High-temperature Superconductivity in compressed Solid Silane

Zhang, Huadi; Jin, Xilian; Lv, Yunzhou; Zhuang, Quan; Liu, Yunxian; Lv, Qianqian; Bao, Kuo; Li, Da; Liu, Bingbing; Cui, Tian

doi:10.1038/srep08845

Cited by 28 publications

(18 citation statements)

References 36 publications

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“…where Θ D is the Debye temperature, λ is the electron-phonon coupling strength, μ * is the Coulomb pseudopotential. MaMillan’s strong coupling theory defines an electron-phonon coupling constant (EPC) λ by 8 10 11 …”

Section: Resultsmentioning

confidence: 99%

Pressure dependence of electronic structure and superconductivity of the MnX (X = N, P, As, Sb)

Chong

Jiang

Zhou

et al. 2016

Sci Rep

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A recently experimental discovered (Cheng et al., Phys. Rev. Lett. 114, 117001 (2015)) of superconductivity on the border of long-range magnetic order in the itinerant-electron helimagnet MnP via the application of high pressure makes MnP the first Mn-based superconductor. In this paper, we carry out first-principles calculations on MnX (X = N, P, As, Sb) and find superconducting critical temperature TC of MnP sharply increases near the critical pressure PC ≈ 8 GPa, which is in good agreement with the experiments. Electron-phonon coupling constant λ and electronic density of states at the Fermi level N (EF) are found to increase with pressure for MnP, which lead to the increase of TC of MnP. Moreover, we also find that the TC of MnAs and MnSb are higher than MnP, implying that the MnAs and MnSb may be the more potential Mn-based superconducting materials.

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Section: Resultsmentioning

confidence: 99%

Pressure dependence of electronic structure and superconductivity of the MnX (X = N, P, As, Sb)

Chong

Jiang

Zhou

et al. 2016

Sci Rep

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“…[10][11][12][13][14][15][16][17][18] Experiments 13,16 show that SiH 4 has been metallic at 60 GPa and is a superconductor with a T c of 17 K at 96 GPa which are deemed as evidence of the idea, though debate remains. As the earliest and attractive group IV hydride, SiH 4 has experienced extensive theoretical and experimental efforts.…”

Section: Introductionmentioning

confidence: 99%

Investigation of stable germane structures under high-pressure

Zhang

Jin

et al. 2015

Phys. Chem. Chem. Phys.

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The evolutionary structure-searching method discovers that the energetically preferred compounds of germane can be synthesized at a pressure of 190 GPa. New structures with the space groups Ama2 and C2/c proposed here contain semimolecular H2 and V-type H3 units, respectively. Electronic structure analysis shows the metallic character and charge transfer from Ge to H. The conductivity of the two structures originates from the electrons around the hydrogen atoms. Further electron-phonon coupling calculations predict that the two phases are superconductors with a high Tc of 47-57 K for Ama2 at 250 GPa and 70-84 K for C2/c at 500 GPa from quasi-harmonic approximation calculations, which may be higher than under actual conditions.

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“…Since then, numerous theoretical studies have been performed that investigate the phase diagrams of hydrogen doped with the electropositive alkali metals or alkaline earth metals [20][21][22][23][24][25][26][27][28][29][30][31][32][33][34], as well as the electronegative element iodine [35,36] under pressure. Experimental work on the hydrides of lithium and sodium confirmed that species with unique stoichiometries such as NaH 3 and NaH 7 can be synthesized in diamond anvil cells, but the phases that have been reported to date do not exhibit superconductivity [21,37]. Nonetheless, as summarized in this short review, the aforementioned theoretical explorations have: revealed that rich structural variety may be found in the hydrogenic sublattices, suggested a number of ways that hydrogen may be metalized via doping, and shown that the propensity for superconductivity is linked to the nature of the hydrogenic motifs.…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, he hypothesized that these phases have the potential to be superconducting at high temperatures. Ashcroft's predictions led to a plethora of theoretical, and a few experimental, studies that searched for superconductivity in hydrides that are known to exist at at-mospheric conditions, such as SiH 4 [3][4][5][6][7][8][9][10], GeH 4 [11][12][13][14], and AlH 3 [15][16][17]. He also pointed out that a second component, which can be seen as an impurity, may potentially reduce the pressure required to metallize hydrogen [18].…”

Section: Introductionmentioning

confidence: 99%

Superconductivity in Hydrides Doped with Main Group Elements Under Pressure

Shamp¹,

Zurek²

2017

Novel Superconducting Materials

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A priori crystal structure prediction techniques have been used to explore the phase diagrams of hydrides of main group elements under pressure. A number of novel phases with the chemical formulas MHn, n > 1 and M = Li, Na, K, Rb, Cs; MHn, n > 2 and M= Mg, Ca, Sr, Ba; HnI with n > 1 and PH, PH 2 , PH 3 have been predicted to be stable at pressures achievable in diamond anvil cells. The hydrogenic lattices within these phases display a number of structural motifs including H δ− 2 , H − , H − 3 , as well as one-dimensional and three-dimensional extended structures. A wide range of superconducting critical temperatures, Tcs, are predicted for these hydrides. The mechanism of metallization and the propensity for superconductivity are dependent upon the structural motifs present in these phases, and in particular on their hydrogenic sublattices. Phases that are thermodynamically unstable, but dynamically stable, are accessible experimentally. The observed trends provide insight on how to design hydrides that are superconducting at high temperatures.

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High-temperature Superconductivity in compressed Solid Silane

Cited by 28 publications

References 36 publications

Pressure dependence of electronic structure and superconductivity of the MnX (X = N, P, As, Sb)

Pressure dependence of electronic structure and superconductivity of the MnX (X = N, P, As, Sb)

Investigation of stable germane structures under high-pressure

Superconductivity in Hydrides Doped with Main Group Elements Under Pressure

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