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Quantum critical behavior in Ce(Fe0.76Ru0.24)2Ge2.

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Magnetic materials with competing order and disorder show unique low-temperature properties. This study reveals these behaviors in Ce(Fe,Ru)2Ge2 stem from magnetic lattice fragmentation and cluster dynamics.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Magnetism

Background:

  • Systems with competing magnetic order and disorder exhibit unusual low-temperature phenomena.
  • Hyperscaling behavior in dynamic response is observed, where relaxation depends solely on the energy-to-temperature ratio (E/T).

Purpose of the Study:

  • To investigate the complex low-temperature behaviors in Ce(Fe0.755Ru0.245)2Ge2.
  • To elucidate the underlying mechanisms of magnetic lattice fragmentation and hyperscaling behavior.

Main Methods:

  • Analysis of two decades of neutron scattering and transport data.
  • New polarized and unpolarized neutron scattering experiments.

Main Results:

  • Observed unusual low-temperature behaviors in resistivity, susceptibility, and specific heat.
  • Identified magnetic lattice fragmentation due to a distribution of local Kondo screening temperatures.
  • Attributed hyperscaling behavior to the flipping of magnetic cluster moments.

Conclusions:

  • The complex behaviors in Ce(Fe0.755Ru0.245)2Ge2 arise from a fragmented magnetic lattice and spontaneous magnetic cluster formation.
  • Hyperscaling is linked to the dynamics of these magnetic clusters.