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Evidence of unconventional pairing in the quasi two-dimensional CuIr$_2$Te$_4$ superconductor
- Source :
- Phys. Rev. B 106, 144505 (2022)
- Publication Year :
- 2022
-
Abstract
- The CuIr$_{2-x}$Ru$_x$Te$_4$ superconductors (with a $T_c$ around 2.8 K) can host charge-density waves, whose onset and interplay with superconductivity are not well known at a microscopic level. Here, we report a comprehensive study of the $x$ = 0 and 0.05 cases, whose superconductivity was characterized via electrical-resistivity-, magnetization-, and heat-capacity measurements, while their microscopic superconducting properties were studied via muon-spin rotation and relaxation ($\mu$SR). In CuIr$_{2-x}$Ru$_x$Te$_4$, both the temperature-dependent electronic specific heat and the superfluid density (determined via transverse-field $\mu$SR) are best described by a two-gap (s+d)-wave model, comprising a nodeless gap and a gap with nodes. The multigap superconductivity is also supported by the temperature dependence of the upper critical field $H_\mathrm{c2}(T)$. However, under applied pressure, a charge-density-wave order starts to develop and, as a consequence, the superconductivity of CuIr$_2$Te$_4$ achieves a more conventional s-wave character. From a series of experiments, we provide ample evidence that the CuIr$_{2-x}$Ru$_x$Te$_4$ family belongs to the rare cases, where an unconventional superconducting pairing is found near a charge-density-wave quantum critical point.<br />Comment: 10 pages, 12 figures
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. B 106, 144505 (2022)
- Publication Type :
- Report
- Accession number :
- edsarx.2210.07070
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevB.106.144505