Magnetic ordering in the superconducting weak ferromagnets RuSr{sub 2}GdCu{sub 2}O{sub 8} and RuSr{sub 2}EuCu{sub 2}O{sub 8}
Neutron powder-diffraction measurements for RuSr{sub 2}GdCu{sub 2}O{sub 8} and RuSr{sub 2}EuCu{sub 2}O{sub 8} show that both compounds, below their magnetic ordering temperatures of 133 and 120 K, respectively, have the same G-type antiferromagnetic structure in which Ru moments are antiparallel in all three crystallographic directions. The ferromagnetism in these compounds, which is clearly indicated by hysteresis loops, can be explained if the Ru moments are canted to give a net moment perpendicular to the c axis. In such a model, one would expect an induced ferromagnetic ordering of the magnetic Gd ions, which have large ({approx}7{mu}{sub B}) moments, as a result of the net field at the Gd site, while Eu, being nonmagnetic, would exhibit no such response. The dramatically larger hysteresis loops for RuSr{sub 2}GdCu{sub 2}O{sub 8} compared to those for RuSr{sub 2}EuCu{sub 2}O{sub 8} are consistent with this hypothesis.
- Sponsoring Organization:
- (US)
- OSTI ID:
- 40205543
- Journal Information:
- Physical Review B, Vol. 63, Issue 5; Other Information: DOI: 10.1103/PhysRevB.63.054440; Othernumber: PRBMDO000063000005054440000001; 032105PRB; PBD: 1 Feb 2001; ISSN 0163-1829
- Publisher:
- The American Physical Society
- Country of Publication:
- United States
- Language:
- English
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