Symmetry and correlations underlying hidden order in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><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:mrow></mml:math>

Butch, Nicholas P.; Manley, M. E.; Jeffries, J. R.; Janoschek, M.; Huang, Kevin; Maple, M. B.; Said, Ayman; Leu, Bogdan M.; Lynn, J. W.

doi:10.1103/physrevb.91.035128

Cited by 41 publications

(56 citation statements)

References 115 publications

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“…No remarkable temperature dependence has been obtained by INS including through the hidden order transition. Thanks to polarized inelastic neutron scattering, we were able to distinguish between phonon and magnon modes near the X and Γ points of the BZ, shedding light on previous reports 33,63 . The ab initio calculations of phonon energies and polarization vectors allowed us for the detailed analysis of phonon modes in the zone center and along the high-symmetry directions.…”

Section: General Discussion and Conclusionsupporting

confidence: 63%

“…A more detailed study by ultrasonic measurements versus temperature and under high magnetic field 31,32 reported a softening of the elastic constant C 11 − C 12 below ∼ 120 K suggesting a B 1g -type (or Γ 3 ) lattice instability in connection with the Kondo cross-over. Quite recently, an anomalous phonon softening below T 0 in the [1,1,0] direction has been reported by inelastic neutron scattering 33 , calling on for further detailed studies.…”

Section: Introductionmentioning

confidence: 99%

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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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Section: General Discussion and Conclusionsupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Lattice dynamics of the heavy-fermion compoundURu2Si2

et al. 2015

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“…1 was fitted using a convolution of S( q,E) with the resolution ellipsoid, where we have assumed a quadratic dispersion 2 near both Q i , with i = 0,1. We have set Q 1 = (1.41,0,0) as this is at the boundary of the body-centered tetragonal reciprocal lattice, on which the dispersion minimum seems to be centered [39]. We infer dispersion parameters a ih , a ik , and a il from the results of Broholm et al [29].…”

Section: Analysis Of Energy Scansmentioning

confidence: 99%

Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition ofURu2Si2

et al. 2015

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Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu2Si2 Niklowitz, P.G.; Dunsiger, S.R.; Pfleiderer, C.; Link, P.; Schneidewind, A.; Faulhaber, E.; Vojta, M.; Huang, Y.; Mydosh, J.A. Published in:Physical Review B DOI:10.1103/PhysRevB.92.115116 Link to publicationCitation for published version (APA): Niklowitz, P. G., Dunsiger, S. R., Pfleiderer, C., Link, P., Schneidewind, A., Faulhaber, E., ... Mydosh, J. A. (2015). Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition of URu2Si2. Physical Review B, 92(11), [115116]. https://doi.org/10.1103/PhysRevB.92.115116 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We report low-energy inelastic neutron scattering data of the paramagnetic (PM) to hidden-order (HO) phase transition at T 0 = 17.5 K in URu 2 Si 2 . While confirming previous results for the HO and PM phases, our data reveal a pronounced wave-vector dependence of low-energy excitations across the phase transition. To analyze the energy scans we employ a damped harmonic oscillator model containing a fit parameter 1/ which is expected to diverge at a second-order phase transition. Counter to expectations the excitations at Q 1 ≈ (1.4,0,0) show an abrupt steplike suppression of 1/ below T 0 , whereas excitations at Q 0 = (1,0,0), associated with large-moment antiferromagnetism (LMAF) under pressure, show an enhancement and a pronounced peak of 1/ at T 0 . Therefore, at the critical HO temperature T 0 , LMAF fluctuations become nearly critical as well. This is the behavior expected of a "supervector" order parameter with nearly degenerate components for the HO and LMAF leading to nearly isotropic fluctuations in the combined order-parameter space.

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“…* Corresponding author: Dmytro.Inosov@tu-dresden. de A handful of earlier works on magnetic heavy-fermion metals, where conduction electrons are involved in the formation of magnetic order, suggest that the low-energy dynamic spin susceptibility χ(ω, Q), measured with diffuse neutron scattering, provides direct information about the nesting vectors [7][8][9][10][11][12][13][14][15][16]. Due to the bulk sensitivity of neutron scattering, it therefore serves as a complementary method for probing the 3D electronic structure.…”

Section: Introductionmentioning

confidence: 99%

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
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We investigate the doping-induced changes in the electronic structure of CeB 6 on a series of substituted Ce 1−x R x B 6 samples (R = La, Nd) using diffuse neutron scattering. We observe a redistribution of magnetic spectral weight across the Brillouin zone, which we associate with the changes in the Fermi-surface nesting properties related to the modified charge carrier concentration. In particular, a strong diffuse peak at the corner of the Brillouin zone (R point), which coincides with the propagation vector of the elusive antiferroquadrupolar (AFQ) order in CeB 6 , is rapidly suppressed by both La and Nd doping, like the AFQ order itself. The corresponding spectral weight is transferred to the X (00 1 2 ) point, ultimately stabilizing a long-range AFM order at this wave vector at the Nd-rich side of the phase diagram. At an intermediate Nd concentration, a broad diffuse peak with multiple local maxima of intensity is observed around the X point, evidencing itinerant frustration that gives rise to multiple ordered phases for which Ce 1−x Nd x B 6 is known. On the La-rich side of the phase diagram, however, dilution of the magnetic moments prevents the formation of a similar (00 1 2 )-type order despite the presence of nesting. Our results demonstrate how diffuse neutron scattering can be used to probe the nesting vectors in complex f-electron systems directly, without reference to the single-particle band structure, and emphasize the role of Fermi surface geometry in stabilizing magnetic order in rare-earth hexaborides.

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Symmetry and correlations underlying hidden order inURu2Si2

Cited by 41 publications

References 115 publications

Lattice dynamics of the heavy-fermion compoundURu2Si2

Lattice dynamics of the heavy-fermion compoundURu2Si2

Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition ofURu2Si2

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
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Symmetry and correlations underlying hidden order inURu2Si2

Cited by 41 publications

References 115 publications

Lattice dynamics of the heavy-fermion compoundURu2Si2

Lattice dynamics of the heavy-fermion compoundURu2Si2

Role of commensurate and incommensurate low-energy excitations in the paramagnetic to hidden-order transition ofURu2Si2

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and Nikitin1, Portnichenko2, Dukhnenko3 et al. 2018Phys. Rev. B123160View full textAdd to dashboardCite

Contact Info

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About

Doping-induced redistribution of magnetic spectral weight in the substituted hexaborides Ce1−xLaxB6 and
Nikitin
¹
,
Portnichenko
²
,
Dukhnenko
³

et al. 2018
Phys. Rev. B
12
3
16
0
View full text Add to dashboard Cite