TY - JOUR
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 - Publisher Copyright:
© 2019 American Physical Society.
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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U2 - 10.1103/PhysRevB.99.144423
DO - 10.1103/PhysRevB.99.144423
M3 - Article
AN - SCOPUS:85065128428
SN - 2469-9950
VL - 99
JO - Physical Review B
JF - Physical Review B
IS - 14
M1 - 144423
ER -