Thermodynamic properties of the clathrate-type silver-oxide Ag6O8AgHF2

Kawashima, Kenji; Kriener, Markus; Ishii, Masataka; Maeno, Y.; Akimitsu, Jun

doi:10.1016/j.physc.2008.01.008

Cited by 5 publications

(3 citation statements)

References 19 publications

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“…Our work shows that the superconducting character of the clathrate structure can be preserved and even enhanced despite local changes which may affect both the host and the guest structures. This robustness in the superconductivity of the clathrate structure could be related also to the observed superconductivity of Ag 6 O 8 AgHF 2 [59]. In fact, this is the only silver-containing compound in which superconductivity has been observed and its structure is clathrate based.…”

Section: Discussionmentioning

confidence: 69%

Enhanced high-pressure superconductivity and local structure of theBa8Si46clathrate

et al. 2016

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The high-pressure superconducting properties and the local structure of the Ba 8 Si 46 clathrate have been studied using electrical resistance and x-ray absorption spectroscopy measurements up to more than 20 GPa. At pressures above 10-13 GPa, corresponding to a well-known volume collapse phase transformation, a sudden increase in the critical temperature leads to a maximum value of the superconducting critical temperature T c of ∼8.5-9 K at 20 GPa. In the low-pressure clathrate phase, the superconducting critical temperature decreases as pressure is applied with an electron-phonon coupling constant λ = 1.1 derived from the temperature evolution of the electrical resistance at different pressures. A progressive disorder in the Ba-Si correlations in the Ba@Si 24 cages of the structure is observed for pressures beyond ∼5 GPa. These observations exclude a structural homothecy at the volume collapse transition. The high-pressure collapsed phase of Ba 8 Si 46 is then associated with local structural changes and shows enhanced superconducting properties.

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Section: Discussionmentioning

confidence: 69%

Enhanced high-pressure superconductivity and local structure of theBa8Si46clathrate

et al. 2016

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“…Although synthesizing these materials could prove to be difficult, a success here could start a whole new field of superconductivity (assuming that the doped holes do not localize) [87]. Now, there are oxides of silver which are low T c superconductors, such as Ag 7 O 8 HF 2 [88], but these clathrates' superconductivity likely originates from 'rattling' modes of HF 2 centered in the large Ag 6 O 8 cages of this material.…”

Section: D and 5d Elementsmentioning

confidence: 99%

Materials design for new superconductors

Norman

2016

Rep. Prog. Phys.

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Since the announcement in 2011 of the Materials Genome Initiative by the Obama administration, much attention has been given to the subject of materials design to accelerate the discovery of new materials that could have technological implications. Although having its biggest impact for more applied materials like batteries, there is increasing interest in applying these ideas to predict new superconductors. This is obviously a challenge, given that superconductivity is a many body phenomenon, with whole classes of known superconductors lacking a quantitative theory. Given this caveat, various efforts to formulate materials design principles for superconductors are reviewed here, with a focus on surveying the periodic table in an attempt to identify cuprate analogues.

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“…The T c 's of these materials are very low, the highest being 1.0 − 1.5 K for X − = NO − 3 and HF − 2 [9]. These materials are interesting for a couple of reasons.…”

mentioning

confidence: 99%

Gifts from the superconducting curiosity shop

Mandrus

2011

Front. Phys.

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Thermodynamic properties of the clathrate-type silver-oxide Ag6O8AgHF2

Cited by 5 publications

References 19 publications

Enhanced high-pressure superconductivity and local structure of theBa8Si46clathrate

Enhanced high-pressure superconductivity and local structure of theBa8Si46clathrate

Materials design for new superconductors

Gifts from the superconducting curiosity shop

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