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Magnetic fluctuations in the magnetically ordering heavy-fermion compounds UCu5 and U2Zn17

Physical Review B, ISSN: 0163-1829, Vol: 36, Issue: 4, Page: 1981-1986
1987
  • 34
    Citations
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  • 4
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Metrics Details

  • Citations
    34
    • Citation Indexes
      34
  • Captures
    4

Article Description

We report on the first direct observation of magnetic fluctuations in magnetically ordering heavy-fermion U systems above TN. They were measured for UCu5 and U2Zn17 via the quasielastic lines by inelastic neutron scattering. Both compounds behave very similarly. We observe a common broad Lorentzian quasielastic line with width of order QE 10 meV, virtually unaffected by the magnetic phase transition, but also a narrow Gaussian quasielastic line, which we attribute to critical spin fluctuations. We discuss the occurrence of magnetic order in spite of the fast valence-fluctuation rate as in contrast to similar magnetically ordering 4f systems. © 1987 The American Physical Society.

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