Efficient route to achieve superconductivity improvement via substitutional La-Ce alloy superhydride at high pressure

Granular Superconductivity in Hydrides Under Pressure

“…These proper-ties would provide evidence that the materials trap magnetic flux and hence that persistent currents can flow in hydrides under pressure without dissipation, thus proving that the materials are indeed superconductors, disproving suggestions to the contrary [14,19,22,23,55]. No such hysteretic behavior in transport properties has been reported to date to our knowledge, for any of the more than 15 different hydrides under pressure claimed to be high temperature superconductors, for which extensive transport measurements have been reported [5][6][7][8][9]. We suggest that these experiments should be urgently performed.…”

“…Large drops [1] (and sometimes small drops [2,3]) in resistance are readily interpreted as indicating superconductivity, particularly when it is expected that the material should be a high temperature superconductor due to an earlier theoretical prediction [4]. In that way, more than 15 different hydrides under pressure have been claimed to be high temperature superconductors in recent years [5][6][7][8][9].…”

High-$T\rm_{c}$ superconductivity of clathrate Y$_{3}$EuH$_{24}$

“…A more recent report [32] has suggested stable high-T c ternary hydrides YCeH 20 and LaCeH 20 motivated by the properties of parent binaries CeH 9 , YH 9 and LaH 10 , CeH 10 respectively. Meanwhile, La-Ce-H based ternary hydride (La, Ce)H 9 has just been experimentally realized to show excellent stability against their binary phases, it was also found to exhibit a dramatic increase in superconducting temperature by 50-80 K compared to the binary CeH 9 [33]. Furthermore, a successful synthesis of ternary hydrides (La,Y)H 6 and (La, Y)H 10 with a maximum T c of ∼253 K at 183 GPa [34] has been established recently inspired by the theoretical work of Song et al [35] on La-Y-H ternary hydrides.…”

“…A very simple widely accepted method [33] to hypothesize new ternary hydride (A x B y H z ) using binary compound (A x+y H z ) is the random substitution of one of the metal atom in the binary with another atom having comparable chemical properties. The resulting stability and the superconducting properties of the new ternary hydride obtained from the mixture of two binaries can be associated to the similar structural and chemical properties of the metals involved in the formation of parent binaries.…”

“…In this work we have exploited the similar synthesis condition of YH 6 and EuH 6 binary hydrides to speculate the possibility of novel ternary superhydrides (Y-Eu-H) over a range of pressure 150-300 GPa. Additionally, Y and Eu have quite close atomic radius 212 pm, 231 pm and electronegativity of 1.22, 1.20 on the Pauling scale, respectively, which ensures the stability of ternary lattice [44,45,33].…”