Structural transition and anisotropic magnetism in disordered Zintl phase Eu7Ga6Sb8

Matthew S. Cook; Elizabeth A. Peterson; Clément Girod; Ashley Weiland; Jian Xin Zhu; J. D. Thompson; Sean M. Thomas; Priscila F.S. Rosa

doi:10.1103/PhysRevMaterials.7.094601

Structural transition and anisotropic magnetism in disordered Zintl phase Eu7Ga6Sb8

Matthew S. Cook
, Elizabeth A. Peterson
, Clément Girod
, Ashley Weiland
, Jian Xin Zhu
, J. D. Thompson
, Sean M. Thomas
, Priscila F.S. Rosa

Correlated Electron Materials

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

1 Scopus citations

Abstract

Single crystals of the Zintl compound Eu7Ga6Sb8 were synthesized using a Ga-Sb flux. We report the temperature (T) and magnetic field (H) dependence of the magnetic susceptibility (χ), magnetization (M), resistivity (ρ), specific heat (C), and thermal expansion (α). We also report high-resolution powder x-ray diffraction data that support a structural phase transition with accompanying signatures seen in C(T), ρ(T), and α(T). We find Eu7Ga6Sb8 exhibits antiferromagnetic ordering at TN1=9.0 K from anomalies seen in χ(T), C(T), and α(T), as well as a potential reorientation of Eu2+ spins at TN2=7.5 K and TN3=7.2 K. Density functional theory calculations predict Eu7Ga6Sb8 to be semiconducting; however, electrical resistivity measurements show bad-metal behavior that indicates the presence of disorder.

Original language	English
Article number	094601
Journal	Physical Review Materials
Volume	7
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevMaterials.7.094601
State	Published - Sep 2023

Funding

Work at Los Alamos National Laboratory was performed under the auspices of the U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Science and Engineering. Scanning electron microscope and energy-dispersive x-ray measurements were performed at the Center for Integrated Nanotechnologies, an Office of Science User Facility operated for the U.S. Department of Energy Office of Science. Computational resources were supported by the Center for Integrated Nanotechnologies, a DOE Office of Science user facility, in partnership with the LANL Institutional Computing Program for computational resources. Additional computations were performed at the National Energy Research Scientific Computing Center (NERSC), a U.S. Department of Energy Office of Science user facility located at Lawrence Berkeley National Laboratory, operated under Contract No. DE-AC02-05CH11231 using NERSC Award No. ERCAP0020494. This research used resources of the Advanced Photon Source, a U.S. Department of Energy (DOE) Office of Science user facility operated for the DOE Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357. M.S.C. acknowledges support from the Laboratory Directed Research and Development program.

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10.1103/PhysRevMaterials.7.094601

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title = "Structural transition and anisotropic magnetism in disordered Zintl phase Eu7Ga6Sb8",

abstract = "Single crystals of the Zintl compound Eu7Ga6Sb8 were synthesized using a Ga-Sb flux. We report the temperature (T) and magnetic field (H) dependence of the magnetic susceptibility (χ), magnetization (M), resistivity (ρ), specific heat (C), and thermal expansion (α). We also report high-resolution powder x-ray diffraction data that support a structural phase transition with accompanying signatures seen in C(T), ρ(T), and α(T). We find Eu7Ga6Sb8 exhibits antiferromagnetic ordering at TN1=9.0 K from anomalies seen in χ(T), C(T), and α(T), as well as a potential reorientation of Eu2+ spins at TN2=7.5 K and TN3=7.2 K. Density functional theory calculations predict Eu7Ga6Sb8 to be semiconducting; however, electrical resistivity measurements show bad-metal behavior that indicates the presence of disorder.",

author = "Cook, \{Matthew S.\} and Peterson, \{Elizabeth A.\} and Cl{\'e}ment Girod and Ashley Weiland and Zhu, \{Jian Xin\} and Thompson, \{J. D.\} and Thomas, \{Sean M.\} and Rosa, \{Priscila F.S.\}",

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T1 - Structural transition and anisotropic magnetism in disordered Zintl phase Eu7Ga6Sb8

AU - Cook, Matthew S.

AU - Peterson, Elizabeth A.

AU - Girod, Clément

AU - Weiland, Ashley

AU - Zhu, Jian Xin

AU - Thompson, J. D.

AU - Thomas, Sean M.

AU - Rosa, Priscila F.S.

PY - 2023/9

Y1 - 2023/9

N2 - Single crystals of the Zintl compound Eu7Ga6Sb8 were synthesized using a Ga-Sb flux. We report the temperature (T) and magnetic field (H) dependence of the magnetic susceptibility (χ), magnetization (M), resistivity (ρ), specific heat (C), and thermal expansion (α). We also report high-resolution powder x-ray diffraction data that support a structural phase transition with accompanying signatures seen in C(T), ρ(T), and α(T). We find Eu7Ga6Sb8 exhibits antiferromagnetic ordering at TN1=9.0 K from anomalies seen in χ(T), C(T), and α(T), as well as a potential reorientation of Eu2+ spins at TN2=7.5 K and TN3=7.2 K. Density functional theory calculations predict Eu7Ga6Sb8 to be semiconducting; however, electrical resistivity measurements show bad-metal behavior that indicates the presence of disorder.

AB - Single crystals of the Zintl compound Eu7Ga6Sb8 were synthesized using a Ga-Sb flux. We report the temperature (T) and magnetic field (H) dependence of the magnetic susceptibility (χ), magnetization (M), resistivity (ρ), specific heat (C), and thermal expansion (α). We also report high-resolution powder x-ray diffraction data that support a structural phase transition with accompanying signatures seen in C(T), ρ(T), and α(T). We find Eu7Ga6Sb8 exhibits antiferromagnetic ordering at TN1=9.0 K from anomalies seen in χ(T), C(T), and α(T), as well as a potential reorientation of Eu2+ spins at TN2=7.5 K and TN3=7.2 K. Density functional theory calculations predict Eu7Ga6Sb8 to be semiconducting; however, electrical resistivity measurements show bad-metal behavior that indicates the presence of disorder.

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Structural transition and anisotropic magnetism in disordered Zintl phase Eu7Ga6Sb8

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