Nuclear Ordering in Lithium and an Upper Limit on its Ambient Pressure Superconducting Transition Temperature

Juntunen, Kirsi; Tuoriniemi, Juha

doi:10.1103/physrevlett.93.157201

Cited by 20 publications

(17 citation statements)

References 20 publications

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“…On the other hand, other very recent experiments [6,7,8] have also shown that at this pressure range lithium presents a superconducting transition with T c ∼ 20K, becoming the highest transition temperature between simple elements [9]. It is noteworthy that experiments looking for superconductivity in lithium under ambient pressure have failed [10]. This even rises the interest to characterice the physical properties of compressed lithium close to the observed electronic and structural transitions.…”

Section: Introductionmentioning

confidence: 94%

Pressure induced complexity in a lithium monolayer:Ab initiocalculations

Rodríguez-Prieto

Bergara

2005

Phys. Rev. B

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Light alkali metals have usually been considered as simple metals due to their monovalency and high conductivity. In these metals ionic pseudopotentials are weak and the nearly free electron model (NFE) becomes quite accurate at normal conditions. However, very recent experiments have shown that at high pressures their electronic properties deviate radically from the NFE model and even become unexpected good superconductors. In this work we present ab initio calculations to analyze the deviation from simplicity in a lithium monolayer (ML) when pressure is applied. We have seen that as a result of the increasing non-local character of the atomic pseudopotential with increasing pressure, the surprising half filling Hubbard-type nesting observed in the Fermi line can explain the interesting complex behavior in lithium ML, induced by its correlated structural, electronic and even magnetic properties.

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Section: Introductionmentioning

confidence: 94%

Pressure induced complexity in a lithium monolayer:Ab initiocalculations

Rodríguez-Prieto

Bergara

2005

Phys. Rev. B

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“…For example, recent experiments have shown that lithium superconducts at around 15 K when the applied pressure rises to 30 GPa [5][6][7], becoming the highest transition temperature for simple elements [8]. Experiments looking for superconductivity in lithium under ambient pressure have failed [9], which increases the interest in characterizing the physical properties of compressed light elements even more. On the other hand, interest in hydrogen has never been low.…”

Section: Introductionmentioning

confidence: 99%

No evidence of metallic methane at high pressure

Martínez-Canales¹,

Bergara

2006

High Pressure Research

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Recently reported superconductivity in lithium under pressure has renewed the interest in hydrogen and hydrogen-rich systems in the long standing quest for room temperature superconductivity. As the required metallization of pure hydrogen cannot be achieved within current experimental capabilities, it has been suggested that the chemical precompression exerted by heavier atoms in compounds with a large hydrogen content should lower the required pressures to attain the metallic transition in these alloys. Following the trend of analyzing group IVa hydrides, we present an ab initio analysis of pressureinduced metallization of methane. According to our calculations, the metallization of methane is not predicted to occur below 520 GPa, which corresponds to a compression factor of 7.5.

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“…[2][3][4][5] According to a recent x-ray analysis 3) lithium undergoes a bcc to fcc transition at 7.5 GPa, followed by a fcc to hR1 at 39 GPa and a hR1 to cI16 at around 40 GPa. On the other hand, despite experiments looking for superconductivity in lithium at equilibrium have failed, 8) it has been observed to superconduct at 20 K when pressure rises to 40 GPa. 9) This surprising and intriguing correlation between complex structures and superconductivity have rosed the interest to characterize physical properties of compressed lithium.…”

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confidence: 99%

Nesting Induced Peierls-Type Instability for Compressed Li-cI16

2007

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Alkalies are considered to be simple metals at ambient conditions. However, recently reported theoretical and experimental results have shown an unexpected and intriguing correlation between complex structures and an enhanced superconducting transition temperature in lithium under pressure. In this article we analyze the pressure induced Fermi surface deformation in bcc lithium, and its relation to the observed cI16 structure. According to our calculations, the Fermi surface becomes increasingly anisotropic with pressure and develops an extended nesting along the bcc [121] direction. This nesting induces a phonon instability of both transverse modes at N , so that a Peierls-type mechanism is proposed to explain the stability of Li-cI16.

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Nuclear Ordering in Lithium and an Upper Limit on its Ambient Pressure Superconducting Transition Temperature

Cited by 20 publications

References 20 publications

Pressure induced complexity in a lithium monolayer:Ab initiocalculations

Pressure induced complexity in a lithium monolayer:Ab initiocalculations

No evidence of metallic methane at high pressure

Nesting Induced Peierls-Type Instability for Compressed Li-cI16

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