Observation of Enhanced Long-Range Ferromagnetic Order in B-Site Ordered Double Perovskite Oxide CdCrSbO.

A B-site ordered double perovskite oxide CdCrSbO was synthesized under high-pressure and high-temperature conditions. The compound crystallizes to a monoclinic structure with a space group of 2/. The charge configuration is confirmed to be that of Cd/Cr/Sb.

High-Pressure Synthesis of Semiconducting PbCuMnO with Near-Room-Temperature Ferrimagnetic Order.

A transition-metal oxide of PbCuMnO was prepared at 1523 K and 10 GPa. An A-site-ordered quadruple perovskite structure with the space group 3̅ is assigned for this compound. Based on bond-valence-sum calculations and X-ray absorption spectroscopy, the charge combination is determined to be PbCuMnO.

Exceptional Magnetocaloric Responses in a Gadolinium Silicate with Strongly Correlated Spin Disorder for Sub-Kelvin Magnetic Cooling.

The development of magnetocaloric materials with a significantly enhanced volumetric cooling capability is highly desirable for the application of adiabatic demagnetization refrigerators in confined spatial environments. Here, the thermodynamic characteristics of a magnetically frustrated spin-7/2 Gd[SiO]O is presented, which exhibits strongly correlated spin disorder below ≈1.5 K.

High-Pressure Synthesis of Quadruple Perovskite Oxide CaCuCrReO with a High Ferrimagnetic Curie Temperature.

An AA'BB'O-type quadruple perovskite oxide of CaCuCrReO was synthesized at 18 GPa and 1373 K. Both an A- and B-site ordered quadruple perovskite crystal structure was observed, with the space group -3. The valence states are verified to be CaCuCrReO by bond valence sum calculations and synchrotron X-ray absorption spectroscopy.

Robust Crystal Phase Separation with Distinct Charge, Orbital, and Spin Orders in AgMnO.

An AA'BO-type A-site-ordered quadruple perovskite oxide AgMnO was prepared by high-pressure and high-temperature methods. At room temperature, the compound crystallizes into a cubic 3̅ symmetry with a charge distribution of AgMnMnO. With the temperature decreasing to ≈ 180 K, the compound undergoes a structural phase transition toward a monoclinic 2/ symmetry, giving rise to a B-site charge- and orbital-ordered AgMnMnMnO phase.

CaCuMnTeO: An Intrinsic Ferrimagnetic Insulator Prepared Under High Pressure.

CaCuMnTeO was synthesized using high-temperature and high-pressure conditions. The compound possesses an A- and B site ordered quadruple perovskite structure in 3̅ symmetry with the charge combination of CaCuMnTeO. A ferrimagnetic phase transition originating from the antiferromagnetic interaction between A' site Cu and B site Mn ions is found to occur at ≈ 100 K.

Antiferroelectricity-Induced Negative Thermal Expansion in Double Perovskite Pb CoMoO.

Materials with negative thermal expansion (NTE) attract significant research attention owing to their unique physical properties and promising applications. Although ferroelectric phase transitions leading to NTE are widely investigated, information on antiferroelectricity-induced NTE remains limited. In this study, single-crystal and polycrystalline Pb CoMoO samples are prepared at high pressure and temperature conditions.

High-pressure single crystal growth and magnetoelectric properties of CdMnO.

The concurrent presence of large electric polarization and strong magnetoelectric coupling is quite desirable for potential applications of multiferroics. In this paper, we report the growth of CdMnOsingle crystals by flux method under a high pressure of 8 GPa for the first time. An antiferromagnetic (AFM) order with a polar magnetic point group is found to occur at the onset temperature of= 88 K (AFM1 phase).

Strong Magnetocaloric Coupling in Oxyorthosilicate with Dense Gd Spins.

Searching for working refrigerant materials is the key element in the design of magnetic cooling devices. Herein, we report on the thermodynamic and magnetocaloric parameters of an phase oxyorthosilicate, GdSiO, by field-dependent static magnetization and specific heat measurements. An overall correlation strength of || ≈ 3.

Room-Temperature Magnetism in 2D MnGa -H Induced by Hydrogen Insertion.

2D room-temperature magnetic materials are of great importance in future spintronic devices while only very few are reported. Herein, a plasma-enhanced chemical vapor deposition approach is exploited to construct the 2D room-temperature magnetic MnGa -H single crystal with a thickness down to 2.2 nm.

Realization of a Half Metal with a Record-High Curie Temperature in Perovskite Oxides.

Half metals, in which one spin channel is conducting while the other is insulating with an energy gap, are theoretically considered to comprise 100% spin-polarized conducting electrons, and thus have promising applications in high-efficiency magnetic sensors, computer memory, magnetic recording, and so on. However, for practical applications, a high Curie temperature combined with a wide spin energy gap and large magnetization is required. Realizing such a high-performance combination is a key challenge.