Magnetic interactions and magnon gap in the ferromagnetic superconductor RuSr2GdCu2O8

被引：110

作者：

Fainstein, A ^{[1
]}

Winkler, E

Butera, A

Tallon, JL

机构：

[1] Comis Nacl Energia Atom, Ctr Atom Bariloche, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina

[2] Ind Res Ltd, Lower Hutt, New Zealand

[3] Consejo Nacl Invest Cient & Tecn, RA-1033 Buenos Aires, DF, Argentina

来源：

PHYSICAL REVIEW B | 1999年 / 60卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.60.R12597

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

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 (T-Curie), 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 T-Curie the Gd3+ signal shifts, evidencing the appearance of a homogeneous internal field, HRu-Gd similar to 600 Oe. 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 w/gamma greater than or similar to 4600 Oe. We estimate the out-of-plane and in-plane anisotropy fields to be, respectively, H-z similar to 110 kOe and H-x similar to 200 Oe. [S0163-1829(99)50242-7].

引用

页码：12597 / 12600

页数：4

共 15 条

[1] Coexistence of ferromagnetism and superconductivity in the hybrid ruthenate-cuprate compound RuSr2GdCu2O8 studied by muon spin rotation and dc magnetization [J].