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Pressure Induced Enhancement of Superconductivity in LaRu2P2.

Li B, Lu P, Liu J, Sun J, Li S, Zhu X, Wen HH - Sci Rep (2016)

Bottom Line: The ab-initio calculation shows that the superconductivity in LaRu2P2 at ambient pressure can be explained by the McMillan's theory with strong electron-phonon coupling.Detailed analysis of the pressure induced evolution of resistivity and upper critical field Hc2(T) reveals that the increase of Tc with pressure may be accompanied by the involvement of extra electron-boson interaction.This suggests that the Ru-based system has some commonality as the Fe-based superconductors.

View Article: PubMed Central - PubMed

Affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

ABSTRACT
To explore new superconductors beyond the copper-based and iron-based systems is very important. The Ru element locates just below the Fe in the periodic table and behaves like the Fe in many ways. One of the common thread to induce high temperature superconductivity is to introduce moderate correlation into the system. In this paper, we report the significant enhancement of superconducting transition temperature from 3.8 K to 5.8 K by using a pressure only of 1.74 ± 0.05 GPa in LaRu2P2 which has an iso-structure of the iron-based 122 superconductors. The ab-initio calculation shows that the superconductivity in LaRu2P2 at ambient pressure can be explained by the McMillan's theory with strong electron-phonon coupling. However, it is difficult to interpret the enhancement of Tc versus pressure within this picture. Detailed analysis of the pressure induced evolution of resistivity and upper critical field Hc2(T) reveals that the increase of Tc with pressure may be accompanied by the involvement of extra electron-boson interaction. This suggests that the Ru-based system has some commonality as the Fe-based superconductors.

No MeSH data available.


Fitting to the resistivity data under different pressures.(a) The electrical resistivity data and the fitting results under various pressures as shown by symbols and solid lines, respectively. The data of resistivity versus temperature is fitted in the temperature range of just above Tc to about 30 K with the general formula ρ = ρ0 + ATn, here ρ0 represents the residual resistivity due to the impurity scattering. The obtained coefficient ρ0, A, n under different pressures are presented in (b–d) respectively.
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f3: Fitting to the resistivity data under different pressures.(a) The electrical resistivity data and the fitting results under various pressures as shown by symbols and solid lines, respectively. The data of resistivity versus temperature is fitted in the temperature range of just above Tc to about 30 K with the general formula ρ = ρ0 + ATn, here ρ0 represents the residual resistivity due to the impurity scattering. The obtained coefficient ρ0, A, n under different pressures are presented in (b–d) respectively.

Mentions: In order to get a deeper insight of the pressure induced enhancement of superconductivity, we take a look at the normal state resistivity under a pressure. The experimental data and the fitting results are presented in Fig. 3a as symbols and solid lines, respectively. We fit the data of ρ vs. T in the temperature range from just above Tc to about 30 K with the general formula (equation 2). Here ρ0 represents the residual resistivity due to the impurity scattering. According to the Matthiessens’s rule, the composed resistivity can be written as:


Pressure Induced Enhancement of Superconductivity in LaRu2P2.

Li B, Lu P, Liu J, Sun J, Li S, Zhu X, Wen HH - Sci Rep (2016)

Fitting to the resistivity data under different pressures.(a) The electrical resistivity data and the fitting results under various pressures as shown by symbols and solid lines, respectively. The data of resistivity versus temperature is fitted in the temperature range of just above Tc to about 30 K with the general formula ρ = ρ0 + ATn, here ρ0 represents the residual resistivity due to the impurity scattering. The obtained coefficient ρ0, A, n under different pressures are presented in (b–d) respectively.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4834477&req=5

f3: Fitting to the resistivity data under different pressures.(a) The electrical resistivity data and the fitting results under various pressures as shown by symbols and solid lines, respectively. The data of resistivity versus temperature is fitted in the temperature range of just above Tc to about 30 K with the general formula ρ = ρ0 + ATn, here ρ0 represents the residual resistivity due to the impurity scattering. The obtained coefficient ρ0, A, n under different pressures are presented in (b–d) respectively.
Mentions: In order to get a deeper insight of the pressure induced enhancement of superconductivity, we take a look at the normal state resistivity under a pressure. The experimental data and the fitting results are presented in Fig. 3a as symbols and solid lines, respectively. We fit the data of ρ vs. T in the temperature range from just above Tc to about 30 K with the general formula (equation 2). Here ρ0 represents the residual resistivity due to the impurity scattering. According to the Matthiessens’s rule, the composed resistivity can be written as:

Bottom Line: The ab-initio calculation shows that the superconductivity in LaRu2P2 at ambient pressure can be explained by the McMillan's theory with strong electron-phonon coupling.Detailed analysis of the pressure induced evolution of resistivity and upper critical field Hc2(T) reveals that the increase of Tc with pressure may be accompanied by the involvement of extra electron-boson interaction.This suggests that the Ru-based system has some commonality as the Fe-based superconductors.

View Article: PubMed Central - PubMed

Affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, China.

ABSTRACT
To explore new superconductors beyond the copper-based and iron-based systems is very important. The Ru element locates just below the Fe in the periodic table and behaves like the Fe in many ways. One of the common thread to induce high temperature superconductivity is to introduce moderate correlation into the system. In this paper, we report the significant enhancement of superconducting transition temperature from 3.8 K to 5.8 K by using a pressure only of 1.74 ± 0.05 GPa in LaRu2P2 which has an iso-structure of the iron-based 122 superconductors. The ab-initio calculation shows that the superconductivity in LaRu2P2 at ambient pressure can be explained by the McMillan's theory with strong electron-phonon coupling. However, it is difficult to interpret the enhancement of Tc versus pressure within this picture. Detailed analysis of the pressure induced evolution of resistivity and upper critical field Hc2(T) reveals that the increase of Tc with pressure may be accompanied by the involvement of extra electron-boson interaction. This suggests that the Ru-based system has some commonality as the Fe-based superconductors.

No MeSH data available.