Magnetic interactions and magnon gap in the ferromagnetic superconductor RuSr2GdCu2O8
A. Fainstein, E. Winkler, A. Butera, J. Tallon
DOI 10.1103/PhysRevB.60.R12597 · Physical Review B
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Abstract
By means of X- and Q-band magnetic-resonance measurements we have investigated the magnetic interactions and derived the magnon gap in the ferromagnetic superconductor RuSr2GdCu2O8. Two microwave absorptions are observed: first, a paramagnetic resonance of the Gd3+ ions, and second, appearing below the Curie temperature (TCurie), a ferromagnetic resonance due to the ruthenium lattice. Located between the superconducting CuO2 planes, the Gd ions serve as intrinsic probes of the internal magnetic fields near the Cu sites. Below TCurie the Gd3+ signal shifts, evidencing the appearance of a homogeneous internal field, HRu−Gd∼600Oe. We show that HRu−Gd is due to a Ru-Gd ferromagnetic exchange interaction. The Ru ferromagnetic resonance indicates the existence of a magnon anisotropy gap ω/γ≳4600Oe. We estimate the out-of-plane and in-plane anisotropy fields to be, respectively, Hz∼110kOe and Hx∼200Oe.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 46 | Pressure not reported | onset |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | Pressure not reported | zero_resistance |
| GdBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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