Superconductivity of Phosphorus and Phosphorus-Arsenic Alloy under High Pressures

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Abstract
The pressure-induced superconductivity in phosphorus was measured along the five different paths. The effect of pressure on the superconducting transition temperature(Tc) strongly depends on the path in a P-T phase diagram. When red phosphorus was pressurized at 4.2 K, the Tc raised up to 13 K at 30 GPa. This is the highest temperature in elements. Phosphorus-arsenic alloy with composition P1-x Asx (x: 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6) was prepared at high temperatures and pressures. The superconductivity and phase transition in the alloy have been studied. The Tc of the alloy was lower than that of black Phosphorus. The superconductivity in P1-x Asx is closely related to the pressure-induced phase transition.

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