Carlos Cosio-Castaneda

Structure and magnetic properties of the weak ferromagnet Sr2-xLaxIrO4

The 5d electron-based Sr2?xLaxIrO4 system (0?x?0.2) has been synthesized by a solid-state route. The x = 0 composition is a nonmetallic weak ferromagnet with a Curie temperature at about 240?K. The crystal structure behaviour and magnetic properties exhibited by this Sr2?xLaxIrO4 system can be explained on the basis of the extended character of the 5d electrons of the Ir cation and its valence states. Rietveld analysis of x-ray powder diffraction on Sr2IrO4 agrees well with previous structural neutron experiments. Furthermore, density functional theory (DFT) calculations predict that I41/acd represents a more stable crystal structure than K2NiF4 (I4/mmm). Electrical resistivity and magnetic properties of Sr2?xLaxIrO4 are strongly dependent on the Ir3+ content. The Sr2?xLaxIrO4 magnetic behaviour in the range of 2?240?K can be ascribed to a weak ferromagnet, produced by an array of canted antiferromagnetically ordered Ir4+ magnetic moments.

Magnetic behavior of the Bi2−ySryIr2O7 pyrochlore solid solution

The temperature dependence of magnetic susceptibility of the Bi

Synthesis and structural analysis of Bi2−ySryIr2O7, a new pyrochlore solid solution

_{2-y}

On the electrical properties of the Bi2−ySryIr2O7 pyrochlore solid solution: Quantum ab initio and classic calculations

Sr

Magnetic behavior of the Bi{sub 2−y}Sr{sub y}Ir{sub 2}O{sub 7} pyrochlore solid solution

_{y}

Magnetic ordering in Sr2IrO4 from first principles

Ir

Crystal structure and electrical properties of the Bi2-ySryIr2O7 alpha-pyrochlore solid solution

_{2}

Synthesis and structural analysis of Bi{sub 2-y}Sr{sub y}IrO, a new pyrochlore solid solution

O

Magnetic ordering in Sr

_{7}

_{2}

system was studied from 2 to 300 K. According to these measurements, the solid solution