraction of antiferromagnetic phase drastically degrades. SC samples with different onset Tc∼20 and 25 K were prepared by heat treatment in both fractional and bulk SC phases at a fixed x, and there exists no region where the onset Tc depends on doping in the studied x-region. The boundary between fractional and bulk SC phases slightly shifts depending on the conditions of heat treatment.
  Physica C: Superconductivity.
• Article: Neutron-scattering study of spin correlations in electron-doped Pr0.89LaCe0.11CuO4 single crystals

  M. Fujita, S. Kuroshima, M. Matsuda, K. Yamada
  [show abstract] [hide abstract]
  ABSTRACT: We have performed neutron-scattering measurements on the single crystals of electron-doped cuprate, Pr0.89LaCe0.11CuO4−δ in order to study the relationship between spin correlations and the superconductivity. In the non-superconducting as-grown x=0.11 sample, clear magnetic Bragg peak appears below 200 K, while no evidence of antiferromagnetic order was found in the oxygen-reduced superconducting one (Tc=25.5 K). These results imply that superconductivity concomitantly appears with the degradation of a magnetic ordering by oxygen-reduced procedure. Furthermore, we observed clear commensurate low-energy spin fluctuations, at the antiferromagnetic zone center in both as-grown and reduced samples, analogous to the result for Nd1.85Ce0.15CuO4. Therefore, commensurate spin fluctuations are robust against the electron-doping and is commonly exist in the electron-doped superconductors.
  Physica C Superconductivity · 1.01 Impact Factor