Design and synthesis of clathrate LaB8 with superconductivity

Liang Ma; Xin Yang; Guangtao Liu; Hanyu Liu; Guochun Yang; Hui Wang; Jinqun Cai; Mi Zhou; Hongbo Wang

doi:10.1103/PhysRevB.104.174112

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Design and synthesis of clathrate LaB8 with superconductivity

Liang Ma, Xin Yang, Guangtao Liu, Hanyu Liu, Guochun Yang, Hui Wang, Jinqun Cai, Mi Zhou, Hongbo Wang

DOI 10.1103/PhysRevB.104.174112 · Physical Review B

T1

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Abstract

Boron-based clathrate materials, typically with three-dimensional networks of B atoms, have tunable properties through the substitution of guest atoms, but the tuning of B cages themselves has not yet been developed. By combining a crystal structural search with the laser-heated diamond anvil cell technique, we successfully synthesized a new B-based clathrate boride, LaB8, at ∼108GPa and ∼2100K. The novel structure has a B-richest cage, with 26 B atoms encapsulating a single La atom. LaB8 demonstrates phonon-mediated superconductivity with an estimated transition temperature of 14 K at ambient pressure, mainly originating from the electron-phonon coupling of B cage. The replacement of La with alkaline earth metals can remarkably elevate the transition temperature. This work creates a prototype platform for subsequent investigation on tunable electronic properties through the choice of captured atoms.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaB8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	Pressure unresolved	unknown
LaB8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.1	100 GPa	unknown
ScB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.39	Pressure not reported	unknown
YB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	4.7	Pressure not reported	unknown
ZrB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.8	Pressure not reported	unknown
LuB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.4	Pressure not reported	unknown
YH6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	227	Pressure not reported	unknown
YH9 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	243	Pressure not reported	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure not reported	unknown
LaB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.01	Pressure unresolved	unknown
LaB12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.01	Pressure unresolved	unknown