Ti4Ir2O a time-reversal-invariant fully gapped unconventional superconductor
arxiv(2024)
摘要
Here we report muon spin rotation (muSR) experiments on the temperature and
field dependence of the effective magnetic penetration depth (lambda) in the
eta-carbide-type suboxide Ti4Ir2O, a superconductor with an considerably high
upper critical field. Temperature dependence of penetration depth, obtained
from transverse-field (TF)-muSR measurements, is in perfect agreement with an
isotropic fully gaped superconducting state. Furthermore, our ZF muSR results
confirm that the time-reversal symmetry is preserved in the superconducting
state. We find, however, a notably low ratio of 1.22 between the
superconducting critical temperature and the superfluid density. 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.
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