[1] I. A.Troyan, A. P.Drozdov, M. I.Eremets, S. I.Shylin, V.Ksenofontov. Conventional superconductivity at 203 kelvin at high pressures in the sulfur hydride system. Nature, 525, 73-76(2015).

[2] A. P.Drozdov et al. Superconductivity at 250 K in lanthanum hydride under high pressures. Nature, 569, 528-531(2019).

[3] M.Somayazulu et al. Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures. Phys. Rev. Lett., 122, 027001(2019).

[4] I. A.Troyan et al. Anomalous high-temperature superconductivity in YH₆. Adv. Mater., 33, 2006832(2021).

[5] P.Kong et al. Superconductivity up to 243 K in yttrium hydrides under high pressure. Nat. Commun., 12, 5075(2021).

[6] L.Ma et al. High-temperature superconducting phase in clathrate calcium hydride CaH₆ up to 215 K at a pressure of 172 GPa. Phys. Rev. Lett., 128, 167001(2022).

[7] C. L.Zhang et al. Superconductivity above 80 K in polyhydrides of hafnium.

[8] D. V.Semenok et al. Superconductivity at 253 K in lanthanum–yttrium ternary hydrides. Mater. Today, 48, 18-28(2021).

[9] D.Zhou et al. Superconducting praseodymium superhydrides. Sci. Adv., 6, eaax6849(2020).

[10] T.Matsuoka et al. Superconductivity of platinum hydride. Phys. Rev. B, 99, 144511(2019).

[11] F.Hong et al. Possible superconductivity at ∼70 K in tin hydride SnH_x under high pressure. Mater. Today Phys., 22, 100596(2022).

[12] A. R.Oganov, X.Huang, D. V.Semenok, H.Shu, X.Li, D.Duan, W.Chen, T.Cui. High-temperature superconducting phases in cerium superhydride with a T_c up to 115 K below a pressure of 1 Megabar. Phys. Rev. Lett., 127, 117001(2021).

[13] M.Sakata et al. Superconductivity of lanthanum hydride synthesized using AlH₃ as a hydrogen source. Supercond. Sci. Technol., 33, 114004(2020).

[14] W.Chen et al. Synthesis of molecular metallic barium superhydride: Pseudocubic BaH₁₂. Nat. Commun., 12, 273(2021).

[15] M. A.Kuzovnikov, M.Tkacz. High-pressure synthesis of novel polyhydrides of Zr and Hf with a Th₄H₁₅-type structure. J. Phys. Chem. C, 123, 30059-30066(2019).

[16] D. V.Semenok et al. Superconductivity at 161 K in thorium hydride ThH₁₀: Synthesis and properties. Mater. Today, 33, 36-44(2020).

[17] N. N.Wang et al. A low-T_c superconducting modification of Th₄H₁₅ synthesized under high pressure. Supercond. Sci. Technol., 34, 034006(2021).

[18] I. A.Troyan, A. P.Drozdov, M. I.Eremets. Superconductivity above 100 K in PH3 at high pressures.

[19] M.Shao et al. Superconducting ScH₃ and LuH₃ at megabar pressures. Inorg. Chem., 60, 15330(2021).

[20] J.Chen et al. Computational design of novel hydrogen-rich YS–H compounds. ACS Omega, 4, 14317-14323(2019).

[21] J. A.Alarco, P. C.Talbot, I. D. R.Mackinnon. Identification of superconductivity mechanisms and prediction of new materials using density functional theory (DFT) calculations. J. Phys.: Conf. Ser., 1143, 012028(2018).

[22] A. R.Oganov, A. G.Kvashnin, D. V.Semenok, I. A.Kruglov. Actinium hydrides AcH₁₀, AcH₁₂, and AcH₁₆ as high-temperature conventional superconductors. J. Phys. Chem. Lett., 9, 1920-1926(2018).

[23] I.Errea, M. I.Eremets, C. J.Pickard. Superconducting hydrides under pressure. Annu. Rev. Condens. Matter Phys., 11, 57-76(2020).

[24] M.Eremets, J. A.Flores-Livas, G.Profeta, A.Sanna, R.Arita, L.Boeri. A perspective on conventional high-temperature superconductors at high pressure: Methods and materials. Phys. Rep., 856, 1-78(2020).

