Evidence for a delocalization quantum phase transition without symmetry breaking in CeCoIn
            <sub>5</sub>

Maksimovic, Nikola; Eilbott, Daniel; Cookmeyer, Taylor; Wan, Fanghui; Rusz, Ján; Nagarajan, Vikram; Haley, Shannon; Maniv, Eran; Gong, Amanda; Faubel, Stefano; Hayes, Ian; Bangura, A. F.; Singleton, John; Palmstrom, Johanna C.; Winter, Laurel; McDonald, R. D.; Jang, Sooyoung; Ai, Ping; Lin, Yi; Ciocys, Samuel; Gobbo, Jacob; Werman, Yochai; Oppeneer, Peter M.; Altman, Ehud; Lanzara, Alessandra; Analytis, James

doi:10.1126/science.aaz4566

Cited by 33 publications

(15 citation statements)

References 46 publications

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“…At ambient pressure we pass close to this QCP, resulting in the observed enhancement of the effective mass, whereas at higher pressures of 0.6 and 1.0 GPa away from this QCP, the relative absence of critical fluctuations would explain the largely field independent effective masses. This type of quantum criticality has been observed in the heavy-fermion system CeCoIn 5 and is associated with a delocalization of 4f electrons but instead of symmetry breaking, for example in the form of magnetic ordering, it is accompanied by a fractionalization of spin and charge [53].…”

Section: Phase Diagram and Qcpmentioning

confidence: 85%

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs₄Sb₁₂

et al. 2022

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CeOs4Sb12, a member of the skutterudite family, has an unusual semimetallic low-temperature L-phase that inhabits a wedge-like area of the field H - temperature T phase diagram. We have conducted measurements of electrical transport and megahertz conductivity on CeOs4Sb12 single crystals under pressures of up to 3 GPa and in high magnetic fields of up to 41 T to investigate the influence of pressure on the different H-T phase boundaries. While the high-temperature valence transition between the metallic H-phase and the L-phase is shifted to higher T by pressures of the order of 1 GPa, we observed only a marginal suppression of the S-phase that is found below 1 K for pressures of up to 1.91 GPa. High-field quantum oscillations have been observed for pressures up to 3.0 GPa and the Fermi surface of the highfield side of the H-phase is found to show a surprising decrease in size with increasing pressure, implying a change in electronic structure rather than a mere contraction of lattice parameters. We evaluate the field-dependence of the effective masses for different pressures and also reflect on the sample dependence of some of the properties of CeOs4Sb12 which appears to be limited to the low-field region.

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Section: Phase Diagram and Qcpmentioning

confidence: 85%

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs₄Sb₁₂

et al. 2022

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“…This signature is consistent with our KB QCP scenario. Interestingly, evidence of a delocalization (KB) transition has been observed in a closely related compound CeCo(In 1− x Sn x ) 5 near x ~ 0.016 37 . It is promising to expect that the KB QCP might also occur here.…”

Section: Introductionmentioning

confidence: 98%

The scaled-invariant Planckian metal and quantum criticality in Ce1−xNdxCoIn5

Chang¹,

Lei

Petrović

et al. 2023

Nat Commun

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The mysterious Planckian metal state, showing perfect T-linear resistivity associated with universal scattering rate, 1/τ = αkBT/ℏ with α ~ 1, has been observed in the normal state of various strongly correlated superconductors close to a quantum critical point. However, its microscopic origin and link to quantum criticality remains an outstanding open problem. Here, we observe quantum-critical T/B-scaling of the Planckian metal state in resistivity and heat capacity of heavy-electron superconductor Ce1−xNdxCoIn5 in magnetic fields near the edge of antiferromagnetism at the critical doping xc ~ 0.03. We present clear experimental evidences of Kondo hybridization being quantum critical at xc. We provide a generic microscopic mechanism to qualitatively account for this quantum critical Planckian state within the quasi-two dimensional Kondo-Heisenberg lattice model near Kondo breakdown transition. We find α is a non-universal constant and depends inversely on the square of Kondo hybridization strength.

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“…If such a unifying theory exists, with a pairing mechanism that under favorable conditions can give rise to the 140K superconductivity of mercury-barium-calcium copper oxide, would it be very surprising that under less favorable conditions the same pairing mechanism could also give rise to the 7K superconductivity of Pb, the poster-child for the conventional electron-phonon mechanism, the 'exotic' 2.3K superconductivity of CeCoIn5 [60] and 1.6 K superconductivity of U T e 2 [61], as well as the 'magic angle' 1.2K superconductivity of twisted graphene [62]?…”

Section: Introductionmentioning

confidence: 99%

Superconducting Materials: Judge, Jury and Executioner of BCS-electron-phonon Theory

Hirsch¹

2022

Preprint

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By a recent count, there are 32 different classes of superconducting materials, only 12 of which are generally believed to be "conventional", i.e. described by the conventional BCS-electron-phonon theory of superconductivity. In this perspective I critically examine the successes and failures of the conventional theory to describe conventional superconductors, and discuss what is understood and not understood about hydrogen-rich materials claimed to be high temperature conventional superconductors under high pressure. I argue that the current state of affairs calls for dethroning the conventional theory of its privileged status and seriously explore the alternative possibility that a single theory, different from the conventional theory, may describe superconductivity of all materials in a unified way.

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Evidence for a delocalization quantum phase transition without symmetry breaking in CeCoIn ₅

Cited by 33 publications

References 46 publications

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs₄Sb₁₂

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs₄Sb₁₂

The scaled-invariant Planckian metal and quantum criticality in Ce1−xNdxCoIn5

Superconducting Materials: Judge, Jury and Executioner of BCS-electron-phonon Theory

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Evidence for a delocalization quantum phase transition without symmetry breaking in CeCoIn 5

Cited by 33 publications

References 46 publications

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs4Sb12

The scaled-invariant Planckian metal and quantum criticality in Ce1−xNdxCoIn5

Superconducting Materials: Judge, Jury and Executioner of BCS-electron-phonon Theory

Contact Info

Product

Resources

About

Evidence for a delocalization quantum phase transition without symmetry breaking in CeCoIn ₅

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs₄Sb₁₂

Pressure-induced shift of effective Ce valence, Fermi energy and phase boundaries in CeOs₄Sb₁₂