Further Analysis of the Quantum Critical Point of Ce1-x La x Ru2Si2

Raymond, Stéphane; Knafo, William; Flouquet, J.; Léjay, P.

doi:10.1007/s10909-007-9315-z

Cited by 9 publications

(11 citation statements)

References 55 publications

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“…Antiferromagnetic fluctuations at k 1 vanish at H m , while ferromagnetic fluctuations develop in a narrow window around H m [13,14,15] [ Figure 5(c)]. At zero-field, antiferromagnetic fluctuations with k 1 saturate below ≃ 10 K and their temperature scale is given by the linewidth Γ(k 1 ) = 10 K = T χ,max [11,47]. T χ,max and H m correspond thus to the energy scale of the antiferromagnetic fluctuations with the wavevector k 1 = (0.31, 0, 0) and the regime below T χ,max and H m is controlled by these intersite magnetic fluctuations.…”

Section: Methodsmentioning

confidence: 99%

Heavy fermions in a high magnetic field

Aoki

Knafo

Sheikin

2013

Comptes Rendus. Physique

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We give an overview on experimental studies performed in the last 25 years on heavy-fermion systems in high magnetic field. The properties of field-induced magnetic transitions in heavy-fermion materials close to a quantum antiferromagnetic-to-paramagnetic instability are presented. Effects of a high magnetic field to the Fermi surface, in particular the splitting of spin-up and spin-down bands, are also considered. Finally, we review on recent advances on the study of non-centrosymmetric compounds and ferromagnetic superconductors in a high magnetic field.To cite this article: D. Aoki, W. Knafo, and I. Sheikin, C. R. Physique XX (2012). RésuméFermions lourds en champ magnétique intense. Cette revue donne un aperçu desétudes expérimentales faites depuis 25 ans sur les systèmesà fermions lourds en champ magnétique intense. Les propriétés des transitions de phase magnétiques de composés proches d'une instabilité antiferromagnétique sont présentées. Les effets d'un champ magnétique intense sur la surface de Fermi, en particulier la séparation des bandes de spin "up" et "down", sont aussi considérées. Finalement, nous faisons le point sur les avancées récentes dans l'étude en champ magnétique intense de composés non-centrosymmétriques et de supraconducteurs ferromagnétiques.

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Section: Methodsmentioning

confidence: 99%

Heavy fermions in a high magnetic field

Aoki

Knafo

Sheikin

2013

Comptes Rendus. Physique

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“…11 is compatible with the expectation that antiferromagnetic fluctuations are less important in CeRh 2 Si 2 , which is ordered antiferromagnetically with a relatively high T N than in CeRu 2 Si 2 , which is a paramagnet close to an antiferromagnetic instability. CeRu 2 Si 2 , antiferromagnetic correlations were evidenced by inelastic neutron scattering up to a temperature T corr estimated between 50 K and 80 K 32,33 . This can be connected to the initial positive slope of the magnetoresistivity observed for T ≤ 50 K 34 .…”

Section: -5mentioning

confidence: 98%

High-field metamagnetism in the antiferromagnetCeRh2Si2

et al. 2010

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A study of the antiferromagnet CeRh2Si2 by torque, magnetostriction, and transport in pulsed magnetic fields up to 50 Tesla and by thermal expansion in static fields up to 13 Tesla is presented. The magnetic field-temperature phase diagram of CeRh2Si2, where the magnetic field is applied along the easy axis c, is deduced from these measurements. The second-order phase transition temperature TN and the first-order phase transition temperature T1,2 (= 36 K and 26 K at zero-field, respectively) decrease with increasing field. The field-induced antiferromagnetic-to-paramagnetic borderline Hc, which equals 26 T at 1.5 K, goes from first-order at low temperature to secondorder at high temperature. The magnetic field-temperature phase diagram is found to be composed of (at least) three different antiferromagnetic phases. These are separated by the first-order lines H1,2, corresponding to T1,2 at H = 0, and H2,3, which equals 25.5 T at 1.5 K. A maximum of the T 2 -coefficient A of the resistivity is observed at the onset of the high-field polarized regime, which is interpreted as the signature of an enhanced effective mass at the field-induced quantum instability. The magnetic field dependence of the A coefficient in CeRh2Si2 is compared with its pressure dependence, and also with the field dependence of A in the prototypal heavy-fermion system CeRu2Si2.

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“…Critical magnetic field, maximum of the magnetic susceptibility, and energy scale of the antiferromagnetic correlations in CeRu2Si2 and URu2Si2[8,[36][37][38][39]41,44,45]. T ≥ T0) = 50 K temperature scale T χ,max or T ρ,max determined here.…”

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confidence: 98%

Interplay of magnetism, Fermi surface reconstructions, and hidden order in the heavy-fermion material URu2Si2

et al. 2012

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URu2Si2 is surely one of the most mysterious of the heavy-fermion compounds. Despite more than twenty years of experimental and theoretical works, the order parameter of the transition at T0 = 17.5 K is still unknown. The state below T0 remains called "hidden-order phase" and the stakes are still to identify the energy scales driving the system to this phase. We present new magnetoresistivity and magnetization measurements performed on very-high-quality single crystals in pulsed magnetic fields up to 60 T. We show that the transition to the hidden-order state in URu2Si2 is initially driven by a high-temperature crossover at around 40-50 K, which is a fingerprint of intersite electronic correlations. In a magnetic field H applied along the easy-axis c, the vanishing of this high-temperature scale precedes the polarization of the magnetic moments, as well as it drives the destabilization of the hidden-order phase. Strongly impurity-dependent magnetoresistivity confirms that the Fermi surface is reconstructed below T0 and is strongly modified in a high magnetic field applied along c, i.e. at a sufficiently-high magnetic polarization. The possibility of a sharp crossover in the hidden-order state controlled by a field-induced change of the Fermi surface is pointed out.

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Further Analysis of the Quantum Critical Point of Ce1-x La x Ru2Si2

Cited by 9 publications

References 55 publications

Heavy fermions in a high magnetic field

Heavy fermions in a high magnetic field

High-field metamagnetism in the antiferromagnetCeRh2Si2

Interplay of magnetism, Fermi surface reconstructions, and hidden order in the heavy-fermion material URu2Si2

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