Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of BaNi2As2

K. Kudo; M. Takasuga; Y. Okamoto; Z. Hiroi; M. Nohara

doi:10.1103/PhysRevLett.109.097002

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Giant Phonon Softening and Enhancement of Superconductivity by Phosphorus Doping of BaNi2As2

K. Kudo, M. Takasuga, Y. Okamoto, Z. Hiroi, M. Nohara

DOI 10.1103/PhysRevLett.109.097002 · Physical Review Letters

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Abstract

The effects of phosphorus doping on the structural and superconducting phase transitions of BaNi2(As1−xPx)2 were studied. The specific heat, resistivity, and magnetic susceptibility were measured. The results revealed an abrupt increase in the superconducting transition temperature (Tc) from 0.6 K in the triclinic phase (space group P1¯) with less phosphorus (x≤0.067) to 3.3 K in the tetragonal phase (space group I4/mmm) with more phosphorus (x≥0.067). Our data analysis suggests that a doping-induced softening related to an in-plane Ni and As(P) phonon mode is responsible for the enhanced superconductivity in the tetragonal phase.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
BaNi2(As1-xPx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.3	Pressure not reported	unknown
BaNi2(As1-xPx)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.6	Pressure not reported	unknown
BaNi2(As0.93P0.07)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.33	Pressure not reported	onset
BaNi2(As0.87P0.13)2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.24	Pressure not reported	unknown
BaNi2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.7	Pressure not reported	unknown
BaNi2P2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3	Pressure not reported	unknown
CaC6 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15.1	Pressure not reported	unknown