Physical properties of the Ce(<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ru</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Fe</mml:mi></mml:mrow><mml:mrow><mml:mi mat

Fontes, M. B.; Continentino, M. A.; Bud’ko, Sergey L.; ElMassalami, M.; Sampaio, Luiz C.; Guimarães, A.P.; Baggio‐Saitovitch, E.; Hundley, M. F.; Lacerda, A.

doi:10.1103/physrevb.53.11678

Cited by 32 publications

(22 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Also, the distances between the atoms of Ce-Ce, Ce-Ru, Ce-Ge are 0.42694, 0.32949, 0.32694 nm, respectively. 13) Therefore the atom radius of Ce, Ru, Ge are 0.21347, 0.11602, 0.11347 nm, respectively.…”

Section: Methodsmentioning

confidence: 97%

140Ce (←140La) Time-Differential Perturbed Angular Correlation Study of CeRu2Ge2

et al. 2002

View full text Add to dashboard Cite

Section: Methodsmentioning

confidence: 97%

140Ce (←140La) Time-Differential Perturbed Angular Correlation Study of CeRu2Ge2

et al. 2002

View full text Add to dashboard Cite

“…The same isovalent substitution that provides chemical pressure in Ce͑Ru 0. 24 Fe 0.76 ͒ 2 Ge 2 also introduces local changes in the interatomic distances on the order of 0.05 Å. Though small, these changes are sufficient to affect the orbital overlap between adjacent atoms such that a distribution of Kondo shielding temperatures is effectively introduced.…”

Section: Introductionmentioning

confidence: 99%

“…18 Starting from the heavy-fermion system CeFe 2 Ge 2 , 23 upon increased doping x of Ru on the Fe sites Ce͑Ru 0.24 Fe 0.76 ͒ 2 Ge 2 orders magnetically at 0 K once 1:4 Fe ions have been substituted. 15,24 This isovalent substitution takes place on sites that are not nearest neighbors to the moment carrying Ce sites. Thus, one could have expected the effects of this chemical doping to be uniformly spread out over the crystal lattice.…”

Section: Introductionmentioning

confidence: 99%

Magnetic excitations in the spinel compoundLix[Mn1.96Li0.04]
Heitmann
¹
,
Schmets
²
,
Gaddy
³

et al. 2010
Phys. Rev. B
9
0
4
0
View full text Add to dashboard Cite

We present neutron-scattering results on the magnetic excitations in the spinel compounds Li x ͓Mn 1.96 Li 0.04 ͔O 4 ͑x = 0.2, 0.6, 0.8, 1.0͒. We show that the dominant excitations below T ϳ 70 K are determined by Mn ions located in clusters, and that these excitations mimic the dynamic scaling found in quantum critical systems that also harbor magnetic clusters, such as CeRu 0.5 Fe 1.5 Ge 2 . We argue that our results for this classical spinel compound suggest that the unusual response at low temperatures as observed in quantum critical systems that have been driven to criticality through substantial chemical doping is ͑at least͒ partially the result of the fragmentation of the magnetic lattice into smaller units.

show abstract

“…Unfortunately, there is a potential disconnect between the real systems that are being studied experimentally, and the idealized systems that theoretical scenarios are based upon. Here we discuss how disorder introduces a change in morphology from a three-dimensional system to a collection of magnetic clusters, and we present neutron scattering data on a classical system, Li͓Mn 1.96 Li 0.04 ͔O 4 , that show how magnetic clusters by themselves can lead to scaling laws that mimic those observed in quantum critical systems. © 2009 American Institute of Physics.…”

