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Avoided ferromagnetic quantum critical point: unusual short-range ordered state in CeFePO
S Lausberg1, J Spehling, A Steppke
1Max-Planck-Institute for Chemical Physics of Solids, D-01187 Dresden, Germany. lausberg@cpfs.mpg.de
Short-range static magnetism in CeFePO heavy-fermion systems prevents reaching a quantum critical point. Cooperative spin fluctuations suggest glassy dynamics, not typical spin glasses.
Area of Science:
- Condensed Matter Physics
- Quantum Materials Science
Background:
- Heavy-fermion systems like CeFePO exhibit complex electronic behaviors.
- Understanding spin dynamics is crucial for exploring quantum critical phenomena.
Purpose of the Study:
- Investigate the 4f electronic spin dynamics in CeFePO single crystals.
- Determine the nature of magnetic ordering and its impact on quantum criticality.
Main Methods:
- Utilized ac susceptibility measurements.
- Performed specific heat capacity analysis.
- Employed muon-spin relaxation (μSR) spectroscopy.
Main Results:
- Observed short-range static magnetism below T(g) ≈ 0.7 K.
- Identified strong, inhomogeneous spin fluctuations below 10 K via μSR.
- Demonstrated time-field scaling characteristic of glassy spin dynamics.
Conclusions:
- The observed magnetism impedes access to a ferromagnetic quantum critical point.
- Cooperative spin fluctuations indicate glassy dynamics, distinct from canonical spin glasses or disorder-driven mechanisms.
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