Fermi-liquid instabilities at magnetic quantum phase transitions

Löhneysen, H. v.; Rosch, Achim; Vojta, Matthias; Wölfle, P.

doi:10.1103/revmodphys.79.1015

Cited by 1,815 publications

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References 368 publications

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“…The MPD obtained show that the Cr 100−z Os z system exhibit possible QCB and that the CSDW-PM phase line terminates in a SC dome, similar to that previously observed in certain heavy fermion systems [15]. Although it was previously suggested for the (Cr 84 Re 16 ) 100−y V y system [5], this behaviour has now been confirmed for Cr 100−z Os z alloy system.…”

Section: Discussionsupporting

confidence: 48%

Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z

2017

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The magnetic phase diagrams of Cr alloys with group-8 metals, such as Re and Ru, show interesting properties. These include quantum critical and superconducting behavior. In order to extend these investigations this paper reports on the physical properties and the magnetic phase diagram of the Cr100−zOsz system, investigated in a concentration range of 2 ≤ z ≤ 30.6. Structural analysis indicate that samples with z < 22 have a bcc structure, while those with z > 22 include a cubic A15-type structure. Transport and magnetic property measurements indicate that the antiferromagnetic phase disappears at z ≈ 14 and that samples with concentrations z ≥ 12.2 show superconducting behavior. The magnetic phase diagram of Cr100−zOsz is constructed from the Néel and superconducting transition temperatures obtained from various measurements. The commensurate spin-densitywave to paramagnetic phase line decreases sharply for z > 4. Fitting parameters of a power law fit to the commensurate spin-density-wave to paramagnetic phase line indicate possible quantum critical behavior. Present results suggest that this phase line terminates in a superconducting dome near a magnetic quantum critical point, similar to that observed in certain heavy fermion systems, but not previously reported for other Cr alloys.

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Section: Discussionsupporting

confidence: 48%

Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z

2017

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“…6,20) A similar NFL behavior is also seen in the Ni substitutions. The exponent n of the T n function in ρ(T ), obtained by simply fitting the ρ(T ) data between 2.5 and 15 K, decreases to 0.65(5) at x = 0.125, but then recovers to 0.85(4) at x = 0.25 and 1.00(5) at x = 0.30 (2) [lower inset of Fig. 1(c)].…”

Section: Methodsmentioning

confidence: 99%

“…Various macroscopic quantities, such as specific heat, magnetic susceptibility, and electrical resistivity, in the vicinity of the AFM-QCP exhibit the non-Fermi-liquid (NFL) behavior originating from the strong enhancement of the AFM quantum critical fluctuations. [2][3][4] It is therefore expected that this fluctuation is tightly coupled with the Cooper pairing in these compounds.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅

et al. 2016

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The effect of off-plane impurity on superconductivity and non-Fermi-liquid (NFL) behavior in the layered heavyfermion compound CeCo 1−x Ni x In 5 is investigated by specific heat, magnetization, and electrical resistivity measurements. These measurements reveal that the superconducting (SC) transition temperature T c monotonically decreases from 2.3 K (x = 0) to 0.8 K (x = 0.20) with increasing x, and then the SC order disappears above x = 0.25. At the same time, the Ni substitution yields the NFL behavior at zero field for x = 0.25, characterized by the − ln T divergence in specific heat divided by temperature, C p /T , and magnetic susceptibility, M/B. The NFL behavior in magnetic fields for x = 0.25 is quite similar to that seen at around the SC upper critical field in pure CeCoIn 5 , suggesting that both compounds are governed by the same antiferromagnetic quantum criticality. The resemblance of the doping effect on the SC order among Ni-, Sn-, and Pt-substituted CeCoIn 5 supports the argument that the doped carriers are primarily responsible for the breakdown of the SC order. The present investigation further reveals the quantitative differences in the trends of the suppression of superconductivity between Ce(Co,Ni)In 5 and the other alloys, such as the rates of decrease in T c , dT c /dx, and specific heat jump at T c , d(∆C p /T c )/dx. We suggest that the occupied positions of the doped ions play an important role in the origin of these differences.

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“…Starting from the high-pressure phase, the change may look like a Mott transition, or breakdown of the Kondo effect [9]. More recent study [10], however, resolved two transitions; one is the Néel (SDW) transition, and the other occurs inside the magnetically ordered phase.…”

Section: Mott Vs Lifshitz Mechanisms For Change Of Fermi Surfacementioning

confidence: 99%

Summary of SCES2013: Theoretical Aspects

Kuramoto

2014

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2013)

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Brief overview is given on theoretical status of strongly correlated electron systems, referring especially to newer issues presented at SCES 2013. The highlights include: change of the Fermi surface caused by Mott and Lifshitz mechanisms, pairing symmetry of superconductivity, topologically nontrivial interacting electrons, peculiar antiferromagnetism in Kondo insulators, and non-Kramers systems including Pr 3+ and U 4+ . The topics are chosen by no means to be exhaustive, but by being under lively debate.

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Fermi-liquid instabilities at magnetic quantum phase transitions

Cited by 1,815 publications

References 368 publications

Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z

Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅

Summary of SCES2013: Theoretical Aspects

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Fermi-liquid instabilities at magnetic quantum phase transitions

Cited by 1,815 publications

References 368 publications

Superconductivity and Quantum Critical Behavior in Cr100-zOsz

Superconductivity and Quantum Critical Behavior in Cr100-zOsz

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo1−xNixIn5

Summary of SCES2013: Theoretical Aspects

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Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z

Superconductivity and Quantum Critical Behavior in Cr_100-zOs_z

Superconductivity and Non-Fermi-Liquid Behavior in the Heavy-Fermion Compound CeCo₁₋_xNi_xIn₅