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- W2923312 abstract "In order to understand superconductivity in low carrier density systems we have grown a high quality single crystal of Lu$_3$Os$_4$Ge$_{13}$ by Czochralski method and studied its normal and superconducting state properties. Lu$_3$Os$_4$Ge$_{13}$ crystallizes in cubic crystal structure with the space group $it{Pm3n}$. Lu$_3$Os$_4$Ge$_{13}$ is a low carrier density superconductor ($napprox10^{18}/cm^3$) as determined by the electrical transport, magnetization, heat capacity and hall effect measurements. The measurements confirm that Lu$_3$Os$_4$Ge$_{13}$ is a type-II superconductor ($T{_c} =3.1$~K) and exhibits anomalous superconducting properties. The analysis of the heat capacity below $T{_c}$ and reduced heat capacity jump at $T{_c}$ suggest that Lu$_3$Os$_4$Ge$_{13}$ is a moderately coupled multi-band BCS superconductor. The dc-magnetization ($M-H$) study shows a large reversible region in the superconducting mixed state. This reversible region consists of unpinned vortices in the magnetic phase diagram, similar to what is known as the vortex liquid phase in high-$T{_c}$ superconductors. The estimation of the Ginzburg number $G_{i}$ suggests that the thermal fluctuations may not play an important role in the unpinning of the vortices in this compound. The thermopower measurements show a large phonon drag effect at low temperatures. The electronic band structure calculations show a multi-valley type band structure and a complex Fermi surface in Lu$_3$Os$_4$Ge$_{13}$, making it a possible candidate to observe a magnetic field induced triplet superconductivity at ultra-low temperatures." @default.
- W2923312 created "2016-06-24" @default.
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- W2923312 date "2014-09-15" @default.
- W2923312 modified "2023-09-27" @default.
- W2923312 title "Anomalous superconducting properties of Lu$_3$Os$_4$Ge$_{13}$ single crystal" @default.
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