Ferromagnetic Spin Fluctuation and Unconventional Superconductivity inRb2Cr3As3Revealed by

Jie Yang

¹

,

Zhenwei Tang

²

,

Guanghan Cao

³

et al.

Temperature and angular dependence of the upper critical field in K2Cr3As3

“…We argue that a dominant spintriplet pairing is more natural to meet the experimental data. Note that the spin-triplet pairing is consistent with the previous implications/suggestions in experimental and theoretical studies [14,15,[20][21][22][23][25][26][27]. We hope our result helps to find the exact superconducting order parameter in K 2 Cr 3 As 3 , which might expand the overall understanding of unconventional superconductivity.…”

“…(3) The 75 As nuclear quadrapole resonance (NQR) shows a strong enhancement of Cr-spin fluctuations above T c and, there is no Hebel-Slichter coherence peak in the temperature dependence of nuclear spinlattice relaxation rate just below T c for K 2 Cr 3 As 3 [20]. Similar result is given by the nuclear magnetic resonance (NMR) for Rb 2 Cr 3 As 3 , from which ferromagnetic spin fluctuations are additionally evidenced [21], supporting a spin-triplet pairing scenario. The latter seems to be consistent with the observation of a spontaneous internal magnetic field near T c , although being very weak, in the muon spin relaxation or rotation (µSR) experiment [22].…”

Cs133andAs75NMR investigation of the normal metallic state of quasi-one-dimensionalZhi1, Lee2, Imai3 et al. 2016Phys. Rev. B276280View full textAdd to dashboardCite

“…We also measured the Cr low frequency spin fluctuations through 1/T 1 T (the nuclear spin-lattice relaxation rate 1/T 1 divided by temperature T) at the 75 As sites using Nuclear Quadrupole Resonance (NQR) in zero external field. We found that, unlike K 2 Cr 3 As 3 [15] and Rb 2 Cr 3 As 3 [24], low frequency Cr spin fluctuation are suppressed towards T c .…”

“…Such a systematic variation of T c naturally raises an important question: what is the key controlling factor of T c ? Comparison of various physical properties reported thus far seem to indicate that many of the characteristic properties of K 2 Cr 3 As 3 are shared with Rb 2 Cr 3 As 3 and Cs 2 Cr 3 As 3 [4][5][6][22][23][24].…”

Charge fluctuations and nodeless superconductivity in quasi-one-dimensionalTa4Pd3Te16revealed byT

“…181 Ta possesses a large nuclear quadrupole moment, Q = 4.2 × 10 −24 cm 2 , which is ten times larger than those for such nuclei as 75 As or 63 Cu. This is why the NQR frequency observed is much higher than that of 75 As in iron-arsenides [17] and Cr-arsenides [18] or 63 Cu in cuprates [19] where the 75 As-NQR frequency is less than 50 MHz and the 63 Cu-NQR frequency is less than 40 MHz.…”