Superconductivity in the electrochemically Li-intercalated niobates with the layered perovskite structure

Abstract

Li-intercalated layered perovskites LixAB2Nan−3NbnO3n+1 (A=K, Rb, Cs; B=Ca, Sr, Ba) with n=3 and 4 have been prepared by an electrochemical technique. For the LixAB2Nb3O10 superconducting materials, the value of Tc has been found to increase up to about 5–6 K as the a-axis length increases. For LixCsBa2Nb3O10 with the largest a-axis length, however, superconductivity does not appear. In addtion, LixKCa2NaNb4O13 shows no superconductivity.