Crystal structures and sign reversal Hall resistivities in iron-based superconductors Lix(C3H10N2)0.32FeSe (0.15 < x < 0.4)

doi:10.1088/1674-1056/28/6/067401

中国物理B ›› 2019, Vol. 28 ›› Issue (6): 67401-067401.doi: 10.1088/1674-1056/28/6/067401

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Crystal structures and sign reversal Hall resistivities in iron-based superconductors Li_x(C₃H₁₀N₂)_0.32FeSe (0.15 < x < 0.4)

Rui-Jin Sun(孙瑞锦), Shi-Feng Jin(金士锋), Jun Deng(邓俊), Mu-Nan Hao(郝木难), Lin-Lin Zhao(赵琳琳), Xiao Fan(范晓), Xiao-Ning Sun(孙晓宁), Jian-Gang Guo(郭建刚), Lin Gu(谷林)

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 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, China

收稿日期:2019-03-08 修回日期:2019-04-10 出版日期:2019-06-05 发布日期:2019-06-05
通讯作者: Shi-Feng Jin, Lin Gu E-mail:shifengjin@iphy.ac.cn;l.gu@iphy.ac.cn
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51472266, 51532010, 91422303, and 51772323), the National Key Research and Development Program of China (Grant No. 2016YFA0300301), and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. QYZDJ-SSW-SLH013).

Crystal structures and sign reversal Hall resistivities in iron-based superconductors Li_x(C₃H₁₀N₂)_0.32FeSe (0.15 < x < 0.4)

Rui-Jin Sun(孙瑞锦)^1,2, Shi-Feng Jin(金士锋)^1,3, Jun Deng(邓俊)^1,2, Mu-Nan Hao(郝木难)^1,2, Lin-Lin Zhao(赵琳琳)^1,2, Xiao Fan(范晓)^1,2, Xiao-Ning Sun(孙晓宁)^1,2, Jian-Gang Guo(郭建刚)^1,2, Lin Gu(谷林)^1,2

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 School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 101408, China

Received:2019-03-08 Revised:2019-04-10 Online:2019-06-05 Published:2019-06-05
Contact: Shi-Feng Jin, Lin Gu E-mail:shifengjin@iphy.ac.cn;l.gu@iphy.ac.cn
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 51472266, 51532010, 91422303, and 51772323), the National Key Research and Development Program of China (Grant No. 2016YFA0300301), and the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (Grant No. QYZDJ-SSW-SLH013).

摘要/Abstract

摘要：

Heavy electron-doped FeSe-derived materials have attracted attention due to their uncommon electronic structures with only ‘electron pockets’, and they are different from other iron-based superconductors. Here, we report the crystal structures, superconductivities and normal state properties of two new Li-doped FeSe-based materials, i.e., Li_0.15(C₃H₁₀N₂)_0.32FeSe (P-4) and Li_x(C₃H₁₀N₂)_0.32FeSe (P4/nmm, 0.25 < x < 0.4) with superconducting transition temperatures ranging from 40 K to 46 K. The determined crystal structures reveal a coupling between Li concentration and the orientation of 1,3-diaminopropane molecules within the largely expanded FeSe layers. Superconducting fluctuations appear in the resistivity of the two superconductors and are fitted in terms of the quasi two-dimensional (2D) Lawrence-Doniach model. The existence of a crossing point and scaling behavior in the T-dependence of diamagnetic response also suggests that the two superconductors belong to the quasi-2D system. Interestingly, with the increase of temperature, a sign of Hall coefficient (R_H) reversing from negative to positive is observed at~185 K in both phases, suggesting that ‘hole pockets’ emerge in these electron-doped FeSe materials. First principle calculations indicate that the increase in FeSe layer distance will lift up a ‘hole band’ associated with d_x²-y² character and increase the hole carriers. Our findings suggest that the increase in two dimensionalities may lead to the sign-reversal Hall resistivity in Li_x(C₃H₁₀N₂)_0.32FeSe at high temperature.

关键词: superconductor, Lawrence-Doniach model, dimensionality

Abstract:

Key words: superconductor, Lawrence-Doniach model, dimensionality

中图分类号: (Superconducting materials other than cuprates)

74.70.-b

74.70.Xa (Pnictides and chalcogenides)

孙瑞锦, 金士锋, 邓俊, 郝木难, 赵琳琳, 范晓, 孙晓宁, 郭建刚, 谷林. Crystal structures and sign reversal Hall resistivities in iron-based superconductors Li_x(C₃H₁₀N₂)_0.32FeSe (0.15 < x < 0.4)[J]. 中国物理B, 2019, 28(6): 67401-067401.

Rui-Jin Sun(孙瑞锦), Shi-Feng Jin(金士锋), Jun Deng(邓俊), Mu-Nan Hao(郝木难), Lin-Lin Zhao(赵琳琳), Xiao Fan(范晓), Xiao-Ning Sun(孙晓宁), Jian-Gang Guo(郭建刚), Lin Gu(谷林). Crystal structures and sign reversal Hall resistivities in iron-based superconductors Li_x(C₃H₁₀N₂)_0.32FeSe (0.15 < x < 0.4)[J]. Chin. Phys. B, 2019, 28(6): 67401-067401.

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Crystal structures and sign reversal Hall resistivities in iron-based superconductors Li_x(C₃H₁₀N₂)_0.32FeSe (0.15 < x < 0.4)

Crystal structures and sign reversal Hall resistivities in iron-based superconductors Li_x(C₃H₁₀N₂)_0.32FeSe (0.15 < x < 0.4)

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