Two-fluid model analysis of the terahertz conductivity of YBaCuO samples: optimally doped, underdoped and overdoped cases
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| Format: | Preprint |
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2023
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| _version_ | 1866908151557652480 |
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| author | Šindler, Michal Tzeng, Wen-Yen Luo, Chih-Wei Lin, Jiunn-Yuan Kadlec, Christelle |
| author_facet | Šindler, Michal Tzeng, Wen-Yen Luo, Chih-Wei Lin, Jiunn-Yuan Kadlec, Christelle |
| contents | The complex conductivity of underdoped and optimally doped YBa$_2$Cu$_3$O$_{7-δ}$ samples and overdoped similar compound Y$_{0.7}$Ca$_{0.3}$Ba$_2$Cu$_3$O$_{7-δ}$ was measured using time-domain terahertz spectroscopy. In the normal state, the frequency dependence is described by the Drude model. Below the critical temperature $T_\mathrm{c}$, the two-fluid model was successfully employed to fit all the spectra, from 5 K up to $T_\mathrm{c}$. The temperature behaviour of fundamental parameters such as the scattering rate $1/τ$, the superfluid (normal) fraction $f_\mathrm{s}$ ($f_\mathrm{n}$) and the conductivity $σ$ was investigated at given frequencies. For the optimally doped and the overdoped samples, even at 5 K, a fifth of the electrons do not condense to the superfluid fraction. We observed that a substantial fraction of electrons do not condense to the superfluid fraction even at 5 K for optimally doped and overdoped samples. The real part of the conductivity $σ_1(T)$ exhibits a peak at low frequencies. It can be observed for all three stoichiometries and its exact shape depends on the quality of the sample. A further analysis shows that this peak is a consequence of the competition between the scattering time $τ(T)$ and the superfluid fraction $f_\mathrm{s}(T)$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_17408 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Two-fluid model analysis of the terahertz conductivity of YBaCuO samples: optimally doped, underdoped and overdoped cases Šindler, Michal Tzeng, Wen-Yen Luo, Chih-Wei Lin, Jiunn-Yuan Kadlec, Christelle Superconductivity The complex conductivity of underdoped and optimally doped YBa$_2$Cu$_3$O$_{7-δ}$ samples and overdoped similar compound Y$_{0.7}$Ca$_{0.3}$Ba$_2$Cu$_3$O$_{7-δ}$ was measured using time-domain terahertz spectroscopy. In the normal state, the frequency dependence is described by the Drude model. Below the critical temperature $T_\mathrm{c}$, the two-fluid model was successfully employed to fit all the spectra, from 5 K up to $T_\mathrm{c}$. The temperature behaviour of fundamental parameters such as the scattering rate $1/τ$, the superfluid (normal) fraction $f_\mathrm{s}$ ($f_\mathrm{n}$) and the conductivity $σ$ was investigated at given frequencies. For the optimally doped and the overdoped samples, even at 5 K, a fifth of the electrons do not condense to the superfluid fraction. We observed that a substantial fraction of electrons do not condense to the superfluid fraction even at 5 K for optimally doped and overdoped samples. The real part of the conductivity $σ_1(T)$ exhibits a peak at low frequencies. It can be observed for all three stoichiometries and its exact shape depends on the quality of the sample. A further analysis shows that this peak is a consequence of the competition between the scattering time $τ(T)$ and the superfluid fraction $f_\mathrm{s}(T)$. |
| title | Two-fluid model analysis of the terahertz conductivity of YBaCuO samples: optimally doped, underdoped and overdoped cases |
| topic | Superconductivity |
| url | https://arxiv.org/abs/2309.17408 |