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# Search results

134 records were found.

## Ultrasound studies of clathrate thermo-electrics

Katholieke Universiteit Leuven, Faculteit Wetenschappen, Departement Natuurkunde en Sterrenkunde, Celestijnenlaan 200D, 3001 Leuven

## Thermal Spin Valves

The ability of an insulating solid to conduct heat is rarely effected by the application of a magnetic field. We have found, however, that the low temperature heat conduction of some solids increases by more than a factor of two with the application of a modest magnetic field. The effect occurs in low-dimensional magnetically ordered materials when a small gap, \delta, in the acoustic magnon (spin wave) spectra is closed using a magnetic field H > \delta/g\mu_B. Since all magnetically ordered materials must have a gap in the magnon spectra for magnons with k = 0, this may be a very general effect. Extra heat is carried through the solid only when the magentic field exceeds the critical value (H > \delta/g\mu_B). At this critical field the tiny atomic magnets in the solid abruptly change the direction they point which results in more ...

## Observation of Bulk Superconductivity in NaxCoO2.yH2O and NaxCoO2.yD2O Powder and Single Crystals

Comment: 4 pages, 4 figures and 1 table

## Non-Fermi liquid behavior near the ferromagnetic quantum critical point in the series Ca(x)Sr(1-x)RuO(3)

Comment: 16 pages, 6 figures, includes additional heat capacity data

## Variation of Specific Heat with x and y in NaxCoO2-yH2O/D2O

Comment: 4 page, 3 figures, 1 table

## Searching for the Slater Transition in the Pyrochlore Cd$_{2}$Os$_{2}$O$_{7}$ with Infrared Spectroscopy

Comment: 4 pages, 4 figures

## Renormalized behavior and proximity to a magnetic quantum critical point in BaCo$_2$As$_2$

We report synthesis and single crystal measurements of magnetic, transport and thermal properties of single crystalline BaCo$_2$As$_2$ as well as first principles calculations of the electronic structure and magnetic behavior. These results show that BaCo$_2$As$_2$ is a highly renormalized paramagnet in proximity to a quantum critical point, presumably of ferromagnetic character and that BaFeNiAs$_2$ behaves similarly. These results are discussed in relation to the properties of Ba(Fe,Co)$_2$As$_2$ and Ba(Fe,Ni)$_2$As$_2$, which are superconducting for low Co and Ni concentrations.

## Bulk Superconductivity at 14 K in Single Crystals of Fe1+yTexSe1-x

Comment: Submitted to Phys. Rev. B

## A Model of the Normal State Susceptibility and Transport Properties of Ba (Fe1-xCox)2As2: An Explanation of the Increase of Magnetic Susceptibility with Temperature

Comment: 4 figs 5 pages submitted to PRB - replaces 0906.2134

## Weak ferromagnetism and field-induced spin reorientation in K2V3O8

Comment: 5 pages, 4 ps figures, REVTEX, submitted to PRL
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