Pressure-stabilized hydrides are a new rapidly growing class of high-temperature superconductors, which is believed to be described within the conventional phonon-mediated mechanism of coupling. Here, the synthesis of one of the best-known high-T-C superconductors-yttrium hexahydride Im3 over bar m-YH6 is reported, which displays a superconducting transition at approximate to 224 K at 166 GPa. The extrapolated upper critical magnetic field B-c2(0) of YH6 is surprisingly high: 116-158 T, which is 2-2.5 times larger than the calculated value. A pronounced shift of T-C in yttrium deuteride YD6 with the isotope coefficient 0.4 supports the phonon-assisted superconductivity. Current-voltage measurements show that the critical current I-C and its density J(C) may exceed 1.75 A and 3500 A mm(-2) at 4 K, respectively, which is higher than that of the commercial superconductors, such as NbTi and YBCO. The results of superconducting density functional theory (SCDFT) and anharmonic calculations, together with anomalously high critical magnetic field, suggest notable departures of the superconducting properties from the conventional Migdal-Eliashberg and Bardeen-Cooper-Schrieffer theories, and presence of an additional mechanism of superconductivity.

Anomalous High-Temperature Superconductivity in YH6 / Troyan, Ia; Semenok, Dv; Kvashnin, Ag; Sadakov, Av; Sobolevskiy, Oa; Pudalov, Vm; Ivanova, Ag; Prakapenka, Vb; Greenberg, E; Gavriliuk, Ag; Lyubutin, Is; Struzhkin, Vv; Bergara, A; Errea, I; Bianco, R; Calandra, M; Mauri, F; Monacelli, L; Akashi, R; Oganov, Ar. - In: ADVANCED MATERIALS. - ISSN 0935-9648. - 33:15(2021), pp. 2006832-2006832. [10.1002/adma.202006832]

Anomalous High-Temperature Superconductivity in YH6

Bianco, R;
2021

Abstract

Pressure-stabilized hydrides are a new rapidly growing class of high-temperature superconductors, which is believed to be described within the conventional phonon-mediated mechanism of coupling. Here, the synthesis of one of the best-known high-T-C superconductors-yttrium hexahydride Im3 over bar m-YH6 is reported, which displays a superconducting transition at approximate to 224 K at 166 GPa. The extrapolated upper critical magnetic field B-c2(0) of YH6 is surprisingly high: 116-158 T, which is 2-2.5 times larger than the calculated value. A pronounced shift of T-C in yttrium deuteride YD6 with the isotope coefficient 0.4 supports the phonon-assisted superconductivity. Current-voltage measurements show that the critical current I-C and its density J(C) may exceed 1.75 A and 3500 A mm(-2) at 4 K, respectively, which is higher than that of the commercial superconductors, such as NbTi and YBCO. The results of superconducting density functional theory (SCDFT) and anharmonic calculations, together with anomalously high critical magnetic field, suggest notable departures of the superconducting properties from the conventional Migdal-Eliashberg and Bardeen-Cooper-Schrieffer theories, and presence of an additional mechanism of superconductivity.
2021
33
15
2006832
2006832
Anomalous High-Temperature Superconductivity in YH6 / Troyan, Ia; Semenok, Dv; Kvashnin, Ag; Sadakov, Av; Sobolevskiy, Oa; Pudalov, Vm; Ivanova, Ag; Prakapenka, Vb; Greenberg, E; Gavriliuk, Ag; Lyubutin, Is; Struzhkin, Vv; Bergara, A; Errea, I; Bianco, R; Calandra, M; Mauri, F; Monacelli, L; Akashi, R; Oganov, Ar. - In: ADVANCED MATERIALS. - ISSN 0935-9648. - 33:15(2021), pp. 2006832-2006832. [10.1002/adma.202006832]
Troyan, Ia; Semenok, Dv; Kvashnin, Ag; Sadakov, Av; Sobolevskiy, Oa; Pudalov, Vm; Ivanova, Ag; Prakapenka, Vb; Greenberg, E; Gavriliuk, Ag; Lyubutin, Is; Struzhkin, Vv; Bergara, A; Errea, I; Bianco, R; Calandra, M; Mauri, F; Monacelli, L; Akashi, R; Oganov, Ar
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

Licenza Creative Commons
I metadati presenti in IRIS UNIMORE sono rilasciati con licenza Creative Commons CC0 1.0 Universal, mentre i file delle pubblicazioni sono rilasciati con licenza Attribuzione 4.0 Internazionale (CC BY 4.0), salvo diversa indicazione.
In caso di violazione di copyright, contattare Supporto Iris

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/1299815
Citazioni
  • ???jsp.display-item.citation.pmc??? 20
  • Scopus 204
  • ???jsp.display-item.citation.isi??? 191
social impact