Abstract
Strontium ruthenates have many similarities with copper oxide superconductors and are of particular interest for the investigation of the mechanisms and conditions which lead to high-temperature superconductivity. We report here on multiple experimental indications of superconductivity with onset at 40 K in strontium ruthenate doped by rhenium and selenium with chlorine used as the flux. The main experimental evidence arises from terahertz spectroscopy of this material followed by AC and DC magnetization, as well as measurements of its heat capacity and magnetoresistance. Structural and morphological studies revealed the heterophase nature of this polycrystalline material as well as the changes of lattice parameters relative to the original phases. Experimental data show a higher critical temperature on the surface compared to that of the bulk of the sample.
Highlights
The fascinating properties of strontium ruthenates Srn+1RunO3n+1 (n = 1, 2, . . . , ∞) have garnered enormous attention [1] since the discovery of high-temperature superconductivity in cuprates
We report here on multiple experimental indications of superconductivity with the onset above 40 K in strontium ruthenate doped by rhenium and selenium with chlorine used as a flux
This remarkable finding in micronanocrystals [11] demonstrated how rich the superconducting phenomena in ruthenates can be. It invigorates the value of polycrystalline materials, in which the samples in [8] were originally prepared before subsequent sonification to obtain micronanocrystals. In this Rapid Communication, we present spectroscopic data in the FIR range obtained on polycrystalline samples of initial stoichiometric composition of Sr2Ru1−xRexO4−ySey
Summary
The fascinating properties of strontium ruthenates Srn+1RunO3n+1 ∞) have garnered enormous attention [1] since the discovery of high-temperature superconductivity in cuprates. Superconductivity in ruthenates was found only for the n = 1 case [2] with Tc as high as 1.5 K [3]. Other representatives of this RuddlesdenPopper family possess peculiar magnetic properties. NMR spectroscopy reinvestigation [7] has given compelling evidence that the superconductivity in Sr2RuO4 is likely to be even parity, which unequivocally demonstrates that research on the physical properties of ruthenates is far from being complete
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