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ELECTRONIC PHASE DIAGRAM OF <font>La</font><sub>1.875</sub><font>Ba</font><sub>0.125-x</sub><font>Sr</font><sub>X</sub><font>CuO</font><sub>4</sub>
We performed systematic measurements of magnetic susceptibility on single crystals of La 1.875 Ba 0.125-x Sr x CuO 4 . The dependence of the superconducting transition temperature on Sr-concentration demonstrates a step-like pattern upon doping at x~0.08 as the crystal structure changes from low-temperature tetragonal (LTT) to low-temperature orthorhombic (LTO) …