Fermi surface instability in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">CeRh</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>under pressure

Araki, Shingo; Settai, Rikio; Kobayashi, Tatsuo; Harima, Hisatomo; Ōnuki, Yoshichika

doi:10.1103/physrevb.64.224417

Cited by 71 publications

(79 citation statements)

References 21 publications

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“…A key problem is the FS evolution first at P=0 in the polarized paramagnetic state (PPM) state created above the metamagnetic field (H c ∼23T) and then inside this PPM state under pressure, notably for P > P c [37]. By comparison to YbRh 2 Si 2 where similar questions are under debate, CeRh 2 Si 2 is a quite more realistic experimental case since FS determinations have already been achieved inside the AF and PM phases at low field [25]. Unfortunately, this situation is unlikely to happen in YbRh 2 Si 2 due to the hudge value of the effective masses and the low value of the magnetic critical field (H ≃ 0.1T ) [27,38,39].…”

Section: Discussionmentioning

confidence: 99%

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Collapse of antiferromagnetism in CeRh₂Si₂: volume versus entropy

Villaume¹,

Aoki²,

Haga³

et al. 2007

J. Phys.: Condens. Matter

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Abstract. The thermal expansion of the heavy fermion compound CeRh 2 Si 2 has been measured under pressure as a function of temperature using strain gages. A large anomaly associated to the Néel temperature has been detected even above the suspected critical pressure P c ∼ 1.05 GPa where no indication of antiferromagnetism has been observed in calorimetry experiments sensitive to the entropy change. An unexpected feature is the pressure slowdown of the antiferromagnetic-paramagnetic transition by comparison to the fast pressure collapse predicted for homogeneous first order quantum phase transition with one unique pressure singularity at P c . A large pressure dependance is observed in the anisotropy of the thermal expansion measured parallel or perpendicular to the c axis of this tetragonal crystal. The Fermi surface reconstruction associated to the first order transition produces quite different pressure response in the transport scattering measured along different crystallographic directions. A brief discussion is made on other examples of first order quantum transitions in strongly correlated electronic systems : MnSi and CeCoIn 5 .

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Section: Discussionmentioning

confidence: 99%

“…The FS reconstruction switches from a FS analog to LaRh 2 Si 2 with a localized behavior of the 4f electron (P < P c ) to, in the PM phase (P > P c ), a FS where the 4f electrons are considered to be itinerant [25].…”

Section: Discussionmentioning

confidence: 99%

Collapse of antiferromagnetism in CeRh₂Si₂: volume versus entropy

Villaume¹,

Aoki²,

Haga³

et al. 2007

J. Phys.: Condens. Matter

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show abstract

“…11(b). According to [49], at least one sheet of the Fermi surface of CeRh 2 Si 2 crosses the degeneracy surface or comes close to it.…”

Section: Cepd2si2 and Cerh2si2mentioning

confidence: 99%

Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors

Ramazashvili

2009

Phys. Rev. B

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In this article, I analyze the symmetries and degeneracies of electron eigenstates in a commensurate collinear antiferromagnet. In a magnetic field transverse to the staggered magnetization, a hidden anti-unitary symmetry protects double degeneracy of the Bloch eigenstates at a special set of momenta. In addition to this 'Kramers degeneracy' subset, the manifold of momenta, labeling the doubly degenerate Bloch states in the Brillouin zone, may also contain an 'accidental degeneracy' subset, that is not protected by symmetry and that may change its shape under perturbation. These degeneracies give rise to a substantial momentum dependence of the transverse g-factor in the Zeeman coupling, turning the latter into a spin-orbit interaction.I discuss a number of materials, where Zeeman spin-orbit coupling is likely to be present, and outline the simplest properties and experimental consequences of this interaction, that may be relevant to systems from chromium to borocarbides, cuprates, hexaborides, iron pnictides, as well as organic and heavy fermion conductors.

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“…Up to now, the CeRu 2 Si 2 series is the fingerprint example of these phenomena 2,3 . Here we present the effects of H an P on the thermoelectric power (TEP) of the compound CeRh 2 Si 2 with the aim to observe the response on a system where a FS instability under pressure is well established by previous de Haas van Alphen (dHvA) experiments [4][5][6] and where the magnetic structure of the AF phase has been fully determined 7 . Figure 1 represents the main features of the CeRh 2 Si 2 (H, T , P ) phase diagram as measured from our TEP.…”

Section: Introductionmentioning

confidence: 99%

Fermi surface instabilities inCeRh2Si2at high magnetic field and pressure

et al. 2015

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We present thermoelectric power (TEP) studies under pressure and high magnetic field in the antiferromagnet CeRh2Si2 at low temperature. Under magnetic field, large quantum oscillations are observed in the TEP, S(H), in the antiferromagnetic phase. They suddenly disappear when entering in the polarized paramagnetic (PPM) state at Hc pointing out an important reconstruction of the Fermi surface (FS). Under pressure, S/T increases strongly of at low temperature near the critical pressure Pc, where the AF order is suppressed, implying the interplay of a FS change and low energy excitations driven by spin and valence fluctuations. The difference between the TEP signal in the PPM state above Hc and in the paramagnetic state (PM) above Pc can be explained by different FS. Band structure calculations at P = 0 stress that in the AF phase the 4f contribution at the Fermi level (EF ) is weak while it is the main contribution in the PM domain. By analogy to previous work on CeRu2Si2, in the PPM phase of CeRh2Si2 the 4f contribution at EF will drop.

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Fermi surface instability inCeRh2Si2under pressure

Cited by 71 publications

References 21 publications

Collapse of antiferromagnetism in CeRh₂Si₂: volume versus entropy

Collapse of antiferromagnetism in CeRh₂Si₂: volume versus entropy

Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors

Fermi surface instabilities inCeRh2Si2at high magnetic field and pressure

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Fermi surface instability inCeRh2Si2under pressure

Cited by 71 publications

References 21 publications

Collapse of antiferromagnetism in CeRh2Si2: volume versus entropy

Collapse of antiferromagnetism in CeRh2Si2: volume versus entropy

Kramers degeneracy in a magnetic field and Zeeman spin-orbit coupling in antiferromagnetic conductors

Fermi surface instabilities inCeRh2Si2at high magnetic field and pressure

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Collapse of antiferromagnetism in CeRh₂Si₂: volume versus entropy

Collapse of antiferromagnetism in CeRh₂Si₂: volume versus entropy