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Pairing symmetry of an intermediate valence superconductor CeIr3 investigated using muSR measurements | | D. T. Adroja
; A. Bhattacharyya
; Y. J. Sato
; M. R. Lees
; P. K. Biswas
; K. Panda
; Gavin B. G. Stenning
; A. D. Hillier
; D. Aoki
; | | Date: |
9 Jan 2020 | | Abstract: | We have investigated the bulk and microscopic properties of the rhombohedral
intermediate valence superconductor CeIr$_3$ by employing magnetization, heat
capacity, and muon spin rotation and relaxation ($mu$SR) measurements. The
magnetic susceptibility indicates bulk superconductivity below $T_mathrm{C} =
3.1$~K. Heat capacity data also reveal a bulk superconducting transition at
$T_mathrm{C} = 3.1$~K with a second weak anomaly near 1.6~K. At
$T_{mathrm{C}}$, the jump in heat capacity $Delta C$/$gamma T_{mathrm{C}}
sim 1.39(1)$, is slightly less than the BCS weak coupling limit of 1.43.
Transverse-field $mu$SR measurements suggest a fully gapped, isotropic,
$s$-wave superconductivity with 2$Delta(0)/k_{mathrm{B}}T_{mathrm{C}} =
3.76(3)$, very close to 3.56, the BCS gap value for weak-coupling
superconductors. From the temperature variation of magnetic penetration depth,
we have also determined the London penetration depth $lambda_{mathrm{L}}(0) =
435(2)$~nm, the carriers’ effective mass enhancement $m^{*} =
1.69(1)m_{mathrm{e}}$ and the superconducting carrier density $n_{mathrm{s}}
= 2.5(1) imes 10^{26}$ carriers m$^{-3}$. The fact that LaIr$_3$, with no
$4f$-electrons, and CeIr$_3$ with $4f^{n}$ electrons where $n le 1$-electron
(Ce ion in a valence fluctuating state), both exhibit the same $s$-wave gap
symmetry indicates that the physics of these two compounds is governed by the
Ir-$d$ band near the Fermi-level, which is in agreement with previous band
structure calculations. | | Source: | arXiv, 2001.3201 | | Services: | Forum | Review | PDF | Favorites | |
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