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

被引：25
|
作者：
von Rohr, Fabian [1 ,2 ]
Schilling, Andreas [1 ]
Nesper, Reinhard [2 ]
Baines, Chris [3 ]
Bendele, Markus [4 ]
机构：
[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland
[2] ETH, Inorgan Chem Lab, CH-8093 Zurich, Switzerland
[3] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland
[4] Univ Roma La Sapienza, Dipartimento Fis, I-00185 Rome, Italy
来源：
PHYSICAL REVIEW B | 2013年 / 88卷 / 14期
基金：
瑞士国家科学基金会;
关键词：
PENETRATION DEPTH; CRYSTAL-STRUCTURE; VORTEX STATE; MU-SR; TEMPERATURE; SPIN;
D O I：
10.1103/PhysRevB.88.140501
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 (mu SR) and SQUID magnetometry. Our measurements reveal the absence of magnetic ordering below T-DW = 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 T-c = 5.1 K in the magnetization and a bulk T-c,T-bulk = 4.5 K in the mu SR measurements. The temperature dependency of the London penetration depth lambda(-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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页数：5
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