Magnetic resonance of Cu and of Gd in insulating GdSr2Cu2NbO8 and in superconducting GdSr2Cu2RuO8
J. D. Dow, H. A. Blackstead+, Z. F. Ren*, D. Z. Wang*
Department of Physics, Arizona State University, Tempe, Arizona 85287-1504 U.S.A.
+Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556 U.S.A.
*Physics Department, Boston College, Chestnut Hill, MA 02167 U.S.A.
PACS: 74.25.Jb, 74.25.Nf, 74.72.-h
Abstract
Weak-ferromagnetic (or anti-ferromagnetic)
resonance of Cu and electron spin
resonance (ESR) of Gd are observed both in
insulating
GdSr2Cu2NbO8 and in superconducting
GdSr2Cu2RuO8.
The Cu resonance implies that the
CuO2 planes are magnetic and indicates that the
superconducting layer of GdSr2Cu2RuO8 is SrO (not CuO2),
as in its related superconducting compound without
cuprate-planes, doped Sr2YRuO6.