Fluctuations of various order parameters in cuprate and Fe-based superconductors as revealed by microwave absorption measurements

Abstract

) Fluctuations of various order parameters are considered as the significant components of understanding the mechanism of high-T c superconductivity. To study these fluctuations in the cuprate and Fe-based superconductors we use the joint measurements of direct current resistivity and non-resonant microwave absorption. Comparing data obtained with both methods allowed us to extract the contribution of dynamic charge density waves in La 2 − x Sr x CuO 4 , superconducting fluctuations in Bi 2 Sr 2 Ca 1 − x Y x Cu 2 O 8 and nematic fluctuations in FeTe 1 − x Se x .