Interplay between spin-density wave and induced local moments in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><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>

Минеев, В. П.; Zhitomirsky, M. E.

doi:10.1103/physrevb.72.014432

Cited by 83 publications

(86 citation statements)

References 51 publications

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“…The presence of this kink, when taken within the context of the analysis of Mineev and Zhitomirsky [15], indicates a scenario where there exists no coupling between the order parameters of the HO state and that of the high-pressure AFM phase, and furthermore suggests that sample impurities or uncharacterized strains may be culpable for the observed moment at low pressures. The persistence of this kink and its static position upon reducing T 0 with increased x is consistent with a vertical or nearly vertical HO/AFM transition occurring at P c =15 kbar; as this transition is indirectly probed, there can be no unambiguous determination as to the degree of its order.…”

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confidence: 99%

“…In an effort to explain the observed properties of URu 2 Si 2 , several microscopic models have been proposed [9,10,11,12,13,14,15]. In addition to the theoretical pursuits, many varied experimental techniques have been employed to confirm and/or constrain the proposed models; however, the experimental results fail to converge upon an encompassing microscopic description of the ordered states of URu 2 Si 2 , but do provide valuable insight when contextually analyzed.…”

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“…Pressuredependent neutron scattering, NMR, and µSR measurements all indicate an abrupt increase in the size of the ordered moment, with the magnitude of the moment saturating to a value consistent with bulk AFM above a currently disputed critical pressure [23,24,25,26]. The interpretation of this increase in moment is currently unresolved, but can be divided into two prevailing descriptions: an inhomogeneous, phase separated scenario where the increase in the moment is due to an increase in volume fraction of the observed, high-pressure moment [25,26]; and a scenario involving two order parameters describing the staggered magnetization and the HO state, with the details governed by the coupling between order parameters [15,24].With the progression of experimental and theoretical investigations into the ordered states of URu 2 Si 2 , now is a critical time to clarify and categorize experimental observations in order to enhance the understanding of the underlying phenomena. The URu 2−x Re x Si 2 system provides a unique opportunity to study the effects of pressure on a HO state whose ambient pressure transition temperature is reduced with rhenium concentration x [27].…”

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Competing Ordered Phases inURu2Si2: Hydrostatic Pressure and Rhenium Substitution

et al. 2007

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A persistent kink in the pressure dependence of the "hidden order" (HO) transition temperature of URu2−xRexSi2 is observed at a critical pressure Pc=15 kbar for 0 ≤ x ≤ 0.08. In URu2Si2, the kink at Pc is accompanied by the destruction of superconductivity; a change in the magnitude of a spin excitation gap, determined from electrical resistivity measurements; and a complete gapping of a portion of the Fermi surface (FS), inferred from a change in scattering and the competition between the HO state and superconductivity for FS fraction.PACS numbers: 75.30.Mb, 74.70.Tx, 81.30.Bx, 74.62.Fj Since its discovery over 20 years ago [1,2,3], the moderately heavy fermion compound URu 2 Si 2 has been the focus of many theoretical and experimental efforts designed to determine the elusive, hidden order parameter associated with the phase transition occurring at T 0 ≈ 17.5 K. The transition into this "hidden order" (HO) state is characterized by large anomalies (typical of magnetic ordering) in specific heat, electrical resistivity, thermal conductivity, and magnetization measurements [1,2,3,4,5,6,7]; however, only a small antiferromagnetic moment, insufficient to adequately explain the entropy released during the transition, was detected in low-temperature neutron diffraction experiments [8]. In addition to the puzzling order parameter of the HO state, URu 2 Si 2 undergoes a transition into an unconventional superconducting (SC) state, which coexists with weak antiferromagnetism (AFM), at T c ≈ 1.5 K. The potential interplay between the two ordered phases of URu 2 Si 2 as well as the nature of the HO state are underlying problems to our fundamental understanding of the properties of this compound.In an effort to explain the observed properties of URu 2 Si 2 , several microscopic models have been proposed [9,10,11,12,13,14,15]. In addition to the theoretical pursuits, many varied experimental techniques have been employed to confirm and/or constrain the proposed models; however, the experimental results fail to converge upon an encompassing microscopic description of the ordered states of URu 2 Si 2 , but do provide valuable insight when contextually analyzed. Low-temperature neutron diffraction measurements as a function of magnetic field provide evidence that the order parameter of the HO state must break time-reversal symmetry [16], and recent inelastic neutron scattering measurements reveal gapped spin excitations at incommensurate wavevectors [17]. Thermal transport measurements are consistent with the opening of a gap at the Fermi surface (FS), as previously suggested by optical conductivity and specific heat studies [3,18], depleting carriers and reducing electron-phonon scattering [5,6]. These exemplary measurements tend to converge upon a description of the HO state invoking the presence of a FS instability such as a spin density wave (SDW), further suggested by high-field measurements intimating the itinerant nature of the HO state [19].The application of pressure to URu 2 Si 2 further convolutes the discussion...

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Competing Ordered Phases inURu2Si2: Hydrostatic Pressure and Rhenium Substitution

et al. 2007

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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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“…Two important current lines of inquiry regarding the URu 2 Si 2 T − P phase diagram are how the HO-AFM phase boundary relates to 1) the higher-temperature PM-HO/AFM boundary, which might indicate whether HO and AFM coexist microscopically [23,24], and 2) the lower-temperature SC phase boundary. While some neutron scattering reports concluded that the HO-AFM boundary is separate from the PM-HO/AFM curve [23,25], a more recent report of neutron scattering and ac susceptibility suggested a sharp transition at 7 kbar, consistent with HO-AFM phase separation [26,27], and supported a ∼ 4 kbar SC critical pressure.…”

Section: Introductionmentioning

confidence: 99%

Hydrostaticity and hidden order: effects of experimental conditions on the temperature–pressure phase diagram of URu₂Si₂

Butch

Jeffries

Zocco

et al. 2009

High Pressure Research

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The pressure-dependence of the hidden order phase transition of URu2Si2 is shown to depend sensitively upon the quality of hydrostatic pressure conditions during electrical resistivity measurements. Hysteresis in pressure is demonstrated for two choices of pressure medium: the commonly-used mixture of 1:1 Fluorinert FC70/FC77 and pure FC75. In contrast, no hysteresis is observed when the pressure medium is a 1:1 mixture of n-pentane/isoamyl alcohol, as it remains hydrostatic over the entire studied pressure range. Possible ramifications for the interpretation of the temperature-pressure phase diagram of URu2Si2 are discussed.

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Interplay between spin-density wave and induced local moments inURu2Si2

Cited by 83 publications

References 51 publications

Competing Ordered Phases inURu2Si2: Hydrostatic Pressure and Rhenium Substitution

Competing Ordered Phases inURu2Si2: Hydrostatic Pressure and Rhenium Substitution

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

Hydrostaticity and hidden order: effects of experimental conditions on the temperature–pressure phase diagram of URu₂Si₂

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Interplay between spin-density wave and induced local moments inURu2Si2

Cited by 83 publications

References 51 publications

Competing Ordered Phases inURu2Si2: Hydrostatic Pressure and Rhenium Substitution

Competing Ordered Phases inURu2Si2: Hydrostatic Pressure and Rhenium Substitution

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

Hydrostaticity and hidden order: effects of experimental conditions on the temperature–pressure phase diagram of URu2Si2

Contact Info

Product

Resources

About

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

Hydrostaticity and hidden order: effects of experimental conditions on the temperature–pressure phase diagram of URu₂Si₂