Superconductivity in the correlated pyrochlore<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cd</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Re</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn

Jin, Rongying; He, Jian; McCall, S.; Alexander, C. Scott; Drymiotis, Fivos; Mandrus, David

doi:10.1103/physrevb.64.180503

Cited by 124 publications

(95 citation statements)

References 14 publications

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“…Indeed, specific heat measurements on Cd 2 Re 2 O 7 indicated an enhanced electronic specific heat coefficient, γ ∼ 30 mJ/mol-K 2 . [5,3] The behavior of the upper critical field H c2 vs T also indicates that the Cooper pairs are composed of rather heavy quasiparticles. Qualitatively, the optical measurement is in agreement with the enhancement picture of effective mass.…”

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confidence: 99%

“…The later argument is also supported by Hall effect measurement. [5] Fig . 3 shows the real part of the dielectric function, ǫ 1 (ω), as a function of frequency.…”

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confidence: 99%

“…They were well characterized by x-ray diffraction, electron diffraction, resistivity, specific heat and magnetic susceptibility measurements, showing superconductivity below T c ∼ 1.5 K. [2,5,6] The crystal structure is facecentered cubic. Near normal incidence reflectivity spectra, R(ω), were measured from 30 to 40000 cm −1 on a natural growth surface normal to the a-axis.…”

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confidence: 99%

“…[2] Very recently it was found that Cd 2 Re 2 O 7 becomes superconducting below 2 K. This makes this compound the first superconductor in the pyrochlore family. [3][4][5] It is of great interest to investigate the peculiar electronic state lying behind the superconductivity. For this purpose we have investigated the optical properties of the compound at different temperatures in the normal state.…”

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confidence: 99%

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Optical evidence for mass enhancement of quasiparticles in pyrochloreCd2Re2O
Wang
¹
,
McGuire
²
,
Timusk
³

et al. 2002
Phys. Rev. B
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We report on the results of optical studies of the newly discovered superconductor Cd2Re2O7 in the normal state. We show that the compound has an exotic metallic state at low temperature. The optical conductivity spectrum exhibits two distinct features: a sharp renormalized resonance mode at zero frequency and a broad mid-infrared excitation band. Detailed analysis reveals a moderate enhancement of the effective mass at low temperature and low frequency.PACS numbers: 71.27.+a, 74.25.Gz, 74.70.Tx The magnetically frustrated pyrochlore oxides, which have a general formula A 2 B 2 O 7 where B stands for a transition metal, have attracted considerable interest recently. The B cations are six-fold coordinated and located within distorted octahedra. Those octahedra are corner-sharing and form a three-dimensional network.[1] Many of the compounds undergo a metal to nonmetal transition without an associated structural change. Cd 2 Re 2 O 7 is one of a few exceptions, which displays solely metallic behavior below room temperature. This compound undergoes a second-order phase transition at around 200 K and enters a better metallic state in low temperature.[2] Very recently it was found that Cd 2 Re 2 O 7 becomes superconducting below 2 K. This makes this compound the first superconductor in the pyrochlore family. [3][4][5] It is of great interest to investigate the peculiar electronic state lying behind the superconductivity. For this purpose we have investigated the optical properties of the compound at different temperatures in the normal state. An exotic metallic phase with strongly correlated electrons was revealed in the study.The single crystals of Cd 2 Re 2 O 7 were grown using a vapor-transport method described in detail in ref [6]. They were well characterized by x-ray diffraction, electron diffraction, resistivity, specific heat and magnetic susceptibility measurements, showing superconductivity below T c ∼ 1.5 K. [2,5,6] The crystal structure is facecentered cubic. Near normal incidence reflectivity spectra, R(ω), were measured from 30 to 40000 cm −1 on a natural growth surface normal to the a-axis. Standard Kramers-Kronig transformations were employed to derive the frequency-dependent conductivity and dielectric function.Cd 2 Re 2 O 7 exhibits an unusual temperature-dependent dc resistivity in the normal-state: it is almost Tindependent at high temperature but decreases rapidly below 200 K. The behavior, displayed in the inset of Fig. 1, is inconsistent with the traditional electron-phonon scattering mechanism, which should yield a linear Tdependent behavior at high temperature. Below 50 K, the dc resistivity follows an approximately quadratic Tdependence, implying electron-electron scattering and a Fermi-liquid-like state at low temperature. The reflectivity data at 300 K, 150 K and 24 K are shown in Fig. 1. We note immediately that the reflectivity in the farinfrared spectral range increases with decreasing temperature, characteristic of metallic response. However, the reflectivity in the mid-infrared r...

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confidence: 99%

“…The later argument is also supported by Hall effect measurement. [5] Fig . 3 shows the real part of the dielectric function, ǫ 1 (ω), as a function of frequency.…”

mentioning

confidence: 99%

mentioning

confidence: 99%

mentioning

confidence: 99%

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Optical evidence for mass enhancement of quasiparticles in pyrochloreCd2Re2O
Wang
¹
,
McGuire
²
,
Timusk
³

et al. 2002
Phys. Rev. B
Self Cite
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1
22
0
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“…We stress that Cd 2 Re 2 O 7 loses inversion symmetry as a result of phase transition with temperature in contrast to the fact that the hitherto known NCS superconductors lack their inversion symmetry throughout the temperature range; one would expect fluctuation-related phenomena only for the former. However, the superconductivity of Cd 2 Re 2 O 7 at ambient pressure has been established as a conventional s-wave type [20][21][22][23]30,38,39]. On the other hand, applying pressure to this material enhances T c up to 3 K at 2 GPa [34].…”

