Paradigm shift toward the clarification of  the superconductivity in Sr2RuO4

 

 

A very recent NMR report on Sr₂RuO₄indicates that the Knight shift decays in the superconducting states in the “3-K phase” under uniaxial stress, as well as in the “1.5-K phase” without stress [1]. The invariant NMR Knight shift in previous reports [2] was likely due to Joule heating of the samples by the RF pulses [1, 3]. Such new information urges us to re-examine the interpretations of a variety of experimental results on Sr₂RuO₄. 

 

In this talk, we will review the validity of interpretations in previous experiments, which were based on the spin-triplet chiral p-wave scenario. We also introduce recent muSR experiments under uniaxial strain and discuss issues and possible resolutions in this new paradigm.

 

The contents of this talk was done mainly in collaborations with Kenji Ishida, Clifford Hicks and Hans-Hennings Klaus.

 

 

[1] A. Pustogow et al., arXiv.1904.00047.

[2] Y. Maeno, S. Kittaka, T. Nomura, S. Yonezawa, and K. Ishida, J. Phys. Soc. Jpn. 81, 011009 (2012).

[3] K. Ishida, M. Manago, and Y. Maeno, arXiv:1907.12236.