Pressure-induced superconductivity in LaP2 with a graphenelike phosphorus layer

Mingxin Zhang; Cuiying Pei; Bangshuai Zhu; Qi Wang; Juefei Wu; Yanpeng Qi

doi:10.1103/t445-8hck

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Pressure-induced superconductivity in LaP2 with a graphenelike phosphorus layer

Mingxin Zhang, Cuiying Pei, Bangshuai Zhu, Qi Wang, Juefei Wu, Yanpeng Qi

DOI 10.1103/t445-8hck · Physical Review B

T1

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Abstract

Materials with graphenelike layers attract tremendous attention due to their electronic structures and superconducting properties. In this study, we synthesized LaP2 polycrystalline and observed a superconducting transition at around 30 GPa. The critical temperature Tc increases monotonically with pressure, which is nearing saturation and reaches 7.8 K at 78 GPa. The synchrotron x-ray diffraction experiments confirm the superconducting transition originates from a structure transition to the P6/mmm phase under high pressure, suggesting the observation of graphenelike phosphorus layers in transition-metal phosphides. By first-principles calculations, we provide more evidence for the stability of the graphenelike phosphorus layers in LaP2. Our findings are helpful for the understanding of the LaP2 phase diagram under high pressure and could shed light on the research of unique structures in transition-metal phosphides under high pressure.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
LaP2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	7.8	78 GPa	onset
LaP2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	19.9	16 GPa	unknown
MgB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	39	Pressure unresolved	unknown
MoB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	32	109 GPa	unknown
WB2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	17	91 GPa	unknown
CaSi2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	14	12 GPa	unknown
MnP Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	8 GPa	unknown
Mo3P Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	5.5	Pressure not reported	unknown
Nb2P5 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.6	Pressure not reported	unknown