EPR, magnetization, and resistivity studies in doped (4-<i>f</i> or 3-<i>d</i> ions) and undoped RBa2Cu3O<i>y</i> high <i>T</i> <i>C</i> superconductors (R=Y,Pr,Nd,Eu,Gd,Ho,Er, or Yb) (abstract)
Journal of applied physics