Freezing of short-range ordered antiferromagnetic clusters in the CrFeTiOsystem.

We report on the CrFeTiO(CFTO) system using a combination of x-ray diffraction, dc magnetization, ac susceptibility, specific heat and neutron diffraction measurements. CFTO is seen to crystallize in a monoclinic2symmetry. It shows a glassy freezing at∼22 K, characterized by the observation of bifurcation between ZFC and FC(T) curves, frequency dispersion acrossin ac susceptibility, and follows Vogel-Fulcher and power law type critical dynamics, very slow relaxation of iso-thermal remanent magnetization with time and a linear temperature dependence of magnetic contribution to specific heatbelow.

Anomalous dielectric response in the triple perovskite ruthenate BaBiRuO.

We have investigated the magnetic, dielectric and thermal properties of theRu= 1 magnetic dimer BaBiRuO, which is known to exhibit a spin-gap opening in conjunction with a first-order magneto-elastic phase transition at ∼175 K. Above the spin-gap temperature, the temperature dependence dielectric constant shows a peak like feature with pronounced frequency dependence. The critical slowing down behavior of this frequency dispersion suggests that a ferroelectric relaxor like electrical glassy state exists above the spin-gap opening temperature regime.

Strain-Stabilized (π, π) Order at the Surface of FeTe.

A key property of many quantum materials is that their ground state depends sensitively on small changes of an external tuning parameter, e.g., doping, magnetic field, or pressure, creating opportunities for potential technological applications.

Relieving geometrical frustration through doping in the Dy Ca BaCoO swedenborgites.

The geometrically frustrated antiferromagnet DyBaCoO is investigated through a combination of x-ray diffraction, magnetization and dielectric measurements. Systematic doping in the series Dy Ca BaCoO causes a lifting of the geometrical frustration resulting in a structural transition from a trigonal P31c to an orthorhombic Pbn2 symmetry at x  =  0.4.