Microscopic parameters of a type-II superconductor measured by small-angle neutron scattering
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866914386570903552 |
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| author | Venero, D. Alba Valente-Feliciano, A. -M. Bernal, O. O. Kozhevnikov, V. |
| author_facet | Venero, D. Alba Valente-Feliciano, A. -M. Bernal, O. O. Kozhevnikov, V. |
| contents | A necessary condition for understanding and predicting the properties of any material is knowledge of microscopic parameters which control these properties in a state of thermodynamic equilibrium. One can show (see, e.g., Ref.\,\cite{VK_book}), that in superconductors these parameters are the radius of the orbital motion of electrons bound in Cooper pairs $R_0$ and the radius of the field-induced currents $r_i$ caused by precession of the pairs; one more parameter, associated with $r_i$, is the number density of Cooper pairs $n_{cp}$. In this paper we report on the first measurements of these parameters in a type-II superconductor (niobium) by SANS (small-angle neutron scattering). Other approaches to measuring the microscopic parameters are considered. Our work suggests novel avenues for studying superconductivity, important for disclosing its mechanisms in superconductors of all kinds. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_18736 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Microscopic parameters of a type-II superconductor measured by small-angle neutron scattering Venero, D. Alba Valente-Feliciano, A. -M. Bernal, O. O. Kozhevnikov, V. Superconductivity A necessary condition for understanding and predicting the properties of any material is knowledge of microscopic parameters which control these properties in a state of thermodynamic equilibrium. One can show (see, e.g., Ref.\,\cite{VK_book}), that in superconductors these parameters are the radius of the orbital motion of electrons bound in Cooper pairs $R_0$ and the radius of the field-induced currents $r_i$ caused by precession of the pairs; one more parameter, associated with $r_i$, is the number density of Cooper pairs $n_{cp}$. In this paper we report on the first measurements of these parameters in a type-II superconductor (niobium) by SANS (small-angle neutron scattering). Other approaches to measuring the microscopic parameters are considered. Our work suggests novel avenues for studying superconductivity, important for disclosing its mechanisms in superconductors of all kinds. |
| title | Microscopic parameters of a type-II superconductor measured by small-angle neutron scattering |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2511.18736 |