Paramagnetic ions will influence the thermal expansion of an insulating crystal at temperatures close the Schottky specific heat peak. When the ion exhibits a dynamic Jahn-Teller effect, tunneling between different modes . distortion can occur. The sensitivity of the level splittings to the height of the tunnelling barrier then leads to an exce R tionally .large contribution. Experimental inves...

A range of packaging solutions exists for products that must be kept within a specific temperature range throughout the supply-and-distribution chain. This report summarizes the results of studies conducted over a span of 2 years by the Consortium for Distribution Packaging at Michigan State University. Thermal insulation packaging materials such as expanded polystyrene, polyurethane, corrugate...

We calculate the vibrational density-of-states in an insulating nanoparticle that is in weak mechanical contact with a semi-infinite substrate. The work is motivated by a recent experiment by Yang et al., where the low-energy phonon density-of-states of Y2O3 nanoparticles doped with Eu 3þ was measured. Preliminary results presented here, based on the conventional quasiparticle-pole approximatio...

We consider bosonic dipolar molecules in an optical lattice prepared in a mixture of different rotational states. The 1/R(3) interaction between molecules for this system is produced by exchanging a quantum of angular momentum between two molecules. We show that the Mott states of such systems have a large variety of quantum phases characterized by dipolar orderings including a state with an or...

We implement optical spectroscopy to study charged excitons in modulation-doped GaAs/AIGaAs quantum wells. We report the fLrs~ observation of the positively charged exciton and of the triplet state of the negatively charged exciton. Applyin~g a gate voltage at high magnetic fields, we investigate the transition between metallic and insulating state~ We find that while the photoluminescence fine...

We have fabricated two-dimensional (2D) small-Josephson-junction arrays of which each Al-AlOx-Al junction is shunted by a Cr resistor. The arrays with large junction resistance and large charging energy show a transition from insulating to superconducting behavior when the shunt resistance is lowered below a critical value, which is close to 2R(Q) ( R(Q) identical withh/4e(2) = 6.45 kOmega). Th...

The manganite La,Pr,Ca MnO3 is well known for its micrometer-scale phase separation into coexisting ferromagnetic metallic FMM and insulating regions. Fabrication of bridges with widths smaller than the phase-separation length scale has allowed us to probe the magnetic properties of individual phase-separated regions. At the onset of phase separation, a magnetic field induced insulator-to-metal...

Spin correlations in metallic and insulating phases of V2O3 and its derivatives are investigated using magnetic neutron scattering. Metallic samples have incommensurate spin correlations varying little with hole doping. Paramagnetic insulating samples have spin correlations only among near neighbors. The transition from either of these phases into the low temperature insulating antiferromagneti...

fire behavior of different types of eps was evaluated with the use of iso 5660 cone calorimeter test method. considering the complexity of behavior of eps against high temperatures, several specimens were tested, so a betterjudgment on fire behavior of this material could be acquired. the effects of foam density, thickness of specimens and the level of heat flux on fire behavior of foam were ex...