Dive into the research topics of 'Paramagnetic resonance of Cu<sup>2+</sup> defects in mixed n = 2 and n = 3 phase Bi<sub>1.5</sub>Pb<sub>0.5</sub>Sr<sub>2</sub>Ca<sub>n-1</sub>Cu<sub>n</sub>O<sub>2n+4</sub> superconductor'. Together they form a unique fingerprint.