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We synthesized a new high-entropy-alloy-type (HEA-type) superconductor(Fe,Co,Ni,Cu,Ga)Zr2 with a Tc of 2.9 K. The EDX analyses revealed that theactual composition of the transition-metal site (Tr-site) is Tr =Fe0.18Co0.18Ni0.16Cu0.25Ga0.23, which gives the configurational entropy ofmixing {\Delta}Smix = 1.60R for the Tr site. Neutron powder diffractionrevealed that the sample has a tetragonal CuAl2-type (space group: #140). Thelattice constant of a monotonically decreases with decreasing temperature, butthe lattice constant of c does not exhibit a clear shrinkage. Isotropicdisplacement parameter for both the Tr and Zr sites are large, which isprobably caused by the HEA-type Tr site. The small temperature dependences ofUiso for both sites also indicate the presence of the local structural disorderin (Fe,Co,Ni,Cu,Ga)Zr2. From electrical resistivity, magnetic susceptibility,and specific heat measurements, bulk superconductivity was confirmed.

Superconductivity of high-entropy-alloy-type transition-metal zirconide (Fe,Co,Ni,Cu,Ga)Zr2