Superconductivity and magnetic order in super-oxygenated La2MCu2O6+δ (M=Ca,Sr)
✍ Scribed by E.J. Ansaldo; C. Niedermayer; H. Glückler; C.E. Stronach; T.M. Riseman; R.S. Cary; D.R. Noakes; X. Obradors; A. Fuertes; J.M. Navarro; P. Gomez; N. Casañ; B. Martinez; F. Perez; J. Rodriguez-Carvajal; K. Chow
- Publisher
- Elsevier Science
- Year
- 1991
- Tongue
- English
- Weight
- 175 KB
- Volume
- 185-189
- Category
- Article
- ISSN
- 0921-4534
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We present magnetic and specific heat measurements of the series Sr2RuCeo.sMCu201o\_a (R = Pr, Nd, Sm, Eu, Gd; M = Nb, Ta). Superconductivity occurs for y > 0.8 (R = Nd, Sm, Eu), however, for Gd only in combination with M = Nb, while the corresponding Pr compounds are found to be nonsuperconducting.
Samples of Y, \_XCa$r,GaCuZO,\_s (x=0,0.4), prepared under various oxygen pressures, have been studied by magnetometry. Samples doped with s'Fe have been studied also by Miissbauer spectroscopy. The majority of the iron ions (Fe3+ ) enters the Ga (Cu( 1) ) site, a minority enters the Cu(2) site. For