From antiferromagnetic order to static magnetic stripes: The phase diagramof (La,Eu)(2-x)SrxCuO4

The magnetic order of (La,Eu)(2-x)SrxCuO4 (x less than or equal to 0.2) has been investigated with mu SR techniques. In this system a low temperature tetragonal (LTT) structure is present in the entire range of doping and it is possible to follow the evolution from the long range antiferromagnetic s tate at I = 0 to the static magnetic stripes. We find a nonmonotonic change of the Neel temperature with increasing x and the obtained magnetic phase diagram of the LTT phase resembles the generic phase diagram of the cuprate s where the superconductivity is replaced by a second antiferromagnetic pha se.