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Magnetism in electron-doped copper oxides
Authors:G. M. Luke  L. P. Le  B. J. Sternlieb  Y. J. Uemura  J. H. Brewer  R. Kadono  R. F. Kiefl  S. R. Kreitzman  T. M. Riseman  C. E. Stronach  M. Davis  S. Uchida  H. Takagi  Y. Tokura  Y. Hidaka  T. Murakami  E. A. Early  J. T. Markert  M. B. Maple  C. L. Seaman
Affiliation:(1) Columbia University, 538 West 120th St., 10027 New York, USA;(2) Dept. of Physics, Univ. of British Columbia, V6T 2A3 Vancouver, Canada;(3) Virginia State Univ., 23803 Petersburg, Virginia, USA;(4) Univ. of Tokyo, 113 Tokyo, Japan;(5) NTT Opto-Electronics Laboratories, 162 Tokai, 319-11 Ibaraki, Japan;(6) Univ. of California at San Diego, 92093 La Jolla, CA, USA;(7) Present address: Riken 2-1 Hirosawa, 351-01 Wako-shi, Saitima, Japan;(8) Present address: Dept. of Physics, Univ. of Texas, 78712 Austin, TX, USA
Abstract:
We report muon spin relaxation/rotation measurements on sintered powder samples of Nd2−x Ce x CuO4−y and a large single crystal of Nd2CuO4−y . We find an electronic phase diagram which is quite similar to that of hole-doped superconductors such as La2−x Sr x CuO4−y , although the doping of electrons into the system is less efficient in destroying the static moments on the copper spins. Static magnetic order in Nd2CuO4−y appears below about 250 K, and two spin reorientations are seen atT=75 K andT=35 K. Measurements of the magnetic field penetration depth have been unsuccessful due to the rare-earth paramagnetism of these materials.
Keywords:
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