Pressure–temperature phase diagram of the heavy-electron superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" altimg="si34.gif" overflow="scroll"><mml:msub><mml:mrow><mml:mi>URu</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mrow><mml:mi>Si</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:math>

Arima, Hiroshi; Matsuda, Kazuyuki; Kawasaki, Ikuo; Tenya, Kenichi; Yokoyama, M.; Sekine, Chihiro; Tateiwa, Naoyuki; Kobayashi, Tatsuo; Kawarazaki, S.; Yoshizawa, H.

doi:10.1016/j.jmmm.2006.10.008

Cited by 166 publications

(208 citation statements)

References 46 publications

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“…Gradually, however, it became apparent that the tiny ordered moment of 0.03 µ B per U atom was far too small to account for the specific heat data: more entropy was being quenched at the transition, on the order of R ln(2), than could be ascribed to magnetic ordering. More recently it has been argued [35] that the small moment antiferromagnet (SM-AFM) state is extrinsic, caused by strain regions in the lattice, and is not a property of the hidden order state. In addition, when hydrostatic pressure is applied to the crystal, there is a first-order phase transition to the LM-AFM state, further suggesting that the hidden order is unrelated to antiferromagnetism.…”

Section: The Hidden Order Statementioning

confidence: 99%

Optical study of hybridization and hidden order in URu₂Si₂

Hall

Timusk

2014

Philosophical Magazine

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We summarize existing optical data of URu 2 Si 2 to clarify the nature of the hidden order transition in this heavy fermion metal. Hybridization develops between 50 K and 17.5 K, and a coherent Drude peak emerges which mirrors the changes in the dc resistivity. The Drude weight indicates that there is little change in the effective mass of these carriers in this temperature range. In addition, there is a flat background conductivity that develops a partial hybridization gap at 10 meV as the temperature is lowered, shifting spectral weight to higher frequencies above 300 meV. Below 30 K the carriers become increasingly coherent and Fermi-liquid-like as the hidden order transition is approached. The hidden order state in URu 2 Si 2 is characterized by multiple anisotropic gaps. The gap parameter ∆a = 3.2 meV in the ab-plane. In the c-direction, there are two distinct gaps with magnitudes of ∆ c1 = 2.7 meV and ∆ c2 = 1.8 meV. These observations are in good agreement with other spectroscopic measurements. Overall, the spectrum can be fit by a Dynes-type density of states model to extract values of the hidden order gap. The transfer of spectral weight strongly resembles what one sees in density wave transitions.

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Section: The Hidden Order Statementioning

confidence: 99%

Optical study of hybridization and hidden order in URu₂Si₂

Hall

Timusk

2014

Philosophical Magazine

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“…Applying pressure to URu 2 Si 2 induces a first order phase transition from the HO to a large moment antiferromagnetic (LAFM) state at P x = 0.5-0.9 GPa. [4][5][6][7][8] The bulk-SC state exists only below P x . 5,6 Previous studies have reported unusual electrical transport in URu 2 Si 2 .…”

mentioning

confidence: 99%

“…[4][5][6][7][8] The bulk-SC state exists only below P x . 5,6 Previous studies have reported unusual electrical transport in URu 2 Si 2 . 6,9 However, there is no consistency in the reported values of the exponent n obtained from the fitting of the resistivity data with a general power law ρ 0 + AT n .…”

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confidence: 99%

Strong correlation between anomalous quasiparticle scattering and unconventional superconductivity in the hidden-order phase of URu2Si2

et al. 2012

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The pressure dependent electrical resistivity of URu2Si2 has been studied at high pressure across the first order phase boundary of Px where the ground state switches under pressure from "hidden order" (HO) to large moment antiferromagnetic (LAFM) states. The electrical transport in URu2Si2 at low temperatures shows a strong sample dependence. We have measured an ultra-clean single crystal whose quality is the highest among those used in previous studies. The generalized power law ρ = ρ0 + AnT n analysis finds that the electric transport property deviates from Fermi liquid theory in the HO phase but obeys the theory well above Px. The analysis using the polynomial in T expression ρ = ρ0 + α1T + α2T 2 reveals the relation α1/α2 ∝ Tsc in the HO phase. While the pressure dependence of α2 is very weak, α1 is roughly proportional to Tsc. This suggests a strong correlation between the anomalous quasiparticle scattering and the superconductivity and that both have a common origin. The present study clarifies a universality of the HO phase inherent in strongly correlated electron superconductors near quantum criticality.