[25] A.Goncharov. Phase diagram of hydrogen at extreme pressures and temperatures; updated through 2019 (Review article). Low Temp. Phys., 46, 97(2020).

[26] C.Ji, H.-K.Mao, E.Gregoryanz, P.Dalladay-Simpson, B.Li, R. T.Howie. Everything you always wanted to know about metallic hydrogen but were afraid to ask. Matter Radiat. Extremes, 5, 038101(2020).

[27] B.Lilia et al. The 2021 room-temperature superconductivity roadmap. J. Phys.: Condens. Matter, 34, 183002(2022).

[28] G.Yang, Y.Zhao, X.Zhang. Superconducting ternary hydrides under high pressure. Wiley Interdiscip. Rev.: Comput. Mol. Sci., 12, e1582(2021).

[29] M. L.Cohen, M.Dogan. Anomalous behaviour in high-pressure carbonaceous sulfur hydride. Physica C, 583, 1353851(2021).

[30] T.Wang et al. Absence of conventional room temperature superconductivity at high pressure in carbon doped H₃S. Phys. Rev. B, 104, 064510(2021).

[31] S.Mozaffari et al. Superconducting phase diagram of H₃S under high magnetic fields. Nat. Commun., 10, 2522(2019).

[32] V. B.Prakapenka, V. S.Minkov, M. I.Eremets, E.Greenberg. A boosted critical temperature of 166 K in superconducting D₃S synthesized from elemental sulfur and hydrogen. Angew. Chem., Int. Ed., 59, 18970-18974(2020).

[33] R.Matsumoto et al. Electrical transport measurements for superconducting sulfur hydrides using boron-doped diamond electrodes on beveled diamond anvil. Supercond. Sci. Technol., 33, 124005(2020).

[34] D.Laniel et al. Novel sulfur hydrides synthesized at extreme conditions. Phys. Rev. B, 102, 134109(2020).

[35] X.Huang et al. High-temperature superconductivity in sulfur hydride evidenced by alternating-current magnetic susceptibility. Natl. Sci. Rev., 6, 713-718(2019).

[36] L. D.Landau, V. L.Ginzburg. Z. Eksp. Teor. Fiz., 20, 1064(1950).

[37] X. J.Zhou et al. High-temperature superconductors: Universal nodal Fermi velocity. Nature, 423, 398(2003).

[38] D. K.Sunko. High-temperature superconductors as ionic metals. J. Supercond. Novel Magn., 33, 27-33(2020).

[39] D. R.Harshman, A. T.Fiory. High-T_c superconductivity in hydrogen clathrates mediated by Coulomb interactions between hydrogen and central-atom electrons. J. Supercond. Novel Magn., 33, 2945-2961(2020).

[40] A. T.Fiory, D. R.Harshman. The superconducting transition temperatures of C–S–H based on inter-sublattice S–H₄-tetrahedron electronic interactions. J. Appl. Phys., 131, 015105(2022).

[41] Y. J.Uemura. Bose-Einstein to BCS crossover picture for high-T_c cuprates. Physica C, 282-287, 194-197(1997).

[42] E. F.Talantsev. Comparison of highly-compressed C2/m-SnH₁₂ superhydride with conventional superconductors. J. Phys.: Condens. Matter, 33, 285601(2021).

[43] J. L.Tallon, W. P.Crump, E. F.Talantsev. Universal scaling of the self-field critical current in superconductors: From sub-nanometre to millimetre size. Sci. Rep., 7, 10010(2017).

[44] X.Zhao, D. N.Basov, R.Liang, G.Yu, N.Kaneko, S.Komiya, M.Strongin, T.Timusk, S. V.Dordevic, C. C.Homes, M.Greven, D. A.Bonn, W. N.Hardy, Y.Ando. A universal scaling relation in high-temperature superconductors. Nature, 430, 539-541(2004).

[45] M. R.Koblischka, A.Koblischka-Veneva. Calculation of T_c of superconducting elements with the Roeser–Huber formalism. Metals, 12, 337(2022).

