CDW order and unconventional s-wave superconductivity in Ba1-xNaxTi2Sb2O

13th International Conference on Muon Spin Rotation, Relaxation and Resonance

Kamusella, Sirko^1 ; Doan, Phuong^2 ; Goltz, Til^1 ; Luetkens, Hubertus^3 ; Sarkar, Rajib^1 ; Guloy, Arnold^2 ; Klauss, Hans-Henning^1

Institut für Festkörperphysik, Technische Universität Dresden, Dresden

01062, Germany^1

TCSUH and Department of Chemistry, University of Houston, TX

772034-5003, United States^2

Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institut, Villigen

5232, Switzerland^3

关键词: Density waves;    Ginzburg-Landau models;    Powder samples;    S-waves;    Superconducting order parameters;    Titanium-based;    Unconventional superconductivity;    Vortex state;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/551/1/012026/pdf
DOI  :  10.1088/1742-6596/551/1/012026

来源: IOP

【 摘 要 】

Due to its anticuprate Ti2O layer and its fascinating phase diagram with a large coexistence area of superconductivity and a density wave phase, the new class of titanium based superconductors attracts great scientific interest. In this paper we report μSR investigation on powder samples of Ba1-xNaxTi2Sb2O (x 0, 0.15, 0.25). Our results exhibit both the presence of a charge density wave and superconductivity in Ba1-xNaxTi2Sb2O. The superconducting order parameter, extracted from a vortex state analysis using the numeric Ginzburg-Landau model, is compatible with a s-wave symmetry. In the universal Uemura classification of superconductors this compound is at the verge of unconventional superconductivity.