Novel Spin Excitations in Optimally Electron-Doped Pr_<0.89>LaCe_<0.11>CuO_4

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Abstract

To study the detailed structure of the magnetic excitation spectrum, we performed a neutron scattering experiment on optimally electron-doped Pr<SUB>0.89</SUB>LaCe<SUB>0.11</SUB>CuO4 (<I>T</I><SUB>c</SUB>=25.5 K). Well-defined spin excitations existed up to an energy of ω∼180 meV, which is consistent with the recent observation by Wilson <I>et al.</I> [Phys. Rev. Lett. <B>96</B> (2006) 157001] for the same cuprate with a different <I>T</I><SUB>c</SUB>. Better statistics in our experiment revealed a more precise structure of the spectrum. As the energy increased up to ω<SUB>c</SUB>∼60 meV, the peak width (κ) markably increased, but in the high-energy region beyond ω<SUB>c</SUB> the width remained nearly independent of the energy. χ<SUP>′′</SUP>(ω) showed a sharp peak at ω=6 meV, which markably diminished as the energy increased until eventually a well-defined magnetic signal was not observed near ω<SUB>c</SUB>. However, a broad magnetic peak at (π,π) reappeared beyond ω∼100 meV. We discuss the nature of the spin excitation spectrum, which is vastly different from that of a conventional spin wave excitation with localized spins.

Journal

  • Journal of the Physical Society of Japan

    Journal of the Physical Society of Japan 75(9), "93704-1"-"93704-4", 2006-09-15

    The Physical Society of Japan (JPS)

References:  19

Codes

  • NII Article ID (NAID)
    110004789063
  • NII NACSIS-CAT ID (NCID)
    AA00704814
  • Text Lang
    ENG
  • Article Type
    SHO
  • ISSN
    00319015
  • NDL Article ID
    8055205
  • NDL Source Classification
    ZM35(科学技術--物理学)
  • NDL Call No.
    Z53-A404
  • Data Source
    CJP  NDL  NII-ELS  J-STAGE 
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