Multiband Superconductivity of Heavy Electrons in a TlNi2Se2 Single Crystal

Hangdong Wang; Chiheng Dong; Qianhui Mao; Rajwali Khan; Xi Zhou; Chenxia Li; Bin Chen; Jinhu Yang; Qiping Su; Minghu Fang

doi:10.1103/PhysRevLett.111.207001

Multiband Superconductivity of Heavy Electrons in a TlNi2Se2 Single Crystal

Hangdong Wang, Chiheng Dong, Qianhui Mao, Rajwali Khan, Xi Zhou, Chenxia Li, Bin Chen, Jinhu Yang, Qiping Su, Minghu Fang

DOI 10.1103/PhysRevLett.111.207001 · Physical Review Letters

T1

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Abstract

We have made the first observation of superconductivity in TlNi2Se2 at TC=3.7 K, and it appears to involve heavy electrons with an effective mass m*=(14–20)mb, as inferred from the normal-state electronic specific heat and the upper critical field, HC2(T). We found that the zero-field electronic specific-heat data, Ces(T) (0.5 K≤T<3.7 K) in the superconducting state can be fitted with a two-gap BCS model, indicating that TlNi2Se2 seems to be a multiband superconductor, which is consistent with the band calculation for the isostructural KNi2S2. It is also found that the electronic specific-heat coefficient in the mixed state γN(H) exhibits a H1/2 behavior, which is considered as a common feature of the d-wave superconductors. TlNi2Se2, as a d-electron system with heavy electron superconductivity, may be a bridge between cuprate- or iron-based and conventional heavy-fermion superconductors.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
TlNi2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.7	Pressure not reported	onset
TlNi2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.7	Pressure not reported	onset
TlNi2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	3.7	Pressure not reported	onset
KNi2S2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	unknown
KNi2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1	Pressure not reported	unknown
LaNiAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	2.75	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
SrNi2P2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.4	Pressure not reported	unknown
KNi2Se2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.8	Pressure not reported	unknown
KNi2S2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.46	Pressure not reported	unknown