Conventional superconductivity and charge-density-wave ordering in Ba1−xNaxTi2Sb2O
Fabian von Rohr, Andreas Schilling, Reinhard Nesper, Chris Baines, Markus Bendele
DOI 10.1103/PhysRevB.88.140501 · Physical Review B
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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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1 | Pressure not reported | unknown |
| Ba1-xNaxTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.1 | Pressure not reported | onset |
| Ba1-xNaxTi2Sb2O Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 4.5 | Pressure not reported | midpoint |
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