Excess-iron driven spin glass phase in Fe1+yTe1-xSex

doi:10.1088/1674-1056/ac0695

中国物理B ›› 2021, Vol. 30 ›› Issue (8): 87402-087402.doi: 10.1088/1674-1056/ac0695

Excess-iron driven spin glass phase in Fe_1+yTe_1-xSe_x

Long Tian(田龙)¹, Panpan Liu(刘盼盼)¹, Tao Hong(洪涛)², Tilo Seydel³, Xingye Lu(鲁兴业)^1,†, Huiqian Luo(罗会仟)⁴, Shiliang Li(李世亮)⁴, and Pengcheng Dai(戴鹏程)^5,‡

1 Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China;
2 Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;
3 Institut Max von Laue-Paul Langevin(ILL), 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France;
4 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
5 Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA

收稿日期:2021-05-07 修回日期:2021-05-25 接受日期:2021-05-29 出版日期:2021-07-16 发布日期:2021-07-23
通讯作者: Xingye Lu, Pengcheng Dai E-mail:luxy@bnu.edu.cn;pdai@rice.edu
基金资助:
The work at Beijing Normal University is supported by the National Natural Science Foundation of China (Grant Nos. 11734002 and 11922402, X.L.). Work at Rice is supported by the US Department of Energy (DOE), Basic Energy Sciences (BES), under Contract No. DE-SC0012311 (P.D.). A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

Excess-iron driven spin glass phase in Fe_1+yTe_1-xSe_x

Long Tian(田龙)¹, Panpan Liu(刘盼盼)¹, Tao Hong(洪涛)², Tilo Seydel³, Xingye Lu(鲁兴业)^1,†, Huiqian Luo(罗会仟)⁴, Shiliang Li(李世亮)⁴, and Pengcheng Dai(戴鹏程)^5,‡

1 Center for Advanced Quantum Studies and Department of Physics, Beijing Normal University, Beijing 100875, China;
2 Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA;
3 Institut Max von Laue-Paul Langevin(ILL), 71 Avenue des Martyrs, CS 20156, 38042 Grenoble Cedex 9, France;
4 Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
5 Department of Physics and Astronomy, Rice University, Houston, TX 77005, USA

Received:2021-05-07 Revised:2021-05-25 Accepted:2021-05-29 Online:2021-07-16 Published:2021-07-23
Contact: Xingye Lu, Pengcheng Dai E-mail:luxy@bnu.edu.cn;pdai@rice.edu
Supported by:
The work at Beijing Normal University is supported by the National Natural Science Foundation of China (Grant Nos. 11734002 and 11922402, X.L.). Work at Rice is supported by the US Department of Energy (DOE), Basic Energy Sciences (BES), under Contract No. DE-SC0012311 (P.D.). A portion of this research used resources at the High Flux Isotope Reactor, a DOE Office of Science User Facility operated by the Oak Ridge National Laboratory.

摘要/Abstract

摘要： The iron-chalcogenide superconductor FeTe_1-xSe_x displays a variety of exotic features distinct from iron pnictides. Although much effort has been devoted to understanding the interplay between magnetism and superconductivity near x=0.5, the existence of a spin glass phase with short-range magnetic order in the doping range (x～0.1-0.3) has rarely been studied. Here, we use DC/AC magnetization and (quasi) elastic neutron scattering to confirm the spin-glass nature of the short-range magnetic order in a Fe_1.07Te_0.8Se_0.2 sample. The AC-frequency dependent spin-freezing temperature T_f generates a frequency sensitivity ΔT_f(ω) /[T_f(ω) Δlog₁₀ω]≈0.028 and the description of the critical slowing down with τ=τ₀(T_f / T_SG)^-zv gives T_SG≈22 K and zv≈10, comparable to that of a classical spin-glass system. We have also extended the frequency-dependent T_f to the smaller time scale using energy-resolution-dependent neutron diffraction measurements, in which the T_N of the short-range magnetic order increases systematically with increasing energy resolution. By removing the excess iron through annealing in oxygen, the spin-freezing behavior disappears, and bulk superconductivity is realized. Thus, the excess Fe is the driving force for the formation of the spin-glass phase detrimental to bulk superconductivity.

关键词: iron chalcogenides, spin glass, neutron scattering

Abstract: The iron-chalcogenide superconductor FeTe_1-xSe_x displays a variety of exotic features distinct from iron pnictides. Although much effort has been devoted to understanding the interplay between magnetism and superconductivity near x=0.5, the existence of a spin glass phase with short-range magnetic order in the doping range (x～0.1-0.3) has rarely been studied. Here, we use DC/AC magnetization and (quasi) elastic neutron scattering to confirm the spin-glass nature of the short-range magnetic order in a Fe_1.07Te_0.8Se_0.2 sample. The AC-frequency dependent spin-freezing temperature T_f generates a frequency sensitivity ΔT_f(ω) /[T_f(ω) Δlog₁₀ω]≈0.028 and the description of the critical slowing down with τ=τ₀(T_f / T_SG)^-zv gives T_SG≈22 K and zv≈10, comparable to that of a classical spin-glass system. We have also extended the frequency-dependent T_f to the smaller time scale using energy-resolution-dependent neutron diffraction measurements, in which the T_N of the short-range magnetic order increases systematically with increasing energy resolution. By removing the excess iron through annealing in oxygen, the spin-freezing behavior disappears, and bulk superconductivity is realized. Thus, the excess Fe is the driving force for the formation of the spin-glass phase detrimental to bulk superconductivity.

Key words: iron chalcogenides, spin glass, neutron scattering

中图分类号: (Pnictides and chalcogenides)

74.70.Xa

75.30.Gw (Magnetic anisotropy) 78.70.Nx (Neutron inelastic scattering)

Long Tian(田龙), Panpan Liu(刘盼盼), Tao Hong(洪涛), Tilo Seydel, Xingye Lu(鲁兴业), Huiqian Luo(罗会仟), Shiliang Li(李世亮), and Pengcheng Dai(戴鹏程). Excess-iron driven spin glass phase in Fe_1+yTe_1-xSe_x[J]. 中国物理B, 2021, 30(8): 87402-087402.

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Excess-iron driven spin glass phase in Fe_1+yTe_1-xSe_x

Excess-iron driven spin glass phase in Fe_1+yTe_1-xSe_x

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