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confidence: 99%

Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7
Yamaura
¹
,
Takeda
²
,
Ikeda
³

et al. 2017
Phys. Rev. B
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The 5d-transition metal pyrochlore oxide Cd 2 Re 2 O 7 , which was recently suggested to be a prototype of the spin-orbit-coupled metal [Phys. Rev. Lett. 115, 026401 (2015)], exhibits an inversion-symmetry breaking (ISB) transition at 200 K and a subsequent superconductivity below 1 K at ambient pressure. We study the crystal structure at high pressures up to 5 GPa by means of synchrotron X-ray powder diffraction. A rich structural phase diagram is obtained, which contains at least seven phases and is almost consistent with the electronic phase diagram determined by previous resistivity measurements. Interestingly, the ISB transition vanishes at ~4 GPa, where the enhancement of the upper critical field was observed in resistivity. Moreover, it is shown that the point groups at 8 K, probably kept in the superconducting phases, sequentially transform into piezoelectric, ferroelectric, and centrosymmetric structures on the application of pressure.

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Narrow Band Gap Compounds with β‐Pyrochlore Structure in the A₂O‐V₂O₅‐2TeO₃ (A=Rb, Cs) System

et al. 2023

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Two new isostructural compounds with composition of Rb + V 3 + 0.125 V 5 + 0.625 Te 6 + 1.25 O 6 and Cs + V 3 + 0.125 V 5 + 0.625 Te 6 + 1.25 O 6 have been synthesized by solid-state reaction. The crystal structure has been determined by X-ray diffraction analysis using Rietveld refinement. Both compounds possess β-pyrochlore structuretype with cubic space group Fd-3 m (Z = 8); the unit cell parameters: a = 10.04120(27) Å for RbV 0.75 Te 1.25 O 6 Å and a = 10.09119(23) Å for CsV 0.75 Te 1.25 O 6 . The oxidation states of vanadium and tellurium have been confirmed by X-ray photoelectron spectroscopy. The compounds contain vanadium in mixed valence state (3 + and 5 +). The compounds possess the unusual narrow band gap for oxide compounds -in the infrared (IR) range (~0.6 eV). The schematic electronic structure of the compounds has been estimated using XPS, UPS and electronic conductivity data; however, the shifts of the top of the valence edge and the bottom of the conduction band in the water conditions have been calculated using theoretical approximation. The thermal behavior of obtained compounds has been studied by differential thermal analysis. RbV 0.75 Te 1.25 O 6 and CsV 0.75 Te 1.25 O 6 melts at low temperatures (~500 °C) with decomposition and weight loss. The RbV 0.75 Te 1.25 O 6 powder decomposes to amorphous phase, whereas CsV 0.75 Te 1.25 O 6 transform into new β-pyrochlore compound with another composition.

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Superconductivity in the correlated pyrochloreCd2Re2O7

Cited by 124 publications

References 14 publications

Optical evidence for mass enhancement of quasiparticles in pyrochloreCd2Re2O
Wang
¹
,
McGuire
²
,
Timusk
³

et al. 2002
Phys. Rev. B
Self Cite
27
1
22
0
View full text Add to dashboard Cite

Optical evidence for mass enhancement of quasiparticles in pyrochloreCd2Re2O
Wang
¹
,
McGuire
²
,
Timusk
³

et al. 2002
Phys. Rev. B
Self Cite
27
1
22
0
View full text Add to dashboard Cite

Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7
Yamaura
¹
,
Takeda
²
,
Ikeda
³

et al. 2017
Phys. Rev. B
25
1
27
0
View full text Add to dashboard Cite

Narrow Band Gap Compounds with β‐Pyrochlore Structure in the A₂O‐V₂O₅‐2TeO₃ (A=Rb, Cs) System

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Superconductivity in the correlated pyrochloreCd2Re2O7

Cited by 124 publications

References 14 publications

Optical evidence for mass enhancement of quasiparticles in pyrochloreCd2Re2OWang1, McGuire2, Timusk3 et al. 2002Phys. Rev. BSelf Cite271220View full textAdd to dashboardCite

Optical evidence for mass enhancement of quasiparticles in pyrochloreCd2Re2OWang1, McGuire2, Timusk3 et al. 2002Phys. Rev. BSelf Cite271220View full textAdd to dashboardCite

Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7Yamaura1, Takeda2, Ikeda3 et al. 2017Phys. Rev. B251270View full textAdd to dashboardCite

Narrow Band Gap Compounds with β‐Pyrochlore Structure in the A2O‐V2O5‐2TeO3 (A=Rb, Cs) System

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Optical evidence for mass enhancement of quasiparticles in pyrochloreCd2Re2O
Wang
¹
,
McGuire
²
,
Timusk
³

et al. 2002
Phys. Rev. B
Self Cite
27
1
22
0
View full text Add to dashboard Cite

Optical evidence for mass enhancement of quasiparticles in pyrochloreCd2Re2O
Wang
¹
,
McGuire
²
,
Timusk
³

et al. 2002
Phys. Rev. B
Self Cite
27
1
22
0
View full text Add to dashboard Cite

Successive spatial symmetry breaking under high pressure in the spin-orbit-coupled metal Cd2Re2O7
Yamaura
¹
,
Takeda
²
,
Ikeda
³

et al. 2017
Phys. Rev. B
25
1
27
0
View full text Add to dashboard Cite

Narrow Band Gap Compounds with β‐Pyrochlore Structure in the A₂O‐V₂O₅‐2TeO₃ (A=Rb, Cs) System