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Most iron-based superconductors exhibit stripe-type magnetism, characterized by the ordering vector Q = . In contrast, Fe1+yTe, the parent compound of the Fe1+yTe1−xSex superconductors, exhibits double-stripe magnetic order associated with the ordering vector Q = . 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 = (x) with δ ≈ 0.05; (2)the short-range magnetic order is associated with a superstructure modulation at Q = , 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 = and magnetic peaks at Q = . 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 √2× 3√2 times in the ab plane, corroborated by first-principles calculations that suggest the formation of spin chains and spin ladders. Our findings show that stripe-type magnetism is common in magnetically diluted iron pnictides and chalcogenides, despite the varying associated atomic orderings.

Description:

Most iron-based superconductors exhibit stripe-type magnetism, characterized by the ordering vector Q = . In contrast, Fe1+yTe, the parent compound of the Fe1+yTe1−xSex superconductors, exhibits double-stripe magnetic order associated with the ordering vector Q = . 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 = (x) with δ ≈ 0.05; (2)the short-range magnetic order is associated with a superstructure modulation at Q = , 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 = and magnetic peaks at Q = . 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 √2× 3√2 times in the ab plane, corroborated by first-principles calculations that suggest the formation of spin chains and spin ladders. Our findings show that stripe-type magnetism is common in magnetically diluted iron pnictides and chalcogenides, despite the varying associated atomic orderings.

Description:

Most iron-based superconductors exhibit stripe-type magnetism, characterized by the ordering vector Q = . In contrast, Fe1+yTe, the parent compound of the Fe1+yTe1−xSex superconductors, exhibits double-stripe magnetic order associated with the ordering vector Q = . 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 = (x) with δ ≈ 0.05; (2)the short-range magnetic order is associated with a superstructure modulation at Q = , 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 = and magnetic peaks at Q = . 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 √2× 3√2 times in the ab plane, corroborated by first-principles calculations that suggest the formation of spin chains and spin ladders. Our findings show that stripe-type magnetism is common in magnetically diluted iron pnictides and chalcogenides, despite the varying associated atomic orderings.

Description:

Most iron-based superconductors exhibit stripe-type magnetism, characterized by the ordering vector Q = . In contrast, Fe1+yTe, the parent compound of the Fe1+yTe1−xSex superconductors, exhibits double-stripe magnetic order associated with the ordering vector Q = . 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 = (x) with δ ≈ 0.05; (2)the short-range magnetic order is associated with a superstructure modulation at Q = , 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 = and magnetic peaks at Q = . 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 √2× 3√2 times in the ab plane, corroborated by first-principles calculations that suggest the formation of spin chains and spin ladders. Our findings show that stripe-type magnetism is common in magnetically diluted iron pnictides and chalcogenides, despite the varying associated atomic orderings.

Description:

Most iron-based superconductors exhibit stripe-type magnetism, characterized by the ordering vector Q = . In contrast, Fe1+yTe, the parent compound of the Fe1+yTe1−xSex superconductors, exhibits double-stripe magnetic order associated with the ordering vector Q = . 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 = (x) with δ ≈ 0.05; (2)the short-range magnetic order is associated with a superstructure modulation at Q = , 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 = and magnetic peaks at Q = . 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 √2× 3√2 times in the ab plane, corroborated by first-principles calculations that suggest the formation of spin chains and spin ladders. Our findings show that stripe-type magnetism is common in magnetically diluted iron pnictides and chalcogenides, despite the varying associated atomic orderings.

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Keyword: Magnetic order, Structural properties, Iron-based superconductors, Neutron scattering

Date published: 2024-01-23

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Journal:

• PHYSICAL REVIEW B (ISSN: 24699950) vol. 109 issue. 4 045142

Funding:

• Zhejiang University
• National Key Research and Development Program of China 2022YFA1402200
• National Key Research and Development Program of China 2021C01002
• Beijing Normal University
• National Natural Science Foundation of China 12274363
• National Natural Science Foundation of China 12274364
• National Natural Science Foundation of China 12174029
• University of California
• Lawrence Berkeley National Laboratory
• Office of Science
• Basic Energy Sciences
• U.S. Department of Energy DE-AC02-05-CH11231
• Oak Ridge National Laboratory

Manuscript type: Author's version (Submitted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4991

First published URL: https://doi.org/10.1103/physrevb.109.045142

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Updated at: 2024-12-24 12:09:02 +0900

Published on MDR: 2024-11-19 16:30:51 +0900