[46] S.Mozaffari, D.Sun, P. P.Kong, S. I.Shylin, A. P.Drozdov, M. I.Eremets, V. S.Minkov, F. F.Balakirev, L.Balicas, S. L.Bud’ko, V.Ksenofontov, R.Prozorov. High-temperature superconductivity in hydrides: Experimental evidence and details. J. Supercond. Novel Magn., 35, 965-977(2022).

[47] O.Moulding, S.Cross, O.Lord, S.Friedemann, J.Buhot, T.Muramatsu, A.Brooks, I.Osmond, T.Fedotenko. Clean-limit superconductivity in Im3̄m H₃S synthesized from sulfur and hydrogen donor ammonia borane. Phys. Rev. B, 105, L220502(2022).

[48] D. V.Semenok et al. Effect of magnetic impurities on superconductivity in LaH₁₀. Adv. Mater.(2022).

[49] J. L.Tallon, E. F.Talantsev, W. P.Crump, J. G.Storey. London penetration depth and thermal fluctuations in the sulphur hydride 203 K superconductor. Ann. Phys., 529, 1600390(2017).

[50] R. J.Husband, V. S.Minkov, S. L.Bud’ko, S.Chariton, V. B.Prakapenka, H. P.Liermann, F. F.Balakirev, M. I.Eremets. Magnetic field screening in hydrogen-rich high-temperature superconductors. Nat. Commun., 13, 3194(2022).

[51] J.Bardeen, J. R.Schrieffer, L. N.Cooper. Theory of superconductivity. Phys. Rev., 108, 1175-1204(1957).

[52] E. F.Talantsev. Classifying superconductivity in compressed H₃S. Mod. Phys. Lett. B, 33, 1950195(2019).

[53] I.Errea et al. Quantum crystal structure in the 250-kelvin superconducting lanthanum hydride. Nature, 578, 66-69(2020).

[54] L.Boeri, S.di Cataldo, C.Heil, G. B.Bachelet. Superconductivity in sodalite-like yttrium hydride clathrates. Phys. Rev. B, 99, 220502(R)(2019).

[55] J. A.Camargo-Martínez et al. The higher superconducting transition temperature T_c and the functional derivative of T_c with α²F(ω) for electron–phonon superconductors. J. Phys.: Condens. Matter, 32, 505901(2020).

[56] H.Casimir, C. J.Gorter. On supraconductivity I. Physica, 1, 306-320(1934).

[57] C. K.Jones, B. S.Chandrasekhar, J. K.Hulm. Upper critical field of solid solution alloys of the transition elements. Rev. Mod. Phys., 36, 74(1964).

[58] L. P.Gor’kov. The critical supercooling field in superconductivity theory. Sov. Phys. JETP, 10, 593-599(1960).

[59] M.Eisterer, T.Baumgartner, C.Scheuerlein, L.Bottura, R.Flükiger, H. W.Weber. Effects of neutron irradiation on pinning force scaling in state-of-the-art Nb₃Sn wires. Supercond. Sci. Technol., 27, 015005(2014).

[60] D.Sun et al. High-temperature superconductivity on the verge of a structural instability in lanthanum superhydride. Nat. Commun., 12, 6863(2021).

[61] N. R.Werthamer, E.Helfand. Temperature and purity dependence of the superconducting critical field, H_c2. II. Phys. Rev., 147, 288-294(1966).

[62] P. C.Hohenberg, E.Helfand, N. R.Werthamer. Temperature and purity dependence of the superconducting critical field, H_c2. III. Electron spin and spin-orbit effects. Phys. Rev., 147, 295-302(1966).

[63] H.Ninomiya et al. Superconductivity in a scandium borocarbide with a layered crystal structure. Inorg. Chem., 58, 15629-15636(2019).

[64] H.Xie et al. Superconducting zirconium polyhydrides at moderate pressures. J. Phys. Chem. Lett., 11, 646-651(2020).

[65] W.Zhang et al. A new superconducting 3R-WS₂ phase at high pressure. J. Phys. Chem. Lett., 12, 3321-3327(2021).

[66] M.Scuderi et al. Nanoscale analysis of superconducting Fe(Se,Te) epitaxial thin films and relationship with pinning properties. Sci. Rep., 11, 20100(2021).

