Enhanced Superconductivity by Electron Renormalization of a Directly Observed Brout-Visscher Local Phonon: Re in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Mo</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Re</mml:mi></mml:mrow><mml:mrow><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml

Shum, D.; Bevolo, A. J.; Staudenmann, J.‐L.; Wolf, E. L.

doi:10.1103/physrevlett.57.2987

Cited by 18 publications

(17 citation statements)

References 16 publications

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“…The discrepancy, that of x-ray data pointing towards a harmonic solid whereas Mossbauer data pointing towards an anharmonic solid has been attributed to the sensitivity of the Mossbauer technique to anharmonic contributions due to higher order terms [10]. It has been argued that anharmonicity is an essential feature of both intermetallic [18,19,24] and metal oxide supercondutors [20][21][22][23].…”

Section: Introductionmentioning

confidence: 98%

On mossbauer dynamics in Nb3Sn

Razdan

2000

Pramana - J Phys

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Section: Introductionmentioning

confidence: 98%

On mossbauer dynamics in Nb3Sn

Razdan

2000

Pramana - J Phys

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“…Experimental studies done in mid 1980s and early 1990s suggested the possibility of Re influenced softening of the phonon spectrum [4] and a change in the electron density of states (DOS) [5] in the Mo 1−x Re x alloys. But these phenomena could not completely explain the large non-monotonic enhancement of T C in the Mo 1−x Re x alloys.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy

Sundar¹,

Banik²,

Chandra³

et al. 2016

J. Phys.: Condens. Matter

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Abstract.We have studied the electronic structure of Mo rich Mo 1−x Re x alloys (0≤ x ≤0.4) using valence band photoemission spectroscopy in the photon energy range 23-70 eV and density of states calculations. Comparison of the photoemission spectra with the density of states calculations suggests that with respect to the Fermi level E F , the d states lie mostly in the range 0 to -6 eV binding energy whereas s states lie in the range -4 to -10 eV binding energy. We have observed two resonances in the photoemission spectra of each sample, one at about 35 eV photon energy and other at about 45 eV photon energy. Our analysis suggest that the resonance at 35 eV photon energy is related to the Mo 4p-5s transition and the resonance at 45 eV photon energy is related to the contribution from both the Mo 4p-4d transition (threshold: 42 eV) and Re 5p-5d transition (threshold: 46 eV). In the CIS plot, the resonance at 35 eV incident photon energy for binding energy features in the range of E F (B.E. = 0) to -5 eV becomes progressively less prominent with the increasing Re concentration x and vanishes for x > 0.2. The difference plots obtained by subtracting the valence band photoemission spectrum of Mo from that of Mo 1−x Re x alloys, measured at 47 eV photon energy, reveal that the Re d like states appear near E F when Re is alloyed with Mo. These results indicate that interband s-d interaction, which is weak in Mo, increases with the increasing x and influences the nature of superconductivity in the alloys with higher x.

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“…Rhenium-molybdenum alloys in the phase and the A15 structure as well as the Re-W hcp alloy system have been studied because of their superconducting properties. [6][7][8] Tungsten has been suggested as armor material in plasma facing components in future fusion devices. This has increased the interest in the Re-W system because the heavy neutron irradiation from the fusion process transforms W atoms into Re.…”

Section: Introductionmentioning

confidence: 99%

Dynamical and thermodynamical instabilities in the disorderedRexW1−xsystem

1999

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The dynamical and thermodynamical stability of the bcc and fcc disordered Re x W 1Ϫx system is studied within the density-functional theory. The configurational part of the free energy is obtained from ab initio electron structure calculations together with the cluster expansion and the cluster variation formalism. Electronic excitations are accounted for through the temperature-dependent Fermi-Dirac distribution. The lattice dynamics of Re and W is studied using the density-functional linear-response theory. The calculated dispersion curves show that fcc Re is dynamically stable while bcc Re exhibits phonon instabilities in large parts of the Brillouin zone, similar to previous results for fcc W. Interestingly, the phonon dispersion curves for fcc Re show pronounced phonon anomalies characteristic of superconductors such as TaC and NbC. Due to the instabilities in bcc Re and fcc W the vibrational entropy, and therefore the free energy, is undefined. In order to predict the regions where the disordered Re x W 1Ϫx alloy is unstable we calculate the phonon dispersion curves in the virtual crystal approximation. Then we apply a concentration-dependent nonlinear interpolation to the force constants, which are calculated through a Born-von Kármán fit to the ab initio obtained dynamical matrices. The vibrational free energy is calculated in the stable regions for the phases as a function of concentration. The complete analysis gives a region where the bcc phase would become thermodynamically unstable towards a phase decomposition into disordered bcc and fcc phases.

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Enhanced Superconductivity by Electron Renormalization of a Directly Observed Brout-Visscher Local Phonon: Re inMo1−xRex

Cited by 18 publications

References 16 publications

On mossbauer dynamics in Nb3Sn

On mossbauer dynamics in Nb3Sn

Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy

Dynamical and thermodynamical instabilities in the disorderedRexW1−xsystem

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Enhanced Superconductivity by Electron Renormalization of a Directly Observed Brout-Visscher Local Phonon: Re inMo1−xRex

Cited by 18 publications

References 16 publications

On mossbauer dynamics in Nb3Sn

On mossbauer dynamics in Nb3Sn

Electronic structure of Mo1−xRexalloys studied through resonant photoemission spectroscopy

Dynamical and thermodynamical instabilities in the disorderedRexW1−xsystem

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Electronic structure of Mo_1−xRe_xalloys studied through resonant photoemission spectroscopy