Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe0.875Ti0.125)2As2

doi:10.1088/1674-1056/ae0d5a

中国物理B ›› 2025, Vol. 34 ›› Issue (12): 127401-127401.doi: 10.1088/1674-1056/ae0d5a

Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe_0.875Ti_0.125)₂As₂

Yi-Li Sun(孙毅丽)^1,2, Ze-Zhong Li(李泽众)^1,2, Yang Li(李阳)^1,2, Hong-Lin Zhou(周宏霖)¹, Amit Pokhriyal^3,4, Haranath Ghosh^3,4,†, Shi-Liang Li(李世亮)^1,2,‡, and Hui-Qian Luo(罗会仟)^1,§

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Theory and Computational Physics Section, Raja Ramanna Centre for Advanced Technology, Indore 452013, India;
4 Homi Bhabha National Institute, BARC training school complex 2nd floor, Anushakti Nagar, Mumbai 400094, India

收稿日期:2025-08-13 修回日期:2025-09-15 接受日期:2025-09-30 发布日期:2025-11-25
通讯作者: Haranath Ghosh, Shi-Liang Li, Hui-Qian Luo E-mail:hng@rrcat.gov.in;slli@iphy.ac.cn;hqluo@iphy.ac.cn
基金资助:
This work is supported by the National Key R&D Program of China (Grant Nos. 2023YFA1406100, 2022YFA1403800, 2022YFA1403400, and 2021YFA1400400), the National Natural Science Foundation of China (Grant Nos. 12274444 and 12574165), the Chinese Academy of Sciences (Grant No. XDB25000000). DFT calculations are performed at the HPC facilities at RRCAT. AP acknowledges financial support from HBNI-RRCAT.

Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe_0.875Ti_0.125)₂As₂

1 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 Theory and Computational Physics Section, Raja Ramanna Centre for Advanced Technology, Indore 452013, India;
4 Homi Bhabha National Institute, BARC training school complex 2nd floor, Anushakti Nagar, Mumbai 400094, India

Received:2025-08-13 Revised:2025-09-15 Accepted:2025-09-30 Published:2025-11-25
Contact: Haranath Ghosh, Shi-Liang Li, Hui-Qian Luo E-mail:hng@rrcat.gov.in;slli@iphy.ac.cn;hqluo@iphy.ac.cn
About author:2025-127401-251405.pdf
Supported by:
This work is supported by the National Key R&D Program of China (Grant Nos. 2023YFA1406100, 2022YFA1403800, 2022YFA1403400, and 2021YFA1400400), the National Natural Science Foundation of China (Grant Nos. 12274444 and 12574165), the Chinese Academy of Sciences (Grant No. XDB25000000). DFT calculations are performed at the HPC facilities at RRCAT. AP acknowledges financial support from HBNI-RRCAT.

摘要/Abstract

摘要： We report the crystal growth of a new hole-doped iron-based superconductor Ba(Fe$_{0.875}$Ti$_{0.125}$)$_2$As$_2$ by substituting Ti on the Fe site. The crystals are accidentally obtained in trying to grow Ni doped Ba$_2$Ti$_2$Fe$_2$As$_4$O. After annealing at 500~$^\circ$C in vacuum for one week, superconductivity is observed with zero resistance at $T_{\rm c0} \approx 17.5$ K, and about 20 % diamagnetic volume down to 2 K. While both the small anisotropy of superconductivity and the temperature dependence of normal state resistivity are akin to the electron doped 122-type compounds, the Hall coefficient is positive and similar to the case in hole-doped Ba$_{0.9}$K$_{0.1}$Fe$_2$As$_2$. The density functional theory calculations suggest dominated hole pockets contributed by Fe/Ti 3d orbitals. Therefore, the Ba(Fe$_{1-x}$Ti$_{x}$)$_2$As$_2$ system provides a new platform to study the superconductivity with hole doping on the Fe site of iron-based superconductors.

关键词: iron-based superconductors, crystal growth, flux method, hole-doped compounds

Abstract: We report the crystal growth of a new hole-doped iron-based superconductor Ba(Fe$_{0.875}$Ti$_{0.125}$)$_2$As$_2$ by substituting Ti on the Fe site. The crystals are accidentally obtained in trying to grow Ni doped Ba$_2$Ti$_2$Fe$_2$As$_4$O. After annealing at 500~$^\circ$C in vacuum for one week, superconductivity is observed with zero resistance at $T_{\rm c0} \approx 17.5$ K, and about 20 % diamagnetic volume down to 2 K. While both the small anisotropy of superconductivity and the temperature dependence of normal state resistivity are akin to the electron doped 122-type compounds, the Hall coefficient is positive and similar to the case in hole-doped Ba$_{0.9}$K$_{0.1}$Fe$_2$As$_2$. The density functional theory calculations suggest dominated hole pockets contributed by Fe/Ti 3d orbitals. Therefore, the Ba(Fe$_{1-x}$Ti$_{x}$)$_2$As$_2$ system provides a new platform to study the superconductivity with hole doping on the Fe site of iron-based superconductors.

Key words: iron-based superconductors, crystal growth, flux method, hole-doped compounds

中图分类号: (Properties of superconductors)

74.25.-q

74.25.Dw (Superconductivity phase diagrams) 74.70.-b (Superconducting materials other than cuprates)

Yi-Li Sun(孙毅丽), Ze-Zhong Li(李泽众), Yang Li(李阳), Hong-Lin Zhou(周宏霖), Amit Pokhriyal, Haranath Ghosh, Shi-Liang Li(李世亮), and Hui-Qian Luo(罗会仟). Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe_0.875Ti_0.125)₂As₂[J]. 中国物理B, 2025, 34(12): 127401-127401.

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Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe_0.875Ti_0.125)₂As₂

Crystal growth and characterization of a hole-doped iron-based superconductor Ba(Fe_0.875Ti_0.125)₂As₂

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