K. Tagaya et al., MICROWAVE MAGNETOABSORPTIONS OF ERBA2CU3OY AND HOBA2CU3OY SINGLE-CRYSTALS, Physica. C, Superconductivity, 269(3-4), 1996, pp. 339-342
Microwave magnetoabsorption measurements were performed for single cry
stals of ErBa2Cu3Oy and HoBa2Cu3Oy in a temperature range from 3 to 80
K. Microwave magnetoabsorptions due to superconductivity were observe
d, and the principal values of the lower critical field were determine
d as 140 or 150 +/- 10 Oe and 430 +/- 10 Oe at 5 K for the ab-plane an
d the c-axis, respectively. Their temperature variations were investig
ated. Further, ESR signals of Er2BaCuO5 and Ho2BaCuO5 were observed, a
nd their superparamagnetic properties were investigated.