Magnetic excitations in the spinel compound<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mi>x</mml:mi></mml:msub><mml:mrow><mml:mo>[</mml:mo><mml:mrow><mml:msub><mml:mrow><mml:mtext>Mn</mml:mtext></mml:mrow><mml:mrow><mml:mn>1.96</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mtext>Li</mml:mtext></mml:mrow><mml:mrow><mml:mn>0.04</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>]</mml:mo></mml:mrow><mm

Heitmann, Thomas; Schmets, A.J.M.; Gaddy, John; Lamsal, Jagat; Petrovic, Marcus; Vojta, Thomas; Montfrooij, Wouter

doi:10.1103/physrevb.81.014411

Cited by 9 publications

(4 citation statements)

References 39 publications

(98 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This is based on the observed presence [16] of E/T-scaling, something that can only happen if low energy degrees of freedom are present and on the fact that our neutron scattering investigation has not found any other low energy degrees of freedom. We note that even in a classical system E/T-scaling has been observed [43] as a result of the presence of magnetic clusters. Lastly, we find no evidence for the moments within clusters being shielded upon further cooling, and therefore, we conclude that isolated clusters are protected from Kondo shielding.…”

Section: Cluster Dynamicsmentioning

confidence: 76%

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

et al. 2019

Self Cite

View full text Add to dashboard Cite

Systems with embedded magnetic ions that exhibit a competition between magnetic order and disorder down to absolute zero can display unusual low temperature behaviors of the resistivity, susceptibility, and specific heat. Moreover, the dynamic response of such a system can display hyperscaling behavior in which the relaxation back to equilibrium when an amount of energy E is given to the system at temperature T only depends on the ratio E/T. Ce(Fe 0.755 Ru 0.245) 2 Ge 2 is a system that displays these behaviors. We show that these complex behaviors are rooted in a fragmentation of the magnetic lattice upon cooling caused by a distribution of local Kondo screening temperatures, and that the hyperscaling behavior can be attributed to the flipping of the total magnetic moment of magnetic clusters that spontaneously form and order upon cooling. We present our arguments based on the review of two-decades worth of neutron scattering and transport data on this system, augmented with new polarized and un-polarized neutron scattering experiments.

show abstract

Section: Cluster Dynamicsmentioning

confidence: 76%

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

et al. 2019

Self Cite

View full text Add to dashboard Cite

show abstract

“…This is based on the observed presence [16] of E/T-scaling, something which can only happen if low energy degrees of freedom are present and on the fact that our neutron scattering investigation has not found any other low energy degrees of freedom. We note that even in a classical system E/T-scaling has been observed [40] as a result of the presence of magnetic clusters. Lastly, we find no evidence for the moments within clusters being shielded upon further cooling, and therefore, we conclude that isolated clusters are protected from Kondo shielding.…”

Section: Cluster Dynamicsmentioning

confidence: 76%

Quantum critical behavior in Ce(Fe$_{0.76}$Ru$_{0.24}$)$_2$Ge$_2$: the full story

Montfrooij,

Heitmann,

Qiu

et al. 2018

Preprint

Self Cite

View full text Add to dashboard Cite

Systems with embedded magnetic ions that exhibit a competition between magnetic order and disorder down to absolute zero can display unusual low temperature behaviors of the resistivity, susceptibility, and specific heat. Moreover, the dynamic response of such a system can display hyperscaling behavior in which the relaxation back to equilibrium when an amount of energy E is given to the system at temperature T only depends on the ratio E/T. Ce(Fe 0.755 Ru 0.245 ) 2 Ge 2 is a system that displays these behaviors. We show that these complex behaviors are rooted in a fragmentation of the magnetic lattice upon cooling caused by a distribution of local Kondo screening temperatures, and that the hyperscaling behavior can be attributed to the flipping of the total magnetic moment of magnetic clusters that spontaneously form and order upon cooling.We present our arguments based on the review of two-decades worth of neutron scattering and transport data on this system, augmented with new polarized neutron scattering experiments.

show abstract

“…When the energy required to reorient a cluster is very small compared to the thermal energy, then we can expect to see the equivalent of high-energy physics as the probing energies and thermal energies in a typical experiment greatly exceed the cost of the lowest energy excitations. In experiments, this would be visible as E/T scaling [30,49,50]. Given this reorientation possibility, we could interpret the field of H = 0.02 mT identified in Fig.…”

Section: Discussionmentioning

confidence: 87%

Evidence for magnetic clusters in stoichiometric quantum critical CeRu$_2$Si$_2$

Bretaña,

Fayfar,

Montfrooij

2021

Preprint

Self Cite

View full text Add to dashboard Cite

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 CeRu2Si2, 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(Ru0.755Fe0.245)2Ge2, 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.

show abstract

Magnetic excitations in the spinel compoundLix[Mn1.96Li0.04]

Cited by 9 publications

References 39 publications

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

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

Quantum critical behavior in Ce(Fe$_{0.76}$Ru$_{0.24}$)$_2$Ge$_2$: the full story

Evidence for magnetic clusters in stoichiometric quantum critical CeRu$_2$Si$_2$

Contact Info

Product

Resources

About