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Coexistence of magnetism and superconductivity in R1.4Ce0.6RuSr2Cu2O10 − δ(R = Eu, Sm and Gd)

✍ Scribed by I. Felner; U. Asaf

Publisher
Elsevier Science
Year
1998
Tongue
English
Weight
109 KB
Volume
24
Category
Article
ISSN
0749-6036

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✦ Synopsis

The superconducting R 1.4 Ce 0.6 RuSr 2 Cu 2 O 10-δ (R = Sm, Eu and Gd) with T c ∼ 28, 32 and 42 K are also magnetically ordered at T N ∼ 220, 122 and 180 K, respectively, thus, T N T c . This is in contrast to intermetallic magnetic superconductors (such as RNi 2 B 2 C) in which T c > T N . Magnetic susceptibility and Mossbauer spectroscopy show that superconductivity is confined to the CuO 2 planes, whereas magnetism is due to the Ru sublattice. Irreversibility phenomena and magnetic anomalies, observed at low magnetic fields originate from antisymmetric exchange coupling of the Dzyaloshinsky-Moria type, and from spin reorientation of the Ru moments. The shielding fraction is about 100%, supporting the conclusion that the materials consist of a single phase, manifesting both magnetism and superconductivity at once.

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