Possible Mott transition in layered Sr_2Mn_3As_2O_2 single crystals

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

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Possible Mott transition in layered Sr_2Mn_3As_2O_2 single crystals

机译：层状Sr_2Mn_3As_2O_2单晶中可能的Mott跃迁

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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 T-1 similar to 79 K and T-2 similar to 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 similar to 3.7 meV. This is much smaller than those for the Mn(2) sublattice.

机译：Sr2Mn3As2O2的单晶是首次生长，为此我们显示了可能的层选择莫特绝缘子性能。该化合物作为MnO2和MnAs层的混合结构而突出，分别类似于铜酸盐和铁基高温超导体中的活性CuO2和FeAs层。对于两个Mn子晶格，Sr2Mn3As2O2单晶的电输运，中子衍射测量以及密度泛函理论计算朝着T-1处类似于79 K的T-2和类似于360 K处的T-2的独立磁阶收敛，具有绝缘行为与通过计算预测的金属行为不一致。此外，我们对Mn（1）子晶格的自旋波色散的非弹性中子散射研究表明，SJ的有效磁交换耦合类似于3.7 meV。这比Mn（2）子晶格小得多。

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《Physical review》 |2019年第14期|144423.1-144423.5|共5页
作者
Chen Chih-Wei; Wang Weiyi; Loganathan Vaideesh; Carr Scott V.; Harriger Leland W.; Georgen C.; Nevidomskyy Andriy H.; Dai Pengcheng; Huang C. -L.; Morosan E.;
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Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

NIST, NIST Ctr Neutron Res, Gaithersburg, MD 20899 USA;

Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

Rice Univ, Dept Phys & Astron, Houston, TX 77005 USA;

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1. Possible Mott transition in layered Sr_2Mn_3As_2O_2 single crystals [J] . Chen Chih-Wei, Wang Weiyi, Loganathan Vaideesh, Physical review . 2019,第14期

机译：在分层SR_2MN_3AS_2O_2单晶中可能的MOTT转换
2. Possible Mott transition in layered Sr2Mn3As2O2 single crystals [J] . Chen Chih-Wei, Wang Weiyi, Loganathan Vaideesh, Physical review, B . 2019,第14期

机译：分层SR2MN3AS2O2单晶中可能的卷起转变
3. Surface-Stress-Induced Mott Transition and Nature of Associated Spatial Phase Transition in Single Crystalline VO2 Nanowires [J] . Sohn JI, Joo HJ, Ahn D, Nano letters . 2009,第10期

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4. Study of the near band-edge excitonic transition energies of the mixed layered compounds of Mo_(1-x)W_x Se2 single crystals [C] . Mula Sigiro Nommensen International Conference on Technology and Engineering . 2017

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Possible Mott transition in layered Sr_2Mn_3As_2O_2 single crystals

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