Influence of pressure on properties of multi-gap type-I superconductor BeAu
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| Format: | Preprint |
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2025
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| _version_ | 1866911158638739456 |
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| author | Khasanov, Rustem Vocaturo, Riccardo Janson, Oleg Koitzsch, Andreas Gupta, Ritu Das, Debarchan Casati, Nicola P. M. Vergniory, Maia G. Brink, Jeroen van den Svanidze, Eteri |
| author_facet | Khasanov, Rustem Vocaturo, Riccardo Janson, Oleg Koitzsch, Andreas Gupta, Ritu Das, Debarchan Casati, Nicola P. M. Vergniory, Maia G. Brink, Jeroen van den Svanidze, Eteri |
| contents | We report on studies of the superconducting and normal state properties of the noncentrosymmetric superconductor BeAu under hydrostatic pressure conditions. The room-temperature equation of state (EOS) reveals the values of the bulk modulus ($B_0$) and its first derivative ($B^\prime_0$) at ambient pressure to be $B_0 \simeq 132$~GPa and $B^\prime_0 \simeq 30$, respectively. Up to the highest pressures studied ($p \simeq 2.2$~GPa), BeAu remains a multi-gap type-I superconductor. The analysis of $B_{\rm c}(T, p)$ data within the self-consistent two-gap approach suggests the presence of two superconducting energy gaps, with the gap-to-$T_{\rm c}$ ratios $Δ_1/k_{\rm B}T_{\rm c} \sim 2.3$ and $Δ_2/k_{\rm B}T_{\rm c} \sim 1.1$ for the larger and smaller gaps, respectively [$Δ= Δ(0)$ is the zero-temperature value of the gap and $k_{\rm B}$ is the Boltzmann constant]. With increasing pressure, $Δ_1/k_{\rm B}T_{\rm c}$ increases while $Δ_2/k_{\rm B}T_{\rm c}$ decreases, suggesting that pressure enhances (weakens) the coupling strength between the superconducting carriers within the bands where the larger (smaller) superconducting energy gap has opened. The superconducting transition temperature $T_{\rm c}$, \textcolor{black}{the zero-temperature values of the superconducting gaps $Δ_1$ and $Δ_2$} and the zero-temperature value of the thermodynamic critical field $B_{\rm c}(0)$ decrease with increasing pressure, with the rates of ${\rm d}T_{\rm c}/{\rm d}p \simeq -0.195$~K/GPa, \textcolor{black}{${\rm d}Δ_1/{\rm d}p \simeq -0.034$~meV/GPa, ${\rm d}Δ_2/{\rm d}p \simeq -0.029$~meV/GPa,} and ${\rm d}B_{\rm c}(0)/{\rm d}p = -2.65(1)$~mT/GPa, respectively. The measured $B_{\rm c}(0)$ values plotted as a function of $T_{\rm c}$ follow an empirical scaling relation established for conventional type-I superconductors. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2502_00913 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Influence of pressure on properties of multi-gap type-I superconductor BeAu Khasanov, Rustem Vocaturo, Riccardo Janson, Oleg Koitzsch, Andreas Gupta, Ritu Das, Debarchan Casati, Nicola P. M. Vergniory, Maia G. Brink, Jeroen van den Svanidze, Eteri Superconductivity We report on studies of the superconducting and normal state properties of the noncentrosymmetric superconductor BeAu under hydrostatic pressure conditions. The room-temperature equation of state (EOS) reveals the values of the bulk modulus ($B_0$) and its first derivative ($B^\prime_0$) at ambient pressure to be $B_0 \simeq 132$~GPa and $B^\prime_0 \simeq 30$, respectively. Up to the highest pressures studied ($p \simeq 2.2$~GPa), BeAu remains a multi-gap type-I superconductor. The analysis of $B_{\rm c}(T, p)$ data within the self-consistent two-gap approach suggests the presence of two superconducting energy gaps, with the gap-to-$T_{\rm c}$ ratios $Δ_1/k_{\rm B}T_{\rm c} \sim 2.3$ and $Δ_2/k_{\rm B}T_{\rm c} \sim 1.1$ for the larger and smaller gaps, respectively [$Δ= Δ(0)$ is the zero-temperature value of the gap and $k_{\rm B}$ is the Boltzmann constant]. With increasing pressure, $Δ_1/k_{\rm B}T_{\rm c}$ increases while $Δ_2/k_{\rm B}T_{\rm c}$ decreases, suggesting that pressure enhances (weakens) the coupling strength between the superconducting carriers within the bands where the larger (smaller) superconducting energy gap has opened. The superconducting transition temperature $T_{\rm c}$, \textcolor{black}{the zero-temperature values of the superconducting gaps $Δ_1$ and $Δ_2$} and the zero-temperature value of the thermodynamic critical field $B_{\rm c}(0)$ decrease with increasing pressure, with the rates of ${\rm d}T_{\rm c}/{\rm d}p \simeq -0.195$~K/GPa, \textcolor{black}{${\rm d}Δ_1/{\rm d}p \simeq -0.034$~meV/GPa, ${\rm d}Δ_2/{\rm d}p \simeq -0.029$~meV/GPa,} and ${\rm d}B_{\rm c}(0)/{\rm d}p = -2.65(1)$~mT/GPa, respectively. The measured $B_{\rm c}(0)$ values plotted as a function of $T_{\rm c}$ follow an empirical scaling relation established for conventional type-I superconductors. |
| title | Influence of pressure on properties of multi-gap type-I superconductor BeAu |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2502.00913 |