Conventional superconductivity and charge-density-wave ordering in Ba1-xNaxTi2Sb2O
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2013-10-01
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Journal Article
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Abstract
We have investigated the low-temperature physical properties of BaTi 2Sb2O and Ba1-xNaxTi 2Sb2O (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-xNaxTi 2Sb2O 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. © 2013 American Physical Society.
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88 (14)
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American Physical Society
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Organisational unit
03306 - Nesper, Reinhard (emeritus)
02513 - Laboratorium für Anorganische Chemie / Laboratory of Inorganic Chemistry