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• W2066173721 abstract "Using a combination of muon-spin relaxation ($mu$SR), inelastic neutron scattering (INS) and nuclear magnetic resonance (NMR), we investigated the novel iron-based superconductor with a triclinic crystal structure (CaFe$_{1-x}$Pt$_x$As)$_{10}$Pt$_3$As$_8$ (T$_{rm c}$ = 13 K), containing platinum-arsenide intermediary layers. The temperature dependence of the superfluid density obtained from the $mu$SR relaxation-rate measurements indicates the presence of two superconducting gaps, $Delta_text{1}ggDelta_text{2}$. According to our INS measurements, commensurate spin fluctuations are centered at the ($pi$, 0) wave vector, like in most other iron arsenides. Their intensity remains unchanged across T$_text{c}$, indicating the absence of a spin resonance typical for many Fe-based superconductors. Instead, we observed a peak in the spin-excitation spectrum around $hslashomega_0=,$7 meV at the same wave vector, which persists above T$_{rm c}$ and is characterized by the ratio $hslashomega_0/k_text{B}T_text{c}approx,$6.2, which is significantly higher than typical values for the magnetic resonant modes in iron pnictides (~4.3). The temperature dependence of magnetic intensity at 7 meV revealed an anomaly around T* = 45 K related to the disappearance of this new mode. A suppression of the spin-lattice relaxation rate, $1/T_1T$, observed by NMR immediately below T* without any notable subsequent anomaly at T$_{rm c}$, indicates that T* could mark the onset of a pseudogap in (CaFe$_{1-x}$Pt$_x$As)$_{10}$Pt$_3$As$_8$, which is likely associated with the emergence of preformed Cooper pairs." @default.
• W2066173721 created "2016-06-24" @default.
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• W2066173721 date "2015-03-18" @default.
• W2066173721 modified "2023-10-06" @default.
• W2066173721 title "Superconducting properties and pseudogap from preformed Cooper pairs in the triclinic(CaFe1−xPtxAs)10Pt3As8" @default.
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• W2066173721 doi "https://doi.org/10.1103/physrevb.91.104515" @default.
• W2066173721 hasPublicationYear "2015" @default.
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