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Conventional superconductivity and charge-density-wave ordering in Ba1−xNaxTi2Sb2O

Publication date2013-10-01
First online date2013-10-01
Abstract

We have investigated the low-temperature physical properties of BaTi2Sb2O andBa1−xNaxTi2Sb2O (x = 0.05, 0.1, 0.15, 0.2, 0.25, 0.3) by means of muon spin rotation (μSR) and SQUID magnetometry. Our measurements reveal the absence of magnetic ordering below TDW = 58Kin the parent compound. Therefore the phase transition at this temperature observed by magnetometry is most likely due to the formation of a charge-denisty wave (CDW). Upon substitution of barium by sodium in Ba1−xNaxTi2Sb2O we find for x = 0.25 superconductivity with a maximum Tc = 5.1 K in the magnetization and a bulk Tc,bulk = 4.5 K in the μSR measurements. The temperature dependency of the London penetration depth λ−2(T) of the optimally doped compound can be well explained within a conventional weak-coupling scenario in the clean limit.

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Citation (ISO format)
VON ROHR, Fabian et al. Conventional superconductivity and charge-density-wave ordering in Ba<sub>1−x</sub>Na<sub>x</sub>Ti<sub>2</sub>Sb<sub>2</sub>O. In: Physical review. B, Condensed matter and materials physics, 2013, vol. 88, n° 14, p. 140501. doi: 10.1103/PhysRevB.88.140501
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ISSN of the journal1098-0121
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