Identification of the low-energy excitations in a quantum critical system | Zendy

Tom Heitmann | Zendy; Jagat Lamsal | Zendy; Shan Watson | Zendy; R. W. Erwin | Zendy; Wangchun Chen | Zendy; Yang Zhao | Zendy; Wouter Montfrooij | Zendy

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Identification of the low-energy excitations in a quantum critical system

Author(s) -

Tom Heitmann,

Jagat Lamsal,

Shan Watson,

R. W. Erwin,

Wangchun Chen,

Yang Zhao,

Wouter Montfrooij

Publication year - 2016

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.4972802

Subject(s) - physics , criticality , condensed matter physics , quantum , scaling , range (aeronautics) , scattering , spin (aerodynamics) , neutron scattering , atomic physics , quantum mechanics , materials science , nuclear physics , composite material , thermodynamics , geometry , mathematics

We have identified low-energy magnetic excitations in a doped quantum critical system by means of polarized neutron scattering experiments. The presence of these excitations could explain why Ce(Fe0.76Ru0.24)2Ge2 displays dynamical scaling in the absence of local critical behavior or long-range spin-density wave criticality. The low-energy excitations are associated with the reorientations of the superspins of fully ordered, isolated magnetic clusters that form spontaneously upon lowering the temperature. The system houses both frozen clusters and dynamic clusters, as predicted by Hoyos and Vojta [Phys. Rev. B 74, 140401(R) (2006)]

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