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“…Such tuning is generally accomplished in the laboratory by the application of external pressure, magnetic field, or chemical substitution, and all three approaches are well represented in the literature. While the application of pressure does suppress superconductivity [92], it also transitions the system from HO into an antiferromagnetic state at 8 kbar [81,96]. Despite this change in ground state, the anomalies in the bulk properties associated with the HO and antiferromagnetic phase transitions are similar and changes in the T dependence are subtle between the two phases [93,95,97,98].…”

Section: Uru 2 Simentioning

confidence: 99%

“…The HO phase is so named because its ordering transition is accompanied by a large BCS-like specific heat anomaly [77] whose entropy cannot be accounted for by the small associated antiferromagnetic moment [80]. While it is now widely accepted that the antiferromagnetic moment is not intrinsic to the HO phase [81], the search for an alternative order parameter continues. Theoretical descriptions of the HO parameter can be broadly divided into those based on local or itinerant degrees of freedom, as indicated by some recent proposals, which include quadrupolar order [82], nesting-driven [83,84], and unconventional Kondo scenarios [85].…”

Section: Uru 2 Simentioning

confidence: 99%

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

et al. 2010

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Standard models for simple metals and insulators often fail for systems based on elements with unstable d-or f -electron shells, where strong electronic correlations can generate new and unexpected states of matter. Such a scenario can often be induced when a magnetic phase transition is tuned to absolute zero temperature by an external control parameter such as chemical composition, pressure or magnetic field. At the resulting quantum critical point (QCP), emergent phenomena, such as unconventional superconductivity and novel magnetic phases are frequently observed. The temperature and energy dependences of the physical properties are also found to deviate from expectations for a simple Fermi liquid. This "non-Fermi-liquid" (NFL) behavior is commonly manifested as weak power laws and logarithmic divergences in the physical properties at low temperatures and is often found in a V-shaped region near a QCP, which has become the "classic" QCP phase diagram. However, there is also a growing number of materials where the NFL behavior either occurs far away from the QCP, within an ordered phase, or may not be associated with any putative QCP. Thus, after nearly 20 years of research, it remains unknown whether NFL physics is universal, or if a multitude of unique subclasses exist. In this article, we review research that has primarily been carried out in our laboratory on systems that exhibit NFL behavior that does not conform to the "classic" QCP scenario.

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Pressure–temperature phase diagram of the heavy-electron superconductor URu2Si2

Cited by 166 publications

References 46 publications

Optical study of hybridization and hidden order in URu₂Si₂

Optical study of hybridization and hidden order in URu₂Si₂

Strong correlation between anomalous quasiparticle scattering and unconventional superconductivity in the hidden-order phase of URu2Si2

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

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Pressure–temperature phase diagram of the heavy-electron superconductor URu2Si2

Cited by 166 publications

References 46 publications

Optical study of hybridization and hidden order in URu2Si2

Optical study of hybridization and hidden order in URu2Si2

Strong correlation between anomalous quasiparticle scattering and unconventional superconductivity in the hidden-order phase of URu2Si2

Non-Fermi Liquid Regimes and Superconductivity in the Low Temperature Phase Diagrams of Strongly Correlated d- and f-Electron Materials

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Optical study of hybridization and hidden order in URu₂Si₂

Optical study of hybridization and hidden order in URu₂Si₂