Microscopic Origin of Random Singlet Behavior in B-site Disordered Spin-1/2 Perovskite BaCu_1/3Nb_2/3O_3 Revealed by EXAFS and Thermodynamics

Sagar Mahapatra, Francesco De Angelis, Martin Etter +5

We report a combined structural and thermodynamic study of the ABO${}_3$-type disordered perovskite BaCu${}_{1/3}$Nb${}_{2/3}$O${}_3$ (BCNO), whose B site is jointly occupied by Cu and Nb…