Modulated Spin Liquid: A New Paradigm for<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>URu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>

Pépin, C.; Norman, M. R.; Burdin, Sébastien; Ferraz, A.

doi:10.1103/physrevlett.106.106601

Cited by 70 publications

(87 citation statements)

References 37 publications

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“…7d, shows a reasonable agreement between the shapes of the bands near E F , but with an experimental effective mass ten times larger, given by the factor in energy scales needed to overlap the theoretical and experimental dispersions. This large mass renormalization, resulting from the heavy f-states that govern the low-energy band masses of URu 2 Si 2 , is taken into account by other theories or calculations based on a dual localitinerant approach 13,24,20 . An additional notable difference between the experimental and LDA dispersions along (100) is that at the petals, the data show the anti-crossing-like 5 meV gap, while in the calculations the band-crossing yielding the petals is not avoided, neither in the PM nor in the HO states.…”

Section: )mentioning

confidence: 99%

Momentum-resolved hidden-order gap reveals symmetry breaking and origin of entropy loss in URu2Si2

et al. 2014

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Spontaneous symmetry breaking in physical systems leads to salient phenomena at all scales, from the Higgs mechanism and the emergence of the mass of the elementary particles, to superconductivity and magnetism in solids. The hidden-order state arising below 17.5 K in URu 2 Si 2 is a puzzling example of one of such phase transitions: its associated broken symmetry and gap structure have remained longstanding riddles. Here we directly image how, across the hidden-order transition, the electronic structure of URu 2 Si 2 abruptly reconstructs. We observe an energy gap of 7 meV opening over 70% of a large diamond-like heavy-fermion Fermi surface, resulting in the formation of four small Fermi petals, and a change in the electronic periodicity from body-centred tetragonal to simple tetragonal. Our results explain the large entropy loss in the hidden-order phase, and the similarity between this phase and the high-pressure antiferromagnetic phase found in quantum-oscillation experiments.

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Section: )mentioning

confidence: 99%

Momentum-resolved hidden-order gap reveals symmetry breaking and origin of entropy loss in URu2Si2

et al. 2014

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“…We compile in Table 2 a section of the large number of theoretical efforts [45][46][47][48][49][50][51][52][53][54][55][56][57][58][59][60][61] to interpret the HO phase transition through analytic models and calculations. Note how these have spanned almost 20 years of work.…”

Section: Introductionmentioning

confidence: 99%

Hidden order behaviour in URu₂Si₂(A critical review of the status of hidden order in 2014)

Mydosh

Oppeneer

2014

Philosophical Magazine

117

108

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Throughout the past three decades the hidden order (HO) problem in URu 2 Si 2 has remained a "hot topic" in the physics of strongly correlated electron systems with well over 600 publications related to this subject. Presently in 2014 there has been significant progress in combining various experimental results embedded within electronic structure calculations using density functional theory (DFT) to give a consistent description of the itinerant behaviour of the HO transition and its low temperature state. Here we review six different experiments: ARPES, quantum oscillations, neutron scattering, RXD, optical spectroscopy and STM/STS. We then establish the consistencies among these experiments when viewed through the Fermi-surface nesting, folding and gapping framework as predicted by DFT. We also discuss a group of other experiments (torque, cyclotron resonance, NMR and XRD) that are more controversial and are presently in a "transition" state regarding their interpretation as rotational symmetry breaking and dotriacontapole formation. There are also a series of recent "exotic" experiments (Raman scattering, polar Kerr effect and ultrasonics) that require verification, yet they offer new insights into the HO symmetry breaking and order parameter. We conclude with some constraining comments on the microscopic models that rely on localised 5f -U states and strong Ising anisotropy for explaining the HO transition, and with an examination of different models in the light of recent experiments.

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“…Whereas appearing clearly in the thermodynamic and transport quantities 1,4,5 , the order parameter of this electronic hidden order (HO) state could not be determined by any usual or sophisticated experimental techniques 6 . Theoretical proposals are numerous, starting from itinerant or localized picture for the 5f electrons [7][8][9][10][11][12][13][14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Lattice dynamics of the heavy-fermion compoundURu2Si2

et al. 2015

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We report a comprehensive investigation of the lattice dynamics of URu2Si2 as a function of temperature using Raman scattering, optical conductivity and inelastic neutron scattering measurements as well as theoretical ab initio calculations. The main effects on the optical phonon modes are related to Kondo physics. The B1g (Γ3 symmetry) phonon mode slightly softens below ∼100 K, in connection with the previously reported softening of the elastic constant, C11 − C12, of the same symmetry, both observations suggesting a B1g symmetry-breaking instability in the Kondo regime. Through optical conductivity, we detect clear signatures of strong electron-phonon coupling, with temperature dependent spectral weight and Fano line shape of some phonon modes. Surprisingly, the line shapes of two phonon modes, Eu(1) and A2u(2), show opposite temperature dependencies. The A2u(2) mode loses its Fano shape below 150 K, whereas the Eu(1) mode acquires it below 100 K, in the Kondo cross-over regime. This may point out to momentum-dependent Kondo physics. By inelastic neutron scattering measurements, we have drawn the full dispersion of the phonon modes between 300 K and 2 K. No remarkable temperature dependence has been obtained including through the hidden order transition. Ab initio calculations with the spin-orbit coupling are in good agreement with the data except for a few low energy branches with propagation in the (a,b) plane.

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Modulated Spin Liquid: A New Paradigm forURu2Si2

Cited by 70 publications

References 37 publications

Momentum-resolved hidden-order gap reveals symmetry breaking and origin of entropy loss in URu2Si2

Momentum-resolved hidden-order gap reveals symmetry breaking and origin of entropy loss in URu2Si2

Hidden order behaviour in URu₂Si₂(A critical review of the status of hidden order in 2014)

Lattice dynamics of the heavy-fermion compoundURu2Si2

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Modulated Spin Liquid: A New Paradigm forURu2Si2

Cited by 70 publications

References 37 publications

Momentum-resolved hidden-order gap reveals symmetry breaking and origin of entropy loss in URu2Si2

Momentum-resolved hidden-order gap reveals symmetry breaking and origin of entropy loss in URu2Si2

Hidden order behaviour in URu2Si2(A critical review of the status of hidden order in 2014)

Lattice dynamics of the heavy-fermion compoundURu2Si2

Contact Info

Product

Resources

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Hidden order behaviour in URu₂Si₂(A critical review of the status of hidden order in 2014)