Evidence of Nematicity in K0.8Fe1.7Se2

Chunruo Duan; Junjie Yang; Feng Ye; Despina Louca

doi:10.1007/s10948-015-3327-8

Evidence of Nematicity in K_0.8Fe_1.7Se₂

Chunruo Duan, Junjie Yang, Feng Ye, Despina Louca

Single Crystal Diffraction

University of Virginia School of Engineering and Applied Science

Research output: Contribution to journal › Article › peer-review

2 Scopus citations

Abstract

It has been proposed that the superconducting state of K_0.8Fe_1.7Se₂ is phase separated from a non-superconducting magnetic state. The results from a recent neutron diffraction study on a single crystal of K_0.8Fe_1.7Se₂ provide evidence for a continuous transition between the I4/mmm high temperature phase in which the Fe vacancies are randomly distributed and the I4/m vacancy ordered phase in the temperature range between T_C and T_S. Upon cooling, the I4/m phase becomes more populated, increasing the (Formula presented.) superlattice structure, resulting in an enhancement of the (101) superlattice peak. The same temperature dependence is observed for the magnetic peak as well. Moreover, due to the Fe site splitting with the transition, its z-coordinate fluctuates, and so must the d_xz and d_yz orbitals. The orbital fluctuations couple to the magnetic ordering as seen here and may lead to a realization of nematic order in this system.

Original language	English
Pages (from-to)	663-666
Number of pages	4
Journal	Journal of Superconductivity and Novel Magnetism
Volume	29
Issue number	3
DOIs	https://doi.org/10.1007/s10948-015-3327-8
State	Published - Mar 1 2016

Bibliographical note

Publisher Copyright:
© 2015, Springer Science+Business Media New York.

Keywords

Nematic phase
Neutron scattering
Superconductivity
Vacancies

Access to Document

10.1007/s10948-015-3327-8

Cite this

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title = "Evidence of Nematicity in K0.8Fe1.7Se2 ",

abstract = "It has been proposed that the superconducting state of K0.8Fe1.7Se2 is phase separated from a non-superconducting magnetic state. The results from a recent neutron diffraction study on a single crystal of K0.8Fe1.7Se2 provide evidence for a continuous transition between the I4/mmm high temperature phase in which the Fe vacancies are randomly distributed and the I4/m vacancy ordered phase in the temperature range between TC and TS. Upon cooling, the I4/m phase becomes more populated, increasing the (Formula presented.) superlattice structure, resulting in an enhancement of the (101) superlattice peak. The same temperature dependence is observed for the magnetic peak as well. Moreover, due to the Fe site splitting with the transition, its z-coordinate fluctuates, and so must the dxz and dyz orbitals. The orbital fluctuations couple to the magnetic ordering as seen here and may lead to a realization of nematic order in this system.",

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AU - Ye, Feng

AU - Louca, Despina

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N2 - It has been proposed that the superconducting state of K0.8Fe1.7Se2 is phase separated from a non-superconducting magnetic state. The results from a recent neutron diffraction study on a single crystal of K0.8Fe1.7Se2 provide evidence for a continuous transition between the I4/mmm high temperature phase in which the Fe vacancies are randomly distributed and the I4/m vacancy ordered phase in the temperature range between TC and TS. Upon cooling, the I4/m phase becomes more populated, increasing the (Formula presented.) superlattice structure, resulting in an enhancement of the (101) superlattice peak. The same temperature dependence is observed for the magnetic peak as well. Moreover, due to the Fe site splitting with the transition, its z-coordinate fluctuates, and so must the dxz and dyz orbitals. The orbital fluctuations couple to the magnetic ordering as seen here and may lead to a realization of nematic order in this system.

AB - It has been proposed that the superconducting state of K0.8Fe1.7Se2 is phase separated from a non-superconducting magnetic state. The results from a recent neutron diffraction study on a single crystal of K0.8Fe1.7Se2 provide evidence for a continuous transition between the I4/mmm high temperature phase in which the Fe vacancies are randomly distributed and the I4/m vacancy ordered phase in the temperature range between TC and TS. Upon cooling, the I4/m phase becomes more populated, increasing the (Formula presented.) superlattice structure, resulting in an enhancement of the (101) superlattice peak. The same temperature dependence is observed for the magnetic peak as well. Moreover, due to the Fe site splitting with the transition, its z-coordinate fluctuates, and so must the dxz and dyz orbitals. The orbital fluctuations couple to the magnetic ordering as seen here and may lead to a realization of nematic order in this system.

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