[67] K.Ma et al. Group-9 transition-metal suboxides adopting the filled-Ti₂Ni structure: A class of superconductors exhibiting exceptionally high upper critical fields. Chem. Mater., 33, 8722-8732(2021).

[68] M.Boubeche et al. Enhanced superconductivity with possible re-appearance of charge density wave states in polycrystalline Cu_1-xAg_xIr₂Te₄ alloys. J. Phys. Chem. Solids, 163, 110539(2022).

[69] E. F.Talantsev. Advanced McMillan’s equation and its application for the analysis of highly-compressed superconductors. Supercond. Sci. Technol., 33, 094009(2020).

[70] E. F.Talantsev. The electron–phonon coupling constant and the Debye temperature in polyhydrides of thorium, hexadeuteride of yttrium, and metallic hydrogen phase III. J. Appl. Phys., 130, 195901(2021).

[71] F.Gross et al. Anomalous temperature dependence of the magnetic field penetration depth in superconducting UBe₁₃. Z. Phys. B: Condens. Matter, 64, 175-188(1986).

[72] K.Andres, P. J.Hirschfeld, B. S.Chandrasekhar, F.Gro?-Alltag, D.Einzel. London field penetration in heavy fermion superconductors. Z. Phys. B: Condens. Matter, 82, 243-255(1991).

[73] E. F.Talantsev. In-plane p-wave coherence length in iron-based superconductors. Results Phys., 18, 103339(2020).

[74] C. B.Satterthwaite, I. L.Toepke. Superconductivity of hydrides and deuterides of thorium. Phys. Rev. Lett., 25, 741-743(1970).

[75] A. B.Migdal. Interaction between electrons and lattice vibrations in a normal metal. Sov. Phys. JETP, 7, 996-1001(1958).

[76] G. M.Eliashberg. Interactions between electrons and lattice vibrations in a superconductor. Sov. Phys. JETP, 11, 696-702(1960).

[77] F.Marsiglio. Eliashberg theory: A short review. Ann. Phys., 417, 168102(2020).

[78] C.Grimaldi, S.Str?ssler, L.Pietronero. Nonadiabatic superconductivity. I. Vertex corrections for the electron-phonon interactions. Phys. Rev. B, 52, 10516-10529(1995).

[79] C.Grimaldi, L.Pietronero, S.Str?ssler. Nonadiabatic superconductivity. II. Generalized Eliashberg equations beyond Migdal’s theorem. Phys. Rev. B, 52, 10530-10546(1995).

[80] C.Grimaldi, E.Cappelluti, L.Pietronero. Isotope effect on m* in high T_c materials due to the breakdown of Migdal’s theorem. Europhys. Lett., 42, 667(1998).

[81] S.Ciuchi, S.Str?ssler, E.Cappelluti, L.Pietronero, C.Grimaldi. High T_c superconductivity in MgB₂ by nonadiabatic pairing. Phys. Rev. Lett., 88, 117003(2002).

[82] L.Pietronero, L.Ortenzi, L.Boeri, E.Cappelluti. Conventional/unconventional superconductivity in high-pressure hydrides and beyond: Insights from theory and perspectives. Quantum Stud.: Math. Found., 5, 5-21(2018).

[83] F.Bloch. Zum elektrischen widerstandsgesetz bei tiefen temperaturen. Z. Phys., 59, 208-214(1930).

[84] F. J.Blatt. Physics of Electronic Conduction in Solids, 185-190(1968).

[85] E. F.Talantsev. Classifying hydrogen-rich superconductors. Mater. Res. Express, 6, 106002(2019).

[86] E. F.Talantsev. An approach to identifying unconventional superconductivity in highly-compressed superconductors. Supercond. Sci. Technol., 33, 124001(2020).

[87] E. F.Talantsev, R. C.Mataira. Classifying superconductivity in ThH-ThD superhydrides/superdeuterides. Mater. Res. Express, 7, 016003(2020).

[88] E. F.Talantsev. The electron-phonon coupling constant, Fermi temperature and unconventional superconductivity in the carbonaceous sulfur hydride 190 K superconductor. Supercond. Sci. Technol., 34, 034001(2021).

[89] M. I.Eremets, P. P.Kong, A. P.Drozdov. Metallization of hydrogen(2021).

