A Drastic Change of the Fermi Surface at a Critical Pressure in CeRhIn<sub>5</sub>: dHvA Study under Pressure

Shishido, Hiroaki; Settai, Rikio; Harima, Hisatomo; Ōnuki, Yoshichika

doi:10.1143/jpsj.74.1103

Cited by 393 publications

(497 citation statements)

References 15 publications

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“…The logarithmic field divergence of the T = 0 Sommerfeld coefficient γ(B, T) = C M (B, T)/T (Fig. 4B, Inset) implies a weaker divergence of the quasi-particle mass at the QCP than the power law divergencies that are generally found in other QC systems (29,30). However, the field divergence of the Pauli susceptibility (Fig.…”

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confidence: 86%

Quantum critical fluctuations in layered YFe ₂ Al ₁₀

Kim

Park

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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The absence of thermal fluctuations at T = 0 makes it possible to observe the inherently quantum mechanical nature of systems where the competition among correlations leads to different types of collective ground states. Our high precision measurements of the magnetic susceptibility, specific heat, and electrical resistivity in the layered compound YFe 2 Al 10 demonstrate robust field-temperature scaling, evidence that this system is naturally poised without tuning on the verge of ferromagnetic order that occurs exactly at T = 0, where magnetic fields drive the system away from this quantum critical point and restore normal metallic behavior.quantum criticality | ferromagnet | dynamical scaling T he interplay of competing interactions is responsible for the array of ground states that are possible in correlated electron systems. It is of particular importance to understand how one such ground state gives way to another when the system is tuned at temperature T = 0, without the complications of thermal fluctuations. Consequently, much interest has focused on quantum critical points (QCPs), where an ordered phase can be created by an infinitesimal modifications of pressure, composition, or field. The onset of ferromagnetic order is perhaps the simplest T = 0 phase transition, and indeed much experimental and theoretical effort has been directed toward understanding its essential features (1-6). It is generally believed that ferromagnetic order occurs at T = 0 via a discontinuous or first order transition, as is observed in the clean ferromagnets ZrZn 2 (7) and MnSi (8) under pressure. Disorder is known to render the ferromagnetic transition continuous, leading to the mean field behavior that is found when doping drives T C = 0 in Ni 1−x Pd x (9), Zr 1−x Nb x Zn 2 (10), and Nb 1−y Fe 2+y (11). More controversial is the possibility that strong quantum fluctuations, such as those that destabilize order in low-dimensional systems, may be significant near the T C = 0 ferromagnetic transition and perhaps may even destroy its first-order character (5). A complete experimental investigation of the critical phenomena and their scaling behaviors in a carefully selected system where disorder is minimal is needed to establish that quantum critical fluctuations are both present and relevant to the destabilization of ferromagnetic order.Progress toward obtaining this information has been painstaking, although a number of systems have been identified where the Curie temperature T C has been driven to zero. High pressure experiments evade the disorder that necessarily accompanies doping, but thus far only resistivity and susceptibility measurements have been reported. Complete experimental access is possible when doping is used to suppress T C → 0, but even small amounts of compositional inhomogeneity can obscure any intrinsic critical fluctuations of T C = 0 ferromagnetic transitions, resulting in interesting complications such as the Griffiths phase (12,13,14), as well as short ranged order, including spin glasses (15). Alterna...

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confidence: 86%

Quantum critical fluctuations in layered YFe ₂ Al ₁₀

Kim

Park

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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“…The main result of this paper is the evidence for a switching of incommensurate magnetic order with k IC =(1/2, 1/2, k l ) (0.298 ≤ k l ≤ 0.410) to commensurate magnetic order with k C =(1/2, 1/2, 0) (so-called C-type magnetic structure) in CeRhIn 5−x Sn x above x=0. 26. Figure 3 shows the temperature dependence of a Qscan performed along [0,0,1] for x=0.20.…”

Section: Pacs Numbersmentioning

confidence: 99%

“…The propagation vector of the magnetic structure is found to be kIC=(1/2, 1/2, k l ) with k l increasing from k l =0.298 to k l =0.410 when x increases from x=0 to x=0. 26. Surprisingly, for x=0.30, the order has changed drastically and a commensurate antiferromagnetism with kC=(1/2, 1/2, 0) is found.…”

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confidence: 94%

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

et al. 2014

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We report neutron diffraction experiments performed in the tetragonal antiferromagnetic heavy fermion system CeRhIn5−xSnx in its (x, T ) phase diagram up to the vicinity of the critical concentration xc ≈ 0.40, where long range magnetic order is suppressed. The propagation vector of the magnetic structure is found to be kIC=(1/2, 1/2, k l ) with k l increasing from k l =0.298 to k l =0.410 when x increases from x=0 to x=0.26. Surprisingly, for x=0.30, the order has changed drastically and a commensurate antiferromagnetism with kC=(1/2, 1/2, 0) is found. This concentration is located in the proximity of the quantum critical point where superconductivity is expected.

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“…In early study of CeRhIn 5 and related 115 compounds [8], applied pressure led to a change of the Fermi surface, which looked like a transition from localized to itinerant behavior of f electrons. Starting from the high-pressure phase, the change may look like a Mott transition, or breakdown of the Kondo effect [9].…”

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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A Drastic Change of the Fermi Surface at a Critical Pressure in CeRhIn₅: dHvA Study under Pressure

Cited by 393 publications

References 15 publications

Quantum critical fluctuations in layered YFe ₂ Al ₁₀

Quantum critical fluctuations in layered YFe ₂ Al ₁₀

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

Summary of SCES2013: Theoretical Aspects

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A Drastic Change of the Fermi Surface at a Critical Pressure in CeRhIn5: dHvA Study under Pressure

Cited by 393 publications

References 15 publications

Quantum critical fluctuations in layered YFe 2 Al 10

Quantum critical fluctuations in layered YFe 2 Al 10

Switching of the magnetic order inCeRhIn5−xSnxin the vicinity of its quantum critical point

Summary of SCES2013: Theoretical Aspects

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Product

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A Drastic Change of the Fermi Surface at a Critical Pressure in CeRhIn₅: dHvA Study under Pressure

Quantum critical fluctuations in layered YFe ₂ Al ₁₀

Quantum critical fluctuations in layered YFe ₂ Al ₁₀