EuFe2(As1-xPx)(2) hosts complex dynamical processes resulting from the interplay of its two electronic ground states, i.e., ferromagnetism and superconductivity. A detailed understanding of the observed dynamics is, however, still missing. In this sense, frequency-resolved experimental techniques can be crucial to disentangle the magnetic and/or superconducting origin of the phenomenology and to contribute to its modeling. Here, we report on the investigation of EuFe2(As0.7P0.3)(2) based on muon-spin spectroscopy and ac magnetic susceptibility (chi) measurements. The dependence of the internal field at the muon site on temperature is indicative of ferromagnetic ordering for the Eu2+ magnetic moments and only the conventional magnon scattering governs the longitudinal relaxation rate at low temperatures. At the same time, we observe a rich phenomenology for the imaginary component of the susceptibility. chi '' by means of both standard ac susceptibility and a technique based on a microwave coplanar waveguide resonator. In particular, we detect activated trends for several features in. "chi" over frequencies spanning ten orders of magnitude. To explain our results, we propose a model for the complex dynamics of vortices and antivortices influenced by the underlying structure of magnetic Meissner domains based on the identification of intra and interdomain depinning processes.
Prando, G., Torsello, D., Sanna, S., Graf, M.J., Pyon, S., Tamegai, T., et al. (2022). Complex vortex-antivortex dynamics in the magnetic superconductor EuFe2(As0.7P0.3)(2). PHYSICAL REVIEW. B, 105(22), 1-9 [10.1103/PhysRevB.105.224504].
Complex vortex-antivortex dynamics in the magnetic superconductor EuFe2(As0.7P0.3)(2)
Sanna, S;
2022
Abstract
EuFe2(As1-xPx)(2) hosts complex dynamical processes resulting from the interplay of its two electronic ground states, i.e., ferromagnetism and superconductivity. A detailed understanding of the observed dynamics is, however, still missing. In this sense, frequency-resolved experimental techniques can be crucial to disentangle the magnetic and/or superconducting origin of the phenomenology and to contribute to its modeling. Here, we report on the investigation of EuFe2(As0.7P0.3)(2) based on muon-spin spectroscopy and ac magnetic susceptibility (chi) measurements. The dependence of the internal field at the muon site on temperature is indicative of ferromagnetic ordering for the Eu2+ magnetic moments and only the conventional magnon scattering governs the longitudinal relaxation rate at low temperatures. At the same time, we observe a rich phenomenology for the imaginary component of the susceptibility. chi '' by means of both standard ac susceptibility and a technique based on a microwave coplanar waveguide resonator. In particular, we detect activated trends for several features in. "chi" over frequencies spanning ten orders of magnitude. To explain our results, we propose a model for the complex dynamics of vortices and antivortices influenced by the underlying structure of magnetic Meissner domains based on the identification of intra and interdomain depinning processes.File | Dimensione | Formato | |
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