تقرير
Oxygen isotope effect on the superfluid density within the $d-$wave and $s-$wave pairing channels of YBa$_2$Cu$_4$O$_8$
| العنوان: | Oxygen isotope effect on the superfluid density within the $d-$wave and $s-$wave pairing channels of YBa$_2$Cu$_4$O$_8$ |
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| المؤلفون: | Khasanov, Rustem, Shengelaya, Alexander, Conder, Kazimierz, Karpinski, Janusz, Bussmann-Holder, Annette, Keller, Hugo |
| المصدر: | Physica C: Superconductivity and its Applications, 613, 1354332 (2023) |
| سنة النشر: | 2023 |
| المجموعة: | Condensed Matter |
| مصطلحات موضوعية: | Condensed Matter - Superconductivity, Condensed Matter - Strongly Correlated Electrons |
| الوصف: | We report on measurements of the oxygen isotope ($^{16}$O/$^{18}$O) effect (OIE) on the transition temperature $T_{\rm c}$ and the zero-temperature in-plane magnetic penetration depth $\lambda_{\rm ab}(0)$ in the stoichiometric cuprate superconductor YBa$_2$Cu$_4$O$_8$ by means of muon-spin rotation/relaxation. An analysis of the temperature evolution of $\lambda^{-2}_{\rm ab}$ in terms of coexisting $s+d-$wave order parameters reveals that the OIE on the superfluid density $\rho_{\rm s}(0)\propto\lambda^{-2}_{\rm ab}(0)$ stems predominantly from the $d-$wave component while the contribution of the $s-$wave one is almost zero. The OIE on the transition temperature $T_{\rm c}$ is found to be rather small: $\delta T_{\rm c}/T_{\rm c}= -0.32(7)$%, compared to the total OIE on the superfluid density $\rho_{\rm s}(0)$: $\delta \rho_{\rm s}(0)/\rho_{\rm s}(0)= -2.8(1.0)$%. The partial OIE's on the corresponding $d-$wave and $s-$wave components of $\rho_{\rm s}(0)$ are $\delta \rho_{\rm s,d}(0)/\rho_{\rm s}(0)= -3.0(1.2)$%, and $\delta \rho_{\rm s,s}(0)/\rho_{\rm s}(0)= 0.2(1.2)$%, respectively. Our results demonstrate that polaron formation in the CuO$_2$ planes is the origin of the observed OIE in the $d-$wave channel. In the much weaker $s-$wave channel, fermionic quasiparticles are present, which do not contribute to the OIE on $\rho_{\rm s}(0)$. Our results support the original idea of K. Alex M\"{u}ller on the polaronic nature of the supercarries in high-temperature cuprate superconductors. Comment: Contribution to a special issue by Physica C: "Oxide superconductors and beyond - In memoriam of Professor Karl Alex M\"uller" |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.physc.2023.1354332 |
| URL الوصول: | http://arxiv.org/abs/2306.08112 |
| رقم الأكسشن: | edsarx.2306.08112 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.physc.2023.1354332 |
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