Reversible effect of hydrogen on superconductivity and weak ferromagnetism in Eu{sub 1.4}Ce{sub 0.6}MSr{sub 2}Cu{sub 2}O{sub 10{minus}{delta}} (M=Nb and Ru)
- Racah Institute of Physics, The Hebrew University, Jerusalem, 91904 (Israel)
- Department of Physics, Ben-Gurion University, Beer-Sheva 84105 (Israel)
We have investigated the superconducting compounds Eu{sub 1.4}Ce{sub 0.6}MSr{sub 2}Cu{sub 2}O{sub 10{minus}{delta}} (M=Nb and Ru) (T{sub c}=22 and 32 K, respectively), as well as these materials charged with hydrogen, by several complementary experimental techniques. Eu{sub 1.4}Ce{sub 0.6}RuSr{sub 2}Cu{sub 2}O{sub 10{minus}{delta}} is magnetically ordered at T{sub N}=122K, thus T{sub N}{gt}T{sub c}. Superconductivity (SC) is confined to the CuO{sub 2} planes, and the magnetic ordering is due to the Ru sublattice. Among many interesting features, irreversibility phenomena at low magnetic fields and a magnetic spin reorientation transition, which are observed, originate from antisymmetric exchange coupling of the Dzyaloshinsky-Moria type. The effect of hydrogen (0.35 at.{percent}) is to suppress SC in both compounds and to enhance the weak-ferromagnetic properties of the Ru sublattice (T{sub N}=225K). In contrast to other high-T{sub c} materials, this effect is reversible: namely, by depletion of hydrogen, SC is restored in both materials and for M=Ru, the T{sub N} drops back to 122 K. {copyright} {ital 1998} {ital The American Physical Society}
- OSTI ID:
- 573794
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 57, Issue 1; Other Information: PBD: Jan 1998
- Country of Publication:
- United States
- Language:
- English
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