Superstructures and magnetic order in heavily Cu-substituted ( Fe 1 – x Cu x ) 1 + y Te
Journal Article
·
· Physical Review. B
- Zhejiang Univ., Hangzhou (China)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); National Institute for Materials Science (NIMS), Tsukuba (Japan). Research Center for Electronic and Optical Materials
- Beijing Normal University, Beijing (China)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Yale Univ., New Haven, CT (United States); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Zhejiang Univ., Hangzhou (China); Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Most iron-based superconductors exhibit stripe-type magnetism, characterized by the ordering vector Q = ($$\frac{1}{2},\frac{1}{2}$$). In contrast, Fe1+yTe, the parent compound of the Fe1+yTe1–xSex superconductors, exhibits double-stripe magnetic order associated with the ordering vector Q = ($$\frac{1}{2},0$$). Here, we use elastic neutron scattering to investigate heavily Cu-substituted (Fe1–xCux)1+yTe compounds and reveal that (1) for x ≳ 0.4, short-range magnetic order emerges around the stripe-type vector at Q = ($$\frac{1}{2}$$ ± δ, $$\frac{1}{2}$$ ± δ, $$\frac{1}{2}$$) with δ ≈ 0.05; (2) the short-range magnetic order is associated with a superstructure modulation at Q = ($$\frac{1}{3},\frac{1}{3},\frac{1}{2}$$), with the magnetic correlation length shorter than that for the superstructure; and (3) for x ≳ 0.55, we observe an additional intergrown phase with higher Cu content, characterized by a superstructure modulation vector Q = ($$\frac{1}{3},\frac{1}{3},0$$) and magnetic peaks at Q = ($$\frac{2}{3},\frac{1}{3},\frac{1}{2}$$)/($$\frac{1}{3},\frac{2}{3},\frac{1}{2}$$). The positions of superstructure peaks suggest that relative to the tetragonal unit cell of Fe1+yTe, heavy Cu substitution leads to Fe-Cu orderings that expand the unit cell by $$\sqrt{2}$$ × 3$$\sqrt{2}$$ times in the ab plane, corroborated by first-principles calculations that suggest the formation of spin chains and spin ladders. Finally, our findings show that stripe-type magnetism is common in magnetically diluted iron pnictides and chalcogenides, despite the varying associated atomic orderings
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
- Sponsoring Organization:
- Key Research and Development Program of Zhejiang Province; National Key Research and Development Program of China; National Natural Science Foundation of China (NSFC); Pioneer and Leading Goose Research and Development Program of Zhejiang; USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
- Grant/Contract Number:
- AC02-05CH11231; AC05-00OR22725
- OSTI ID:
- 2426067
- Alternate ID(s):
- OSTI ID: 2453881
OSTI ID: 2474357
- Journal Information:
- Physical Review. B, Journal Name: Physical Review. B Journal Issue: 4 Vol. 109; ISSN 2469-9950
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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