mentioning

confidence: 99%

The search for quantum critical scaling in a classical system

Lamsal

Gaddy

Petrovic

et al. 2009

Journal of Applied Physics

View full text Add to dashboard Cite

Order-disorder phase transitions in magnetic metals that occur at zero temperature have been studied in great detail. Theorists have advanced scenarios for these quantum critical systems in which the unusual response can be seen to evolve from a competition between ordering and disordering tendencies, driven by quantum fluctuations. Unfortunately, there is a potential disconnect between the real systems that are being studied experimentally, and the idealized systems that theoretical scenarios are based upon. Here we discuss how disorder introduces a change in morphology from a three-dimensional system to a collection of magnetic clusters, and we present neutron scattering data on a classical system, Li͓Mn Quantum fluctuations can be strong enough to prevent a system from ordering, even at 0 K. In metals that possess atomic magnetic moments, one can tweak the strength of the magnetic interactions compared to the disordering quantum fluctuations in such a way that the system orders exactly at 0 K. Such a system is said to be at the quantum critical point ͑QCP͒. The interest in such systems is easy to understand. One can expect a new type of ordering behavior because the spatial and temporal dimensions are no longer independent at 0 K.1 Also, one can expect new physics to emerge. After all, when a system is on the verge of ordering at 0 K, the degrees of freedom that prevent the system from ordering also provide a channel for the system to adopt a new, lower energy ground state. An example is the observed superconducting state 1 that forms close to the QCP with quasiparticles consisting of some admixture of magnetic moments and conduction electrons.The question that has attracted most attention is "what exactly happens at the QCP?" On the one hand, 2 it could be that all moments will become fully shielded at some finite temperature, with the residual interaction between the resulting heavy quasiparticles driving the system toward ordering ͓Fig. 1͑a͔͒. On the other hand, 2 the QCP could be the point in the phase diagram where vestiges of moments can survive all the way down to 0 K upon cooling without being completely screened though the Kondo effect, resulting in long-range order ͓Fig. 1͑b͔͒. Unfortunately, the experimental situation is much murkier than a simple choice between these two possible answers.To drive a system to a QCP, one tweaks the interaction between moments by changing the degree of overlap between the local atomic orbitals and the extended conduction electron bands. Ideally, one simply applies hydrostatic pressure to a system without any intrinsic disorder, and all magnetic moments will undergo the same temperature evolution. This is the situation that most theoretical efforts have focused on ͓Ref. 1͔. In some experiments however, one cannot attain the high pressures required and one results to applying chemical pressure. Here, some elements are substituted with different sized ones so as to achieve lattice expansion/ contraction at the cost of introducing some disorder. However, it was generally...

show abstract

Physical properties of the Ce(Ru1−xFe

Cited by 32 publications

References 27 publications

<SUP>140</SUP>Ce (←<SUP>140</SUP>La) Time-Differential Perturbed Angular Correlation Study of CeRu<SUB>2</SUB>Ge<SUB>2</SUB>

<SUP>140</SUP>Ce (←<SUP>140</SUP>La) Time-Differential Perturbed Angular Correlation Study of CeRu<SUB>2</SUB>Ge<SUB>2</SUB>

Magnetic excitations in the spinel compoundLix[Mn1.96Li0.04]
Heitmann
¹
,
Schmets
²
,
Gaddy
³

et al. 2010
Phys. Rev. B
9
0
4
0
View full text Add to dashboard Cite

The search for quantum critical scaling in a classical system

Contact Info

Product

Resources

About

Physical properties of the Ce(Ru1−xFe

Cited by 32 publications

References 27 publications

<SUP>140</SUP>Ce (&larr;<SUP>140</SUP>La) Time-Differential Perturbed Angular Correlation Study of CeRu<SUB>2</SUB>Ge<SUB>2</SUB>

<SUP>140</SUP>Ce (&larr;<SUP>140</SUP>La) Time-Differential Perturbed Angular Correlation Study of CeRu<SUB>2</SUB>Ge<SUB>2</SUB>

Magnetic excitations in the spinel compoundLix[Mn1.96Li0.04]Heitmann1, Schmets2, Gaddy3 et al. 2010Phys. Rev. B9040View full textAdd to dashboardCite

The search for quantum critical scaling in a classical system

Contact Info

Product

Resources

About

<SUP>140</SUP>Ce (←<SUP>140</SUP>La) Time-Differential Perturbed Angular Correlation Study of CeRu<SUB>2</SUB>Ge<SUB>2</SUB>

<SUP>140</SUP>Ce (←<SUP>140</SUP>La) Time-Differential Perturbed Angular Correlation Study of CeRu<SUB>2</SUB>Ge<SUB>2</SUB>

Magnetic excitations in the spinel compoundLix[Mn1.96Li0.04]
Heitmann
¹
,
Schmets
²
,
Gaddy
³

et al. 2010
Phys. Rev. B
9
0
4
0
View full text Add to dashboard Cite