Effects of volume and electronic concentration on 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">Pd</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="italic">M</mml:mi></mml:

Jg, Sereni; Beaurepaire, E.; Jp, Kappler

doi:10.1103/physrevb.48.3747

Cited by 36 publications

(20 citation statements)

References 15 publications

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“…0 ഛ x ഛ x * ͒, the T C ͑x͒ phase boundary ͑6 Kജ T C ͑x͒ Ͼ 2 K͒ points to the early critical concentration proposed at x Ϸ 0.65. 17 Beyond x * ͑i.e., below about 2 K͒, another type of criticality dominates the scenario according to the drastic changes in the low-temperature properties. The question arises whether this threshold is governed by concentration ͑i.e., chemical potential͒ or by the exhausting thermal fluctuations overcome by quantum fluctuations.…”

Section: Discussionmentioning

confidence: 97%

“…This system evolves from a F-Ce 3+ state with T C = 6.6 K to a nonmagnetic MV, with susceptibility ͑ dc ͒ and electrical resistivity ͑͒ maxima at T Ϸ 280 K. 16 Its cell volume decreases continuously with x, showing a deviation from Vegard's law around x V = 0.75, while L III x-ray absorption spectroscopy ͑XAS͒ measurements 16 indicate a significant decrease of the 4f state occupancy beyond that concentration. Early studies 17 have extrapolated T C ͑x͒ → 0 from T Ͼ 3 K at x Ϸ 0.65. However, recent investigations performed at lower temperature revealed that T C ͑x͒ does not tend to zero at the previously reported value because its negative curvature changes to slightly positive at x * Ϸ 0.63.…”

Section: Introductionmentioning

confidence: 99%

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Ferromagnetic quantum criticality in the alloyCePd1−xRhx

et al. 2007

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The CePd 1−x Rh x alloy exhibits a continuous evolution from ferromagnetism ͑T C = 6.5 K͒ at x = 0 to a mixedvalence ͑MV͒ state at x = 1. We have performed a detailed investigation on the suppression of the ferromagnetic ͑F͒ phase in this alloy using dc ͑ dc ͒ and ac ͑ ac ͒ susceptibility, specific heat ͑C m ͒, resistivity ͑͒, and thermal expansion ͑␤͒ techniques. Our results show a continuous decrease of T C ͑x͒ with negative curvature down to T C =3 K at x * = 0.65, where a positive curvature takes over. Beyond x * , a cusp in ac is traced down to T C * =25 mK at x = 0.87, locating the critical concentration between x = 0.87 and 0.90. The quantum criticality of this region is recognized by the −log͑T / T 0 ͒ dependence of C m / T, which transforms into a T −q ͑q Ϸ 0.5͒ one at x = 0.87. At high temperature, this system shows the onset of valence instability revealed by a deviation from Vegard's law ͑at x V Ϸ 0.75͒ and increasing hybridization effects on high-temperature dc and ͑T͒. Coincidentally, a Fermi liquid contribution to the specific heat ͑␥͒ arises from the MV component, which becomes dominant at the CeRh limit. In contrast to antiferromagnetic systems, no C m / T flattening is observed for x Ͼ x cr but, rather, the mentioned power-law divergence, which coincides with a change of sign of ␤͑T͒. The coexistence of F and MV components and the sudden changes in the T dependencies are discussed in the context of randomly distributed magnetic and Kondo couplings.

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Section: Discussionmentioning

confidence: 97%

Section: Introductionmentioning

confidence: 99%

Ferromagnetic quantum criticality in the alloyCePd1−xRhx

et al. 2007

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“…19͒ or CeM x Pd 1Ϫx ͑with M ϭ Ni or Rh͒. 20,21 In conclusion, the variation of the Néel temperature which is predicted by the Doniach diagram is well followed in many cerium Kondo compounds. However, the preceding description appears to be too much simplified for the real Kondo temperature T K which is experimentally observed in such cerium compounds.…”

Section: State Of the Problem: The Experimental Situationmentioning

confidence: 93%

Revisited Doniach diagram: Influence of short-range antiferromagnetic correlations in the Kondo lattice

1997

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The Kondo lattice model including nearest-neighbor magnetic exchange interactions is studied here in a mean-field approximation describing both the Kondo state and the intersite magnetic correlations. In the case of antiferromagnetic correlations, our model yields a decrease of the Kondo temperature compared to the one-impurity value, giving, therefore, a ''revisited'' version of the Doniach diagram with a rather flat Kondo temperature in the nonmagnetic case, as observed in several cerium compounds. Our model shows also that short-range magnetic correlations can appear at a temperature clearly larger than the Kondo temperature, as observed in compounds such as CeCu 6 or CeRu 2 Si 2 . ͓S0163-1829͑97͒04642-0͔

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“…CePd1−xRhx This series crystallizes in the orthorhombic CrB structure and evolves from a FM ground state in CePd with T C = 6.6 K to a non-magnetic intermediate-valence state in CeRh Sereni et al, 1993). The chemical substitution of the Ce-ligand Pd with Rh induces not just a volume effect (positive chemical pressure), but also increases the local 18 We do not include diluted magnetic semiconductors, such as Fe 1−x CoxS 2 .…”

Section: Systems With Glass-like Featuresmentioning

confidence: 99%

Metallic quantum ferromagnets

et al. 2016

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We give an overview of quantum phase transitions (QPTs) in metallic ferromagnets, discussing both experimental and theoretical aspects. These QPTs can be classified with respect to the presence and strength of quenched disorder: Clean systems generically show a discontinuous, or first-order, QPT from a ferromagnetic to a paramagnetic state as a function of some control parameter, as predicted by theory. Disordered systems are much more complicated, depending on the disorder strength and the distance from the QPT. In many disordered materials the QPT is continuous, or second order, and Griffiths-phase effects coexist with QPT singularities near the transition. In other systems the transition from the ferromagnetic state at low temperatures is to a different type of long-range order, such as an antiferromagnetic or a spin-density-wave state. In still other materials a transition to a state with glass-like spin dynamics is suspected. The review provides a comprehensive discussion of the current understanding of these various transitions, and of the relation between experiment and theory.

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Effects of volume and electronic concentration on the Ce(Pd1−xM

Cited by 36 publications

References 15 publications

Ferromagnetic quantum criticality in the alloyCePd1−xRhx

Ferromagnetic quantum criticality in the alloyCePd1−xRhx

Revisited Doniach diagram: Influence of short-range antiferromagnetic correlations in the Kondo lattice

Metallic quantum ferromagnets

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