Possible Mott transition in layered Sr2Mn3As2 O2 single crystals

Chih Wei Chen; Weiyi Wang; Vaideesh Loganathan; Scott V. Carr; Leland W. Harriger; C. Georgen; Andriy H. Nevidomskyy; Pengcheng Dai; C. L. Huang; E. Morosan

doi:10.1103/PhysRevB.99.144423

Possible Mott transition in layered Sr2Mn3As2 O2 single crystals

Chih Wei Chen, Weiyi Wang, Vaideesh Loganathan, Scott V. Carr, Leland W. Harriger, C. Georgen, Andriy H. Nevidomskyy, Pengcheng Dai, C. L. Huang, E. Morosan

Department of Physics

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

Abstract

Single crystals of Sr2Mn3As2O2 have been grown for the first time, for which we show a possible layer-selective Mott insulator behavior. This compound stands out as a hybrid structure of MnO2 and MnAs layers, analogously to the active CuO2 and FeAs layers, respectively, in the cuprate and iron-based high-temperature superconductors. Electrical transport, neutron diffraction measurements, together with density functional theory calculations on Sr2Mn3As2O2 single crystals converge toward a picture of independent magnetic order at T1∼79 K and T2∼360 K for the two Mn sublattices, with insulating behavior at odds with the metallic behavior predicted by calculations. Furthermore, our inelastic neutron-scattering studies of spin-wave dispersions for the Mn(1) sublattice reveal an effective magnetic exchange coupling of SJ∼3.7 meV. This is much smaller than those for the Mn(2) sublattice.

Original language	English
Article number	144423
Journal	Physical Review B
Volume	99
Issue number	14
DOIs	https://doi.org/10.1103/PhysRevB.99.144423
Publication status	Published - 2019 Apr 24

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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@article{41a3d037c53d442b85c3f85f074514aa,

title = "Possible Mott transition in layered Sr2Mn3As2 O2 single crystals",

abstract = "Single crystals of Sr2Mn3As2O2 have been grown for the first time, for which we show a possible layer-selective Mott insulator behavior. This compound stands out as a hybrid structure of MnO2 and MnAs layers, analogously to the active CuO2 and FeAs layers, respectively, in the cuprate and iron-based high-temperature superconductors. Electrical transport, neutron diffraction measurements, together with density functional theory calculations on Sr2Mn3As2O2 single crystals converge toward a picture of independent magnetic order at T1∼79 K and T2∼360 K for the two Mn sublattices, with insulating behavior at odds with the metallic behavior predicted by calculations. Furthermore, our inelastic neutron-scattering studies of spin-wave dispersions for the Mn(1) sublattice reveal an effective magnetic exchange coupling of SJ∼3.7 meV. This is much smaller than those for the Mn(2) sublattice.",

author = "Chen, {Chih Wei} and Weiyi Wang and Vaideesh Loganathan and Carr, {Scott V.} and Harriger, {Leland W.} and C. Georgen and Nevidomskyy, {Andriy H.} and Pengcheng Dai and Huang, {C. L.} and E. Morosan",

note = "Funding Information: C.-W.C., C.G., C.-L.H., and E.M. acknowledge support from the Gordon and Betty Moore Foundation's EPiQS initiative through Grant No. GBMF 4417. The theoretical work by V.L. and A.H.N. was supported by the Welch Foundation Grant No. C-1818. A.H.N. also acknowledges support from the National Science Foundation Grant No. DMR-1350237. The neutron-scattering work by P.D. is supported by the United States DOE, BES, through Contract No. DE-SC0012311. Part of the work at Rice University is supported by the Robert A. Welch Foundation through Grant No. C-1839 (P.D.).",

year = "2019",

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doi = "10.1103/PhysRevB.99.144423",

language = "English",

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T1 - Possible Mott transition in layered Sr2Mn3As2 O2 single crystals

AU - Chen, Chih Wei

AU - Wang, Weiyi

AU - Loganathan, Vaideesh

AU - Carr, Scott V.

AU - Harriger, Leland W.

AU - Georgen, C.

AU - Nevidomskyy, Andriy H.

AU - Dai, Pengcheng

AU - Huang, C. L.

AU - Morosan, E.

N1 - Funding Information: C.-W.C., C.G., C.-L.H., and E.M. acknowledge support from the Gordon and Betty Moore Foundation's EPiQS initiative through Grant No. GBMF 4417. The theoretical work by V.L. and A.H.N. was supported by the Welch Foundation Grant No. C-1818. A.H.N. also acknowledges support from the National Science Foundation Grant No. DMR-1350237. The neutron-scattering work by P.D. is supported by the United States DOE, BES, through Contract No. DE-SC0012311. Part of the work at Rice University is supported by the Robert A. Welch Foundation through Grant No. C-1839 (P.D.).

PY - 2019/4/24

Y1 - 2019/4/24

N2 - Single crystals of Sr2Mn3As2O2 have been grown for the first time, for which we show a possible layer-selective Mott insulator behavior. This compound stands out as a hybrid structure of MnO2 and MnAs layers, analogously to the active CuO2 and FeAs layers, respectively, in the cuprate and iron-based high-temperature superconductors. Electrical transport, neutron diffraction measurements, together with density functional theory calculations on Sr2Mn3As2O2 single crystals converge toward a picture of independent magnetic order at T1∼79 K and T2∼360 K for the two Mn sublattices, with insulating behavior at odds with the metallic behavior predicted by calculations. Furthermore, our inelastic neutron-scattering studies of spin-wave dispersions for the Mn(1) sublattice reveal an effective magnetic exchange coupling of SJ∼3.7 meV. This is much smaller than those for the Mn(2) sublattice.

AB - Single crystals of Sr2Mn3As2O2 have been grown for the first time, for which we show a possible layer-selective Mott insulator behavior. This compound stands out as a hybrid structure of MnO2 and MnAs layers, analogously to the active CuO2 and FeAs layers, respectively, in the cuprate and iron-based high-temperature superconductors. Electrical transport, neutron diffraction measurements, together with density functional theory calculations on Sr2Mn3As2O2 single crystals converge toward a picture of independent magnetic order at T1∼79 K and T2∼360 K for the two Mn sublattices, with insulating behavior at odds with the metallic behavior predicted by calculations. Furthermore, our inelastic neutron-scattering studies of spin-wave dispersions for the Mn(1) sublattice reveal an effective magnetic exchange coupling of SJ∼3.7 meV. This is much smaller than those for the Mn(2) sublattice.

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