American Physical Society, Physical Review Letters, 24(83), p. 5142-5145
DOI: 10.1103/physrevlett.83.5142
Full text: Unavailable
We have observed a huge oxygen isotope effect on the spin glass transition in La2-xSrxCu1-zMnzO4 ( x = 0.03 and 0.05, z = 0.02) using the muon-spin-rotation technique. Upon replacing 16O with 18O, the spin glass freezing temperature Tg in the Mn-doped samples increases by about 80% for x = 0.03 and 30% for x = 0.05. On the other hand, Tg has a small isotope shift in the Mn-free samples. These novel isotope effects clearly demonstrate a strong effect of electron-phonon interaction on magnetism which can be explained taking into account the polaronic nature of charge carriers in cuprates.