Magnetic and transport properties of the mixed 3-5-4double perovskite SmCoIrO.

Iridium-based double perovskites having mixed 3-5-4magnetic sub-lattices are expected to exhibit exotic magnetic phenomenon. In this paper, we report a study of structural, magnetic and transport properties of the mixed 3-5-4double perovskite SmCoIrO(SMCO), which crystallizes in monoclinic structure with space group2/and the crystal symmetry remains same throughout the measured temperature down to 15 K. High resolution synchrotron x-ray diffraction reveals an isostructural phase transition around 104 K.

Observations of ferromagnetic cluster glass and exchange bias behavior in the double perovskite compound LaCuCrIrO.

LaCuIrO is a spin-orbit coupled Mott insulator, and shows a transition to noncollinear antiferromagnetic state from paramagnetic state below 74 K, and further into a weak ferromagnetic state below 54 K. Despite having two different magnetic phases, the LaCuIrO compound does not exhibit exchange bias phenomenon. In this present work, we report an experimental investigation on the structural and magnetic properties of the double perovskite compound LaCuCrIrO through high-resolution synchrotron x-ray diffraction, x-ray absorption near edge structure (XANES), and temperature and field-dependent magnetization measurements.

Optical and magnetic properties of Gd Sr CrO (0 ⩽ x ⩽ 0.15).

Optical and magnetic properties of Gd Sr CrO (0  ⩽  x  ⩽  0.15) polycrystalline samples have been investigated to identify the role of Sr ion in GdCrO compound. Quantitative structural analysis using Rietveld refinement suggests the formation of single orthorhombic phase up to x  =  0.

Spectroscopic and magnetic investigations of a spin-frustrated Mn-doped CoAlO spinel.

Single-phase polycrystalline spin-frustrated spinel oxides Co1-xMnxAl2O4 (0 ≤ x ≤ 0.3) have been prepared to investigate the optical and magnetic properties. Linear variation of the lattice parameter along with the characteristic hyperfine electron paramagnetic resonance (EPR) signal establish the fact that the Mn2+ ions are incorporated at Co2+ sites of the CoAl2O4 lattice.

Exchange bias effect in a finite site disordered canted antiferromagnet.

We report the temperature and magnetic field dependent magnetic properties of the single-phase polycrystalline LaSrCrRuO sample to explore the intrinsic magnetic phases of the sample. Our combined temperature and field dependent magnetization studies reveal the formation of ferromagnetic (FM) cluster-glass in the antiferromagnetic (AFM) matrix of host LaCrO. Interestingly, the as-studied sample exhibits both zero-field-cooled (horizontal shift) and field-cooled (vertical shift) exchange bias effects and, in both cases, magnitude of exchange bias field continuously increases with the decrease of temperature.

Evolution of magnetic properties and exchange interactions in Ru doped YbCrO3.

Magnetic properties of YbCr1-x Ru x O3 as a function of temperature and magnetic field have been investigated to explore the intriguing magnetic phenomena in rare-earth orthochromites. A quantitative analysis of x-ray photoelectron spectroscopy confirms the mixed valence state (Yb(3+) and Yb(2+)) of Yb ions for the highest doped sample. Field-cooled magnetization reveals a broad peak around 75 K and then becomes zero at about 20-24 K, due to the antiparallel coupling between Cr(3+) and Yb(3+) moments.

Correlation among disorder, electronic and magnetic phases of SrRuO3.

Electric and magnetic properties of Sr1-xBaxRu1-xTixO3 (0 ⩽ x ⩽ 0.8) have been investigated to find the interrelationship between metallicity and ferromagnetism in SrRuO3 (SRO). The simultaneous doping of Sr and Ru with Ba and Ti results in single phase SRO at x = 0.