Improvement of superconducting properties by high mixing entropy at blocking layers in BiS2-based superconductor REO0.5F0.5BiS2

Superconductivity in CuAl2-type Co0.2Ni0.1Cu0.1Rh0.3Ir0.3Zr2 with a high-entropy-alloy transition metal site

“…Recently, we reported the synthesis and superconducting properties of HEA-type layered superconductors [18,19]. In a BiS 2 -based layered superconductor system (REO 0.5 F 0.5 BiS 2 : RE = La, Ce, Pr, Nd, Sm), an increase in S mix improved the superconducting properties, owing to the suppression of local structural disorder [20,21]. Single crystal growth and the superconducting properties of HEA-type RE(O,F)BiS 2 have also been reported; superconducting properties comparable to low-entropy systems were confirmed [22].…”

Cutting Edge of High-Entropy Alloy Superconductors from the Perspective of Materials Research

“…REO 0.5 F 0.5 BiS 2 (RE: rare earth) is a BiS 2 -based layered superconductor with an REO blocking layer. In [44,45], samples with different mixing entropies at the blocking layer have been prepared (No. 6-1 in Table 4).…”

n-Type thermoelectric metal chalcogenide (Ag,Pb,Bi)(S,Se,Te) designed by multi-site-type high-entropy alloying

“…Most of HEA materials are structurally simple alloys with bcc, α-Mn, CsCl, and hcp crystal structures have mainly been studied so far [12][13][14]. Thus far, we have extended the concept of HEA to compounds, for instance layered structure and non-layered compounds of NaCl-type metal chalcogenide, as superconductors with high S mix [15][16][17][18][19][20][21][22]. Furthermore, as an efficient way to increase total entropy of mixing, we proposed multi-site alloying of compounds and its evaluation way by summing the entropy of mixing at each alloying site [20].…”