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Lang, K. M.; Mizel, Ari; Mortara, J.L.; Hudson, Eric; Hone, James; Cohen, Marvin L.; Zettl, Alex; Davis, J. C.

doi:10.1023/a:1021854204812

Cited by 18 publications

(12 citation statements)

References 10 publications

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“…[16][17][18][19][20][21][22] For a long time, however, this prediction was not verified. 23,24 This puzzle has finally been resolved recently by a susceptibility measurement showing that solid Li at ambient pressure is weakly superconducting with T c Յ 0.4 mK. 25 The temperature-and pressure-induced phase transitions and superconductivity in high-pressure Li have been investigated experimentally.…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in lithium under high pressure investigated with density functional and Eliashberg theory

et al. 2009

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Structural phase transitions and superconducting properties in three phases ͑9R, fcc, and cI16͒ of solid Li are investigated using a pseudopotential plane-wave method based on density functional perturbation theory. In particular, it is shown that phonon softening is responsible for a pressure-induced fcc→ cI16 transition as well as for a significant enhancement of electron-phonon coupling and superconducting transition temperature T c preceding this structural transformation. The nature of superconductivity in the fcc and cI16 phases is examined by solving the Eliashberg equations with the spectral function ␣ 2 F͑͒ obtained from first-principles calculations and by evaluating the functional derivative ␦T c / ␦␣ 2 F͑͒. The calculated T c reaches a maximum at pressure close to the fcc→ cI16 transition and is significantly reduced in the cI16 phase, in agreement with the trend observed experimentally. The variation in T c as a function of pressure is explained in terms of the functional derivative and shifts of the spectral weight.

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Section: Introductionmentioning

confidence: 99%

Superconductivity in lithium under high pressure investigated with density functional and Eliashberg theory

et al. 2009

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“…Transformation from a simple nearly-free-electron metal not superconducting [6] above 100 µK to a strongly coupled electron-phonon superconductor at 20-50 GPa has been explained, at least semiquantitatively, in recent work by Profeta et al [7] and by Kasinathan et al [8]. The evolution of T c has been linked to the increase in electron-phonon coupling of specific phonon branches along intersections of Kohn anomaly surfaces with pressure.…”

Section: Introductionmentioning

confidence: 99%

Origin of strong coupling in lithium under pressure

Kasinathan

Koepernik

Kuneš

et al. 2007

Physica C: Superconductivity and its Applications

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In an attempt to provide a clearer understanding of the impressive increase in Tc under pressure in elemental Li, linear response calculation of the phonon dispersion curves, electron-phonon matrix elements, phonon linewidths and mode λ's have been carried out on a finer mesh (24 3 in the Brillouin zone) than done previously, for the volume corresponding to 20 GPa pressure. The result illustrates the great need for a fine mesh (even finer than this) for converged results of λ and the spectral function α 2 F . Although the initial pressure-induced transverse T1 phonon instability (in harmonic approximation) near the symmetry point K has dominated attention, the current results show that the high value of Tc gets strong contributions from elsewhere in the zone, particularly from the longitudinal mode along (100).

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“…In 1969 Allen and Cohen [6], based on their pseudopotential calculations, proposed Li to be superconducting but no evidence of superconductivity has been found at temperatures as low as 4 mK [7]. However, it was predicted that superconductivity should occur in Li under high pressure with transition temperatures of up to 80 K [8].…”

Section: Introductionmentioning

confidence: 99%

High Pressure Effects on Superconductivity

Lorenz

Chu

2005

Frontiers in Superconducting Materials

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The review is devoted to a discussion of the effects of high pressure imposed on superconducting materials. Low-temperature superconductors, high-temperature superconducting cuprates, and some unconventional superconducting compounds are investigated. Experimental as well as theoretical results regarding the pressure effects on Tc and other interesting properties are summarized.Comment: To be published in: "Frontiers in Superconducting Materials", Edt. A. Narlikar, Springer Verla

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Cited by 18 publications

References 10 publications

Superconductivity in lithium under high pressure investigated with density functional and Eliashberg theory

Superconductivity in lithium under high pressure investigated with density functional and Eliashberg theory

Origin of strong coupling in lithium under pressure

High Pressure Effects on Superconductivity

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