Publications Repository - Gdańsk University of Technology

Here we report muon spin rotation (μSR) experiments on the temperature and field dependence of the effective magnetic penetration depth λ(T ) in the η-carbide-type suboxide Ti4Ir2O, a superconductor with a considerably high upper critical field. The temperature dependence of λ(T ), obtained from transverse-field (TF)-μSR measurements, is in perfect agreement with an isotropic fully gaped superconducting state. Furthermore, our ZF μSR results confirm that the time-reversal symmetry is preserved in the superconducting state. We find, however, a remarkably small ratio of Tc/λ −2 0 ∼ 1.22. This value is close to most unconventional superconductors, showing that a very small superfluid density is present in the superconducting state of Ti4Ir2O. The presented results will pave the way for further theoretical and experimental investigations to obtain a microscopic understanding of the origin of such a high upper critical field in an isotropic single-gap superconducting system.

Authors

• Debarchan Das,
• KeYuan Ma,
• Jan Jaroszynski,
• Vahid Sazgari,
• prof. dr hab. inż. Tomasz Klimczuk link open in new tab ,
• Fabian O. von Rohr,
• Zurab Guguchia