NORMAL-STATE PHASE-DIAGRAM OF (LA,SR)(2)CUO4 FROM CHARGE AND SPIN DYNAMICS

The significant progress in elucidating the normal state of the protot ypical cuprate La2-xSrxCuO4 is described. New insight is gained from q uantitative charge dynamics studies (resistivity, Hall effect) over wi de temperature and hole concentration ranges. Characteristic temperatu res T have been discovered and corresponding T*'s can also be identif ied in the magnetic response. At lowest carrier concentrations, T's s tart out high (700K-800K) and drop rapidly to similar to 100K when sup erconductivity disappears at high doping levels. From comparisons with other compounds, we suggest that the T marks the development of a ps eudogap in the excitation spectrum and we present a T-x diagram for L SCO, which we suggest is generic to all hole doped layered cuprates.