High-Pressure Effects on the Superconducting Transition Temperature of Aluminum

Gubser, D. U.; Webb, A. W.

doi:10.1103/physrevlett.35.104

Cited by 59 publications

(38 citation statements)

References 13 publications

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“…The reason for this is that the pressure-induced changes in the lattice vibrations dominate over those in the electronic system, leading to a decrease in T c as the lattice stiffens under pressure. In such simple-metal systems it is an interesting physics question to explore the manner in which T c approaches 0 K as the pressure in increased; pioneering studies in this direction were carried out in the 1970's by Gubser and Webb [3] on superconducting Al by combining diamond-anvil cell, dilution refrigeration, and SQUID detection technology [4]. Such high-pressure investigations at mK and sub-mK temperatures, however, are extraordinarily difficult and require that the materials studied be highly purified to contain only trace concentrations of magnetic impurities.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced superconductivity in Sc to74GPa

Hamlin

Schilling

2007

Phys. Rev. B

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Using a diamond anvil cell with nearly hydrostatic helium pressure medium we have significantly extended the superconducting phase diagram T c (P ) of Sc, the lightest of all transition metals. We find that superconductivity is induced in Sc under pressure, T c increasing monotonically to 8.2 K at 74.2 GPa. The T c (P ) dependences of the trivalent d-electron metals Sc, Y, La, and Lu are compared and discussed within a simple s → d charge transfer framework.

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Section: Introductionmentioning

confidence: 99%

Pressure-induced superconductivity in Sc to74GPa

Hamlin

Schilling

2007

Phys. Rev. B

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“…36,37 It was argued that the pressure dependence of µ * makes a significant contribution to the behavior of T c under very high pressures and must be handled carefully. 32,38,39 In this paper we discuss the pressure dependences of some interested superconducting properties in MgB 2 . The outline of this paper is as follows: In Sec.…”

Section: Introductionmentioning

confidence: 99%

Effects of pressure on the superconducting properties of magnesium diboride

2002

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We discuss the effects of hydrostatic pressure on the superconducting properties of MgB2 within the framework of Eliashberg theory. By considering the pressure dependences of all parameters appearing in the McMillan formula, we show that the calculated pressure derivative of Tc as well as the variation of Tc with pressure are in good agreement with recent measurements. The pressure dependences of the energy gap ∆0, the effective interaction strength N (EF )v, the critical magnetic field Hc(0), and the electronic specific heat coefficient γ are also predicted for this system. A comparison of pressure effect in non-transition elements clearly suggests that MgB2 is an electronphonon mediated superconductor.

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“…It also has been shown that the phonon-mediated properties, including the electrical resistivity and the superconducting transition temperature, can be altered under pressure (11-13). It has been suggested that the electrical transport properties due to the electron-phonon interaction in aluminum show a particularly strong response to interatomic spacing, particularly when the system is subject to extreme quantum confinement (14,15).Studies of the effect of pressure on the superconducting properties of aluminum suggest that superconductivity is suppressed through a reduction in the critical temperature, T c , as the pressure is increased (11,12,(16)(17)(18). It also has been reported that the electron-phonon coupling constant, λ, decreases in aluminum under pressure (11,16), but a quantitative extension to the electrical resistivity under pressure is lacking.…”

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confidence: 99%

“…Studies of the effect of pressure on the superconducting properties of aluminum suggest that superconductivity is suppressed through a reduction in the critical temperature, T c , as the pressure is increased (11,12,(16)(17)(18). It also has been reported that the electron-phonon coupling constant, λ, decreases in aluminum under pressure (11,16), but a quantitative extension to the electrical resistivity under pressure is lacking.…”

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confidence: 99%

Pressure-enabled phonon engineering in metals

Lanzillo

Thomas

Watson

et al. 2014

Proc. Natl. Acad. Sci. U.S.A.

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We present a combined first-principles and experimental study of the electrical resistivity in aluminum and copper samples under pressures up to 2 GPa. The calculations are based on first-principles density functional perturbation theory, whereas the experimental setup uses a solid media piston-cylinder apparatus at room temperature. We find that upon pressurizing each metal, the phonon spectra are blue-shifted and the net electron-phonon interaction is suppressed relative to the unstrained crystal. This reduction in electron-phonon scattering results in a decrease in the electrical resistivity under pressure, which is more pronounced for aluminum than for copper. We show that density functional perturbation theory can be used to accurately predict the pressure response of the electrical resistivity in these metals. This work demonstrates how the phonon spectra in metals can be engineered through pressure to achieve more attractive electrical properties.density functional theory | electron-phonon coupling | high-pressure conductivity S train has proven to be an effective means of modifying the electronic structure in semiconducting materials, particularly band gap modulation in metal-oxide-semiconductor field-effect transistors (1-6). Strain also affects the phonon structure and transport properties of metals, which have no band gap to modulate, and may be used to engineer more attractive electrical properties at both the macroscale and the nanoscale.The nonzero electrical resistivity of a metal has two main contributions: the presence of defects and the vibrations of the lattice atoms about their equilibrium sites (7). Scattering events between electrons and vibrational quanta (phonons) give rise to the finite electrical resistivity in pure samples. First-principles calculations have proven to be remarkably successful in giving accurate descriptions of the phonon-induced electrical resistivity in metals (8-10). It also has been shown that the phonon-mediated properties, including the electrical resistivity and the superconducting transition temperature, can be altered under pressure (11-13). It has been suggested that the electrical transport properties due to the electron-phonon interaction in aluminum show a particularly strong response to interatomic spacing, particularly when the system is subject to extreme quantum confinement (14,15).Studies of the effect of pressure on the superconducting properties of aluminum suggest that superconductivity is suppressed through a reduction in the critical temperature, T c , as the pressure is increased (11,12,(16)(17)(18). It also has been reported that the electron-phonon coupling constant, λ, decreases in aluminum under pressure (11,16), but a quantitative extension to the electrical resistivity under pressure is lacking. Cheung and Ashcroft (13) suggested a decrease in the electrical resistivity of aluminum under volume compression by using a primitive pseudopotential model with experimentally determined interatomic force constants, but the pressures corresponding t...

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High-Pressure Effects on the Superconducting Transition Temperature of Aluminum

Cited by 59 publications

References 13 publications

Pressure-induced superconductivity in Sc to74GPa

Pressure-induced superconductivity in Sc to74GPa

Effects of pressure on the superconducting properties of magnesium diboride

Pressure-enabled phonon engineering in metals

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