Evidence for magnetic clusters in stoichiometric quantum critical CeRuSi
arXiv:2104.03941 · doi:10.1103/PhysRevB.104.085135
Abstract
Systems that have been prepared to undergo a second-order phase transition at zero Kelvin, the so-called quantum critical systems, appear to fall into two categories: (chemically) heavily-doped systems where the unusual properties can be related to a disorder-induced distribution of Kondo shielding temperatures, and (almost) stoichiometric systems where the departures from Fermi-liquid theory have been attributed to intrinsic instabilities. Here we show that this distinction is not as clear cut and that magnetic clusters associated with a distribution of Kondo shielding temperatures are also present in CeRuSi, a system close to a quantum critical point. By revisiting published data on this system and comparing them to the results for heavily-doped quantum critical Ce(RuFe)Ge, we show that clusters exist in both systems at low temperatures, and that the moments of the Ce-ions within these clusters have all lined up with their neighbors. This implies that the dominant physics that drives heavily-doped systems, namely spontaneous formation of magnetic clusters, should also play a leading role in the response of homogenous systems. This represents a notable departure of how the physics that governs quantum critical points is treated in the literature.
arXiv comment17 pages, 9 figures, submitted to PRB
References in corpus (13)
- Locally critical quantum phase transitions in strongly correlated metals
- Onset of antiferromagnetism in heavy fermion metals
- Non-Fermi Liquid Behavior in U and Ce Alloys: Criticality, Disorder, Dissipation, and Griffiths-McCoy singularities
- Kondo disorder: a possible route towards non-Fermi liquid behavior
- Ac Susceptibility and Static Magnetization Measurements of CeRuSi at Small Magnetic Fields and Ultra Low Temperatures
- Quantum Critical Point of Itinerant Antiferromagnet in Heavy Fermion
- Spin Fluctuation in Heavy Fermion CeRu_2Si_2
- Percolation transition and dissipation in quantum Ising magnets
- Anomalous temperature-dependent transport in YbNi2B2C and its correlation to microstructural features
- Protected percolation: a new universality class pertaining to heavily-doped quantum critical systems
- Magnetic excitations in the spinel compound Li[MnLi]O (x= 0.2, 0.6, 0.8, 1.0): how a classical system can mimic quantum critical scaling
- Quantum critical behavior in Ce(FeRu)Ge: the full story
- Cluster formation in quantum critical systems