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We study experimentally and theoretically the electronic and magnetic properties of two insulating double perovskites that show similar atomic and electronic structure, but different magnetic properties. In magnetization measurements,…

Double-perovskite oxides that contain both 3d and 5d transition metal elements have attracted growing interest as they provide a model system to study the interplay of strong electron interaction and large spin-orbit coupling (SOC). Here,…

Strongly Correlated Electrons · Physics 2016-09-01 W. K. Zhu , J. -C. Tung , W. Tong , L. Ling , M. Starr , J. M. Wang , W. C. Yang , Y. Losovyj , H. D. Zhou , Y. Q. Wang , P. -H. Lee , Y. -K. Wang , Chi-Ken Lu , S. X. Zhang

We have studied the electronic and magnetic properties of double perovskites Gd2MgIrO6 by first-principles density functional theory (DFT). Based on the DFT calculations, Gd2MgIrO6 is found to have a ferromagnetic (FM) ground state. The…

Materials Science · Physics 2016-05-02 M. P. Ghimire , R. K. Thapa

Results are presented of single crystal structural, thermodynamic, and reflectivity measurements of the double-perovskite Ba2NaOsO6. These characterize the material as a 5d^1 ferromagnetic Mott insulator with an ordered moment of ~0.2 Bohr…

Strongly Correlated Electrons · Physics 2009-11-11 A. S. Erickson , S. Misra , G. J. Miller , R. R. Gupta , Z. Schlesinger , W. A. Harrison , J. M. Kim , I. R. Fisher

We report on the cubic double perovskite Ba2MgReO6 containing Re6+ ions with the 5d1 electron configuration. Resistivity, magnetization, and heat capacity measurements using single crystals show that the compound is a Mott insulator with a…

Strongly Correlated Electrons · Physics 2019-06-11 Daigorou Hirai , Zenji Hiroi

We report the structural, magnetic and thermodynamic properties of the double perovskite compound La2CuIrO6 from X-ray, neutron diffraction, neutron depolarization, dc magnetization, ac susceptibility, specific heat, muon-spin-relaxation…

The subtle interplay between spin-orbit coupling, exchange interactions, and cation ordering can lead to exotic magnetic states in transition-metal ions. We report a comprehensive study of the Re-based (5$d^1$) ordered double perovskite…

Polycrystalline insulating ferromagnetic double perovskite La2CoMnO6 possessing monoclinic structure and a high ferromagnetic Curie temperature (TC = 222 K) was rapidly synthesized ( 30 min) by irradiating stoichiometric mixture of oxides…

Materials Science · Physics 2023-07-26 M. Manikandan , A. Ghosh , R. Mahendiran

The synthesis and characterization of the previously unknown material LaCaScIrO$_6$ is reported. LaCaScIrO$_6$ presents a new example of the rare case of a double perovskite with the strongly spin-orbit coupled 5\textit{d}-ion Ir$^{4+}$ as…

Magnetic properties of an antiferromagnetic double perovskite oxide Ba2CaReO6, where Re6+ (5d1) ions with large spin-orbit coupling are arranged on the face-centered-cubic lattice, are investigated using pulsed high magnetic field up to 66…

We perform a comparative magnetic study on two series of rare-earth (RE) based double perovskite iridates RE2BIrO6 (RE=Pr,Nd,Sm-Gd;B=Zn,Mg), which show Mott insulating state with tunable charge energy gap from ~330 meV to ~560 meV by…

Strongly Correlated Electrons · Physics 2020-06-19 Yuxia Gao , Zhaoming Tian , Longmeng Xu , Malik Ashtar , Zongtang Wan , Zhengcai Xia , Feng Yang , Songliu Yuan , Yuyan Han , Wei Tong

We present a comprehensive study on the magnetic structure, dynamics, and phase evolution in the single-phase double perovskite $La_2CoMnO_6$. The mixed valence state due to oxygen deficiency is verified by X-ray photoelectron spectroscopy,…

The double perovskite ${\rm La}_2{\rm NiTiO}_6$ is identified as a three-dimensional $S=1$ quantum magnet. By means of Density Functional Theory we demonstrate that this material is a high-spin $d$-electron system deep in the Heisenberg…

Strongly Correlated Electrons · Physics 2015-03-03 Michael Karolak , Martin Edelmann , Giorgio Sangiovanni

The magnetic structure of Ca$_2$MnReO$_6$ double perovskite is investigated by neutron powder diffraction and bulk magnetization, showing dominant non-collinear Mn magnetic moments [$4.35(7)$ $\mu_B$] that are orthogonally aligned with the…

Strongly Correlated Electrons · Physics 2018-03-01 A. S. Cavichini , M. T. Orlando , J. B. Depianti , J. L. Passamai , F. Damay , F. Porcher , E. Granado

In the present investigation, some novel magnetic behaviors exhibited by double perovskite (DP) Eu2CoMnO6(ECMO) has been reported. XRD analysis of ECMO showed that it has a monoclinic crystal structure (space group P 21/n). A second-order…

Materials Science · Physics 2019-09-30 Mohd Alam , Arkadeb Pal , Khyati Anand , Prajyoti Singh , Sandip Chatterjee

Here, we report on the structural, electronic, and magnetic properties of a polycrystalline sample of the LaCaCoIrO$_6$ double-perovskite investigated by means of synchrotron x-ray powder diffraction, x-ray absorption spectroscopy, and…

Strongly Correlated Electrons · Physics 2023-10-03 L. Bufaiçal , L. S. I. Veiga , J. R. L. Mardegan , T. Pohlmann , S. Francoual , S. S. Dhesi , M. B. Fontes , E. M. Bittar

We investigate the structural, magnetic and spin-state transitions, and magnetocaloric properties of Sr$_{2-x}$La$_x$CoNbO$_6$ ($x=$ 0--1) double perovskites. The structural transition from tetragonal to monoclinic phase at $x$ $\geqslant$…

Materials Science · Physics 2020-04-21 Ajay Kumar , R. S. Dhaka

Magnetic refrigeration at room-temperature is a technology that could potentially be more environmentally-friendly, efficient and affordable than traditional refrigeration. The search for suitable materials for magnetocaloric refrigeration…

Strongly Correlated Electrons · Physics 2019-03-13 C. Gauvin-Ndiaye , A. -M. S. Tremblay , R. Nourafkan

We investigate the electronic and magnetic properties of the newly synthesized double perovskites Y$_{2}$NiIrO$_{6}$ and La$_{2}$NiIrO$_{6}$, using density functional calculations, crystal field theory, superexchange pictures, and Monte…

Materials Science · Physics 2023-11-20 Lu Liu , Ke Yang , Di Lu , Yaozhenghang Ma , Yuxuan Zhou , Hua Wu

The La$_2$CoIr$_{1-x}$Ti$_x$O$_6$ double perovskite series serves as an effective platform for investigating the evolution of magnetic and electronic properties as a function of chemical pressure (doping) or hydrostatic pressure due to the…

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