title: Spin dynamics in the pressure-induced two-leg ladder cuprate superconductor Sr(14-x)Ca(x)Cu(24)O(41).
abstract: Within the two-leg t-J ladder, the spin dynamics of the pressure-induced two-leg ladder cuprate superconductor Sr(14-x)Ca(x)Cu(24)O(41). is studied based on the kinetic energy driven superconducting mechanism. It is shown that in the pressure-induced superconducting state, the incommensurate spin correlation appears in the underpressure regime, while the commensurate spin fluctuation emerges in the optimal pressure and overpressure regimes. In particular, the spin-lattice relaxation time is dominated by a temperature linear dependence term at low temperature followed by a peak developed below the superconducting transition temperature, in qualitative agreement with the experimental observation on Sr(14-x)Ca(x)Cu(24)O(41)..
authors.affiliation: Department of Physics, University of Science and Technology Beijing, Beijing 100083,People's Republic of China.
authors.forename: Jihong
authors.initials: J
authors.lastname: Qin
authors.forename: Yu
authors.initials: Y
authors.lastname: Lan
authors.forename: Shiping
authors.initials: S
authors.lastname: Feng