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.

引用

页数：5

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