Superconducting H5S2 phase in sulfur-hydrogen system under high-pressure

Ishikawa, Takahiro; Nakanishi, Atsuko; Shimizu, Katsuya; Katayama‐Yoshida, Hiroshi; Oda, Tetsuji; Suzuki, N.

doi:10.1038/srep23160

Cited by 60 publications

(68 citation statements)

References 27 publications

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“…Theoretically, many stoichiometries and crystal structures have been predicted for this phase, primarily based on analysis of thermodynamic stability. The proposed chemical compositions for this phase include H 2 S, HS 2 , H 4 S 3 , H 5 S 2 , and the “Magnéli” phases; some of them are only stable at high pressures. The T c values in these phases were calculated by different groups, using essentially the same methodology based on Eliashberg formulism.…”

Section: Superconductivity In Hydrogen Sulfidementioning

confidence: 99%

Superconducting Hydrogen Sulfide

Yao

Tse

2018

Chemistry A European J

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The recent discovery of superconductivity above 200 K in hydrogen sulfide under high pressure marks a milestone in superconductor research. Not only does its critical temperature T exceed the previous record in cuprates by more than 50 K, the superconductivity in hydrogen sulfide also exhibits convincing evidence that it is of conventional phonon-mediated type. Moreover, this is the first time that a previously unknown high-T superconductor is predicted by theory and afterwards verified by experiment. In this Minireview, we survey the progress made in the last three years in understanding this novel material, and discuss unsolved problems and possible developments to encourage future investigations.

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Section: Superconductivity In Hydrogen Sulfidementioning

confidence: 99%

Superconducting Hydrogen Sulfide

Yao

Tse

2018

Chemistry A European J

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“…Instead, first-principles calculations have provided insights for the superconducting phases. It is now established that some of the observed values of T c with the low-and high-T schemes are well reproduced [9][10][11][12][13][14][15][16][17] with crystal structures predicted for compositions of H 2 S [9], as well as H 5 S 2 [16] and H 3 S [10] (See Fig. 1).…”

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confidence: 93%

Possible “Magnéli” Phases and Self-Alloying in the Superconducting Sulfur Hydride

et al. 2016

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We theoretically give an infinite number of metastable crystal structures for the superconducting sulfur hydride HxS under pressure. Previously predicted crystalline phases of H2S and H3S have been thought to have important roles for the experimentally observed low and high Tc, respectively. The newly found structures are long-period modulated crystals where slab-like H2S and H3S regions intergrow in a microscopic scale. The extremely small formation enthalpy for the H2S-H3S boundary indicated with the first-principles calculations suggests possible alloying of these phases through formation of local H3S regions. The modulated structures and gradual alloying transformations between them explain peculiar pressure dependence of Tc in sulfur hydride observed experimentally, as well as could they prevail in the experimental samples under various compression schemes.

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“…This result demonstrated that extreme pressures represent an avenue to access new physical phenomena and exotic states of matter, which in the next years may lead to many surprises. Sulfur hydride is not an isolated example of conventional high-T C superconductivity at high pressures [4][5][6][7][8][9][10][11][12][13], since a few months later also phosphine (PH 3 ) was observed to superconduct at transition temperatures as high as 100 K at 200 GPa [14]. In this case, experimental and theoretical evidences indicate that superconductivity most likely involves a metastable structure of phosphorus hydride, stabilized by a particular, reproducible experimental condition [15,16].…”

Section: Introductionmentioning

confidence: 99%

Interplay between structure and superconductivity: Metastable phases of phosphorus under pressure

Flores‐Livas

Sanna

Дроздов

et al. 2017

Phys. Rev. Materials

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Pressure-induced superconductivity and structural phase transitions in phosphorus (P) are studied by resistivity measurements under pressures up to 170 GPa and by fully ab initio crystal structure exploration and superconductivity calculations up to 350 GPa. Two distinct superconducting transition temperature (T C ) vs pressure (P ) trends at low pressure have been reported more than 30 years ago, and we are able to devise a consistent explanation founded on thermodynamically metastable phases of black phosphorus. Our experimental and theoretical results form a single, consistent picture which not only provides a clear understanding of elemental P under pressure but also sheds light on the longstanding and unsolved anomalous superconductivity trends. Moreover, at higher pressures we predict a similar scenario of multiple metastable structures which coexist beyond their thermodynamical stability range. We observe that all the metastable structures systematically exhibit larger transition temperatures than the ground-state structures, indicating that the exploration of metastable phases represents a promising route to design materials with improved superconducting properties.

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Superconducting H5S2 phase in sulfur-hydrogen system under high-pressure

Cited by 60 publications

References 27 publications

Superconducting Hydrogen Sulfide

Superconducting Hydrogen Sulfide

Possible “Magnéli” Phases and Self-Alloying in the Superconducting Sulfur Hydride

Interplay between structure and superconductivity: Metastable phases of phosphorus under pressure

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