Evolution of the superconductivity in pressurized La3-xSmxNi2O7
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arXiv
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2025
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| author | Zhong, Qingyi Chen, Junfeng Qiu, Zhengyang Li, Jingyuan Huang, Xing Ma, Peiyue Huo, Mengwu Dong, Hongliang Sun, Hualei Wang, Meng |
| author_facet | Zhong, Qingyi Chen, Junfeng Qiu, Zhengyang Li, Jingyuan Huang, Xing Ma, Peiyue Huo, Mengwu Dong, Hongliang Sun, Hualei Wang, Meng |
| contents | Motivated by the discovery of superconductivity in bilayer La$_3$Ni$_2$O$_7$ at 80 K and the increased superconducting transition temperature, $T_\text{c}$, up to 92 K in single crystals of La$_2$SmNi$_2$O$_7$ under pressure, we systematically study the effect of Sm doping on the superconductivity and structure of La$_{3-x}$Sm$_x$Ni$_2$O$_7$ (0 $\leq$ x $\leq$ 1.5) under pressure. Experimental investigations in polycrystalline samples reveal that Sm doping monotonically decreases the lattice constants $c$ and $a$, thereby enhancing crystal structure distortion and leading to an evolution of the metallic ground state in La$_3$Ni$_2$O$_7$ to an insulating state in La$_{1.5}$Sm$_{1.5}$Ni$_2$O$_7$. The maximum onset $T_\text{c}$ in compounds $x=0.9$ and 1.5 is 89 K, while the pressure that drives the emergence of superconductivity is higher for higher doping levels. The results suggest that the enhancement of $T_\text{c}$ in La$_{3-x}$Sm$_x$Ni$_2$O$_7$ is mainly affected by the compressed $c$ lattice before saturation, and the structure transition is critical for the emergence of superconductivity. Our experimental results provide insight into the influence of elemental substitution on nickelate superconductors, offering a means to increase the transition temperature further. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2510_13342 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Evolution of the superconductivity in pressurized La3-xSmxNi2O7 Zhong, Qingyi Chen, Junfeng Qiu, Zhengyang Li, Jingyuan Huang, Xing Ma, Peiyue Huo, Mengwu Dong, Hongliang Sun, Hualei Wang, Meng Superconductivity Strongly Correlated Electrons Motivated by the discovery of superconductivity in bilayer La$_3$Ni$_2$O$_7$ at 80 K and the increased superconducting transition temperature, $T_\text{c}$, up to 92 K in single crystals of La$_2$SmNi$_2$O$_7$ under pressure, we systematically study the effect of Sm doping on the superconductivity and structure of La$_{3-x}$Sm$_x$Ni$_2$O$_7$ (0 $\leq$ x $\leq$ 1.5) under pressure. Experimental investigations in polycrystalline samples reveal that Sm doping monotonically decreases the lattice constants $c$ and $a$, thereby enhancing crystal structure distortion and leading to an evolution of the metallic ground state in La$_3$Ni$_2$O$_7$ to an insulating state in La$_{1.5}$Sm$_{1.5}$Ni$_2$O$_7$. The maximum onset $T_\text{c}$ in compounds $x=0.9$ and 1.5 is 89 K, while the pressure that drives the emergence of superconductivity is higher for higher doping levels. The results suggest that the enhancement of $T_\text{c}$ in La$_{3-x}$Sm$_x$Ni$_2$O$_7$ is mainly affected by the compressed $c$ lattice before saturation, and the structure transition is critical for the emergence of superconductivity. Our experimental results provide insight into the influence of elemental substitution on nickelate superconductors, offering a means to increase the transition temperature further. |
| title | Evolution of the superconductivity in pressurized La3-xSmxNi2O7 |
| topic | Superconductivity Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2510.13342 |