Magnetism, upper critical field and thermoelectric power of the magnetosuperconductor RuSr₂Eu_1.5Ce_0.5Cu₂O_10−δ

Abstract

Magnetic susceptibility, M-H plot, magnetoresistance and thermoelectric power of the RuSr 2 Eu 1.5 Ce 0.5 Cu 2 O 10-δ superconductor are measured. Values of the magnetic transition temperature T mag , superconductivity transition temperature T c , upper critical field H c2 , chemical potential µ, and energy width for electric conduction W σ are obtained from these measurements. It has been found that T mag = 140 K, T c = 25 K (33 K) from susceptibility (magnetoresistance) measurements, H c2 (0) > 32 T, µ = 8 meV, and W σ = 58.5 meV. These values are compared with other ruthenate superconductors, and resulting physical information is discussed.

Synthesis and physical characterization of superconductivity–magnetism crossover compound RuSr2EuCeCu2O10−δ

“…The S 300K value is around 63 µV/K, which is three times higher to that of superconducting RuSr 2 Eu 1.5 Ce 0.5 Cu 2 O 10-δ compound [18], which is same as the compared resistivity ratios discussed above.…”

“…Some of these features are described and corroborated separately [15]. [17,18]. The ρ (T) behavior of the compound is found to be semiconductor like, as expected for any other under-doped rutheno-cuprate system.…”

“…When compared directly with magnetosuperconducting composition of the same series i.e. RuSr 2 Eu/Gd 1.5 Ce 0.5 Cu 2 O 10-δ compounds [17,18], the magnetic ordering temperatures in terms of T AFM , T SG and T FM are found to be higher by around 20-30 K for the currently studied ground state nonsuperconducting RuSr 2 EuCeCu 2 O 10-δ compound. This is in agreement with an earlier report of ours on highly under-doped N 2 -annealed nonsuperconducting sample of composition RuSr 2 Gd 1.6 Ce 0.4 Cu 2 O 10-δ , which exhibited higher T mag in comparison to the superconducting rutheno-cuprates.…”

Experimental study of the magnetosuperconductorRuSr2Eu1.5Ce0.5Cu2Awana1, Lal2, Kishan3 et al. 2006Phys. Rev. B142110View full textAdd to dashboardCite

“…In the inset of this figure we show enlarged χ versus T plot for x=0.2 to show , in particular, branching of the field-cooled (FC) and zero-field-cooled (ZFC) curves near 135 K. Formally, the shapes of the field-cooled and zero-field-cooled curves of Fig. 3 for different values of x are similar to that for x = 0 [20]. The inset makes it clear for x=0.2.…”

X-ray photoelectron spectroscopy of superconductingRuSr2Eu1.5Ce0.5Cu2Manju1, Awana2, Kishan3 et al. 2006Phys. Rev. B15220View full textAdd to dashboardCite

“…The details of the synthesis procedures are described elsewhere. 7,8 Polycrystalline samples of Sr 2 RuO 4 were synthesized by the conventional ceramic route using stoichiometric quantities of high purity SrCO 3 and ruthenium oxide. They were thoroughly ground and the mixture was heated at 600°C for 24 h to avoid Ru evaporation, then at 930°C for 24 h, then at 1050°C for 24 h, and finally at 1200°C for 36 h with intermittent grindings.…”