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Conventional superconductivity and charge-density-wave ordering in Ba_{1−x}Na_{x}Ti_{2}Sb_{2}O


von Rohr, Fabian; Schilling, Andreas; Nesper, Reinhard; Baines, Chris; Bendele, Markus (2013). Conventional superconductivity and charge-density-wave ordering in Ba_{1−x}Na_{x}Ti_{2}Sb_{2}O. Physical Review B, 88(14):140501.

Abstract

We have investigated the low-temperature physical properties of BaTi2Sb2O and Ba1−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=58 K in 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.

Abstract

We have investigated the low-temperature physical properties of BaTi2Sb2O and Ba1−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=58 K in 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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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2013
Deposited On:09 Dec 2013 09:24
Last Modified:05 Apr 2016 17:13
Publisher:American Physical Society
ISSN:1098-0121
Publisher DOI:https://doi.org/10.1103/PhysRevB.88.140501

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