[90] Y.Li, Y.Li, Y.Ma, H.Liu, J.Hao. The metallization and superconductivity of dense hydrogen sulfide. J. Chem. Phys., 140, 174712(2014).

[91] F.Tian, T.Cui, D.Li, Y.Liu, X.Huang, D.Duan, W.Tian, H.Yu, B.Liu, Z.Zhao. Pressure-induced metallization of dense (H₂S)₂H₂ with high-T_c superconductivity. Sci. Rep., 4, 6968(2014).

[92] Z.Li et al. Superconductivity above 200 K discovered in superhydrides of calcium. Nat. Commun., 13, 2863(2022).

[93] M.Zhou, X.Yang, K.Wang, G.Liu, L.Ma, X.Yu, Y.Wang, H.Wang, Y.Ma, Y.Zhao, Y.Xie, H.Liu. High-temperature superconducting phase in clathrate calcium hydride CaH₆ up to 215 K at a pressure of 172 GPa. Phys. Rev. Lett., 128, 167001(2022).

[94] J. S.Tse, Y.Ma, T.Iitaka, H.Wang, K.Tanaka. Superconductive sodalite-like clathrate calcium hydride at high pressures. Proc. Natl. Acad. Sci. U. S. A., 109, 6463-6466(2012).

[95] I.Goncharenko, M. I.Eremets, I. A.Trojan, J. S.Tse, M.Hanfland, M.Amboage, Y.Yao. Pressure-induced hydrogen-dominant metallic state in aluminum hydride. Phys. Rev. Lett., 100, 045504(2008).

[96] F.Belli, P.Hou, I.Errea, R.Bianco. Strong anharmonic and quantum effects in Pm3̄nAlH3 under high pressure: A first-principles study. Phys. Rev. B, 103, 134305(2021).

[97] N. W.Ashcroft. Metallic hydrogen: A high-temperature superconductor?. Phys. Rev. Lett., 21, 1748-1749(1968).

[98] V. L.Ginzburg. Superfluidity and superconductivity in the universe. J. Stat. Phys., 1, 3-24(1969).

[99] R. H.Caton, C. B.Satterthwaite, J. F.Miller. Low-temperature heat capacity of normal and superconducting thorium hydride and thorium deuteride. Phys. Rev. B, 14, 2795(1976).

[100] J.Hao, Y.Ma, Y.Li, Y.Li. The metallization and superconductivity of dense hydrogen sulphide(2014).

[101] C. W.Glass, A. R.Oganov. Crystal structure prediction using ab initio evolutionary techniques: Principles and applications. J. Chem. Phys., 124, 244704-244715(2006).

[102] A. R.Oganov, M.Valle, A. O.Lyakhov. How evolutionary crystal structure prediction works—And why. Acc. Chem. Res., 44, 227-237(2011).

[103] Q.Zhu, H. T.Stokes, A. R.Oganov, A. O.Lyakhov. New developments in evolutionary structure prediction algorithm USPEX. Comput. Phys. Commun., 184, 1172-1182(2013).

[104] T. A.Strobel, P.Ganesh, R. J.Hemley, P. R. C.Kent, M.Somayazulu. Novel cooperative interactions and structural ordering in H₂S–H₂. Phys. Rev. Lett., 107, 255503(2011).

[105] M. I.Eremets, I. A.Troyan, A. P.Drozdov. Conventional superconductivity at 190 K at high pressures(2014).

[106] R.Hoffmann, R. J.Hemley, N. W.Ashcroft, H.Liu, I. I.Naumov. Potential high-T_c superconducting lanthanum and yttrium hydrides at high pressure. Proc. Natl. Acad. Sci. U. S. A., 114, 6990-6995(2017).

[107] D. A.Knyazev, P. P.Kong, V. S.Minkov, A. P.Drozdov, M. I.Eremets, M. A.Kuzovnikov, S. P.Besedin. Superconductivity at 215 K in lanthanum hydride at high pressures(2018).

[108] M.Ahart, V. V.Struzhkin, Y.Meng, R. J.Hemley, M.Somayazulu, A. K.Mishra, Z. M.Geballe, M.Baldini. Evidence for superconductivity above 260 K in lanthanum superhydride at megabar pressures(2018).