Reversible effect of hydrogen on superconductivity and weak ferromagnetism in Eu1.4Ce0.6MSr2Cu2O10−δ (M=Nb and Ru)
I. Felner, U. Asaf, S. D. Goren, C. Korn
DOI 10.1103/PhysRevB.57.550 · Physical Review B
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Abstract
We have investigated the superconducting compounds Eu1.4Ce0.6MSr2Cu2O10−δ (M=Nb and Ru) (Tc=22 and 32 K, respectively), as well as these materials charged with hydrogen, by several complementary experimental techniques. Eu1.4Ce0.6RuSr2Cu2O10−δ is magnetically ordered at TN=122K, thus TN≫Tc. Superconductivity (SC) is confined to the CuO2 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. %) is to suppress SC in both compounds and to enhance the weak-ferromagnetic properties of the Ru sublattice (TN=225K). In contrast to other high-Tc materials, this effect is reversible: namely, by depletion of hydrogen, SC is restored in both materials and for M=Ru, the TN drops back to 122 K.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Eu1.4Ce0.6NbSr2Cu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | unknown |
| Eu1.4Ce0.6RuSr2Cu2O10-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
| Eu1.4Ce0.6NbSr2Cu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 21 | Pressure not reported | onset |
| Eu1.4Ce0.6RuSr2Cu2O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 32 | Pressure not reported | unknown |
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