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

Tian, Long; Liu, Panpan; Hong, Tao; Seydel, Tilo; Lu, Xingye; Luo, Huiqian; Li, Shiliang; Dai, Pengcheng

doi:10.1088/1674-1056/ac0695

Title: Excess-iron driven spin glass phase in Fe_{1 + y}Te_{1 – x}Se_x

Journal Article · Fri May 07 00:00:00 EDT 2021 · Chinese Physics B

DOI:https://doi.org/10.1088/1674-1056/ac0695· OSTI ID:1817489

Tian, Long ^[1]; Liu, Panpan ^[1];

^[2]; Seydel, Tilo ^[3]; Lu, Xingye ^[1]; Luo, Huiqian ^[4]; Li, Shiliang ^[4]; Dai, Pengcheng ^[5]

Beijing Normal Univ. (China). Center for Advanced Quantum Studies
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Inst. Max von Laue-Paul Langevin, Grenoble (France)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics. Beijing National Lab. for Condensed Matter Physics (BNLCP-CAS)
Rice Univ., Houston, TX (United States)

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)Δlog₁₀ ω] ≈ 0.028 and the description of the critical slowing down with τ = τ₀(T_f/T_SG – 1)^{-z v} 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. We find that 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.

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)

Grant/Contract Number:: AC05-00OR22725; 11734002; 11922402; SC0012311

OSTI ID:: 1817489

Journal Information:: Chinese Physics B, Vol. 30, Issue 8; ISSN 1674-1056

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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

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Title: Excess-iron driven spin glass phase in Fe_{1 + y}Te_{1 – x}Se_x