ESR in the Y1-x GdxBa2Cu3Oy system
Alekseevskii N. E. , Garifullin I. A. , Garif'yanov N. N. , Kochelaev B. I. , Mitin V. , Nizhankovskii V. I. , Tagirov L. R. , Khlybov E. P.
The ESR spectrum of Cu2+ and Gd3+ ions has been observed and identified in the superconducting system Yx _ x Gdx ÷Á2óÉ30^. The integral of the exchange interaction of Gd3+ ions with conduction electrons is found: Jsf — 7.4 X 10 ~3 eV. The energy gap is estimated to be 2k0/kB Tc~6.5. The integral of the exchange interaction between Gd3 + ions is estimated to øÅ/ÏΙ = 0.12 ë.