Structure, chromium vacancies, and magnetism in a Cr12-xTe16 compound

Cao, Guixin; Zhang, Qiang; Frontzek, Matthias D.; Xie, Weiwei; Gong, Dongliang; Sterbinsky, George E.; Jin, Rongying

doi:10.1103/PhysRevMaterials.3.125001

Title: Structure, chromium vacancies, and magnetism in a $C r_{12 - x} T e_{16}$ compound

Journal Article · 16 December 2019 · Physical Review Materials

DOI: https://doi.org/10.1103/PhysRevMaterials.3.125001 · OSTI ID:1606879

Cao, Guixin ^[1];

^[2];

^[3]; Xie, Weiwei ^[1]; Gong, Dongliang ^[1]; Sterbinsky, George E. ^[4]; Jin, Rongying ^[1]

Louisiana State Univ., Baton Rouge, LA (United States)
Louisiana State Univ., Baton Rouge, LA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Binary Cr-Te compounds are known to exhibit various structures and interesting physical properties, which are very sensitive to Cr content and arrangement. We report the structure and physical properties of a compound Cr_12-xTe₁₆ with x similar to 2.65. Cr_9.35Te₁₆ crystallizes in the trigonal structure with the space group $$P\bar{3}m$$1 (No. 164), consisting of four different Cr sites (Cr1, Cr2, Cr3, Cr4) with an ordered Cr4 vacant layer. The electrical resistivity, magnetization, specific heat, and neutron diffraction measurements indicate that there is a ferromagnetic transition at T_C1 similar to 160 K with the first-order nature, and an anomaly at T_C2 similar to 67 K. At 5 K, the magnetic moments of Cr2 and Cr3 are aligned along the c axis with 2.78 μ_B/Cr. Detailed neutron diffraction refinement suggests that ordered magnetic moments on Cr1 (fully occupied) and Cr4 (partially occupied) are negligible. The different magnetic response stems from different valence states and different magnetic interactions between Cr2/Cr3 and Cr1/Cr4 as evidenced by the x-ray absorption fine-structure measurements. This creates a unique two-dimensional magnetic system with ordered moments confined in the Cr2/Cr3 layer.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Louisiana State Univ., Baton Rouge, LA (United States); Argonne National Laboratory (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; SC0012432; AC02-06CH11357

OSTI ID:: 1606879

Alternate ID(s):: OSTI ID: 1608555; OSTI ID: 1678703

Journal Information:: Physical Review Materials, Vol. 3, Issue 12; ISSN 2475-9953

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 6 works

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References (35)

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Title: Structure, chromium vacancies, and magnetism in a C r 12 - x T e 16 compound

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Title: Structure, chromium vacancies, and magnetism in a $C r_{12 - x} T e_{16}$ compound