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Mesoscopic magnetic states in metallic alloys with strong electronic correlations : a percolative scenario for CeNi/sub 1-x/Cu/sub x/

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  • معلومة اضافية
    • الموضوع:
      2007
    • Collection:
      Universidade Federal do Rio Grande do Sul (UFRGS): Lume
    • نبذة مختصرة :
      We present evidence for the existence of magnetic clusters of approximately 20 Å in the strongly correlated alloy system CeNi1-xCux (0.7 ≤ x ≤ 0.2) based on small angle neutron scattering experiments as well as the occurrence of staircaselike hysteresis cycles at very low temperature (100 mK). An unusual feature is the observation of long-range ferromagnetic order below the cluster-glass transition without any indication of a sharp transition at a Curie temperature. These observations strongly support a phenomenological model where a percolative process connects both magnetic states. The model can account for all the puzzling data previously obtained in this system, providing a new perspective with regard to the magnetic ground state of other alloyed compounds with small magnetic moments or weak ferromagnetism with intrinsic disorder effects.
    • File Description:
      application/pdf
    • ISSN:
      0031-9007
    • Relation:
      Physical review letters. Vol. 98, no. 16 (Apr. 2007), 166406 4p.; http://hdl.handle.net/10183/99400; 000595640
    • Rights:
      Open Access
    • الرقم المعرف:
      edsbas.9AD6277C