A. Wahl

Anomaly in the dielectric response at the charge-orbital-ordering transition of Pr 0.67 Ca 0.33 MnO 3

The complex impedance of a

Magnetocaloric effect and improved relative cooling power in (La0.7Sr0.3MnO3/SrRuO3) superlattices

{mathrm{Pr}}_{0.67}{mathrm{Ca}}_{0.33}{mathrm{MnO}}_{3}

Coexistence of inverse and normal magnetocaloric effect in A-site ordered NdBaMn2O6

crystal has been measured. The frequency dependence is studied for a wide range of temperatures (50char21{}403 K) and is found to be characteristic of relaxation process with a single Debye time relaxation constant, which is interpreted as a dielectric constant of the material. A strong peak is observed in this dielectric constant (up to

On the derivation of the magnetocaloric properties in ferrimagnetic spinel Mn3O4

{10}^{6})

Vortex dynamics and phase diagram of BSCCO in the presence of columnar defects

at the charge ordering transition suggesting an interpretation in terms of ordering electric dipoles at

Bose-glass behaviour in Bi2Sr2Ca1−xYxCu2O8 crystals with columnar defects: experimental evidence for variable-range hopping

{T}_{mathrm{CO}}

Dimensional crossover vortex fluctuations in irreversibility line of high-quality Tl2Ba2CaCu2O8 thin film

or in term of phase separation. Comparison with

Angular slippage from the crystallographiccaxis of the reversible magnetization vector in a tilted crystal of a highly anisotropic cuprate superconductor

{mathrm{Pr}}_{0.63}{mathrm{Ca}}_{0.37}{mathrm{MnO}}_{3}

Superconducting transition in Tl-2 2 1 2 thin films and polycrystals: Effect of the dimensionality of the sample

char22{}in which the phase separation is much smaller and the peak in the dielectric constant is absentchar22{}suggests an interpretation in term of phase separation between insulating and metallic states.

On the role of anisotropy in superconducting cuprates: A complete study of Bi, Hg, Tl — Single crystals

Magnetic properties of a series of (La(0.7)Sr(0.3)MnO(3)/SrRuO(3)) superlattices, where the SrRuO(3) layer thickness is varying, are examined. A room-temperature magnetocaloric effect is obtained owing to the finite size effect which reduces the T(C) of La(0.7)Sr(0.3)MnO(3) layers. While the working temperature ranges are enlarged, - ΔS(M)(max) values remain similar to the values in polycrystalline La(0.7)Sr(0.3)MnO(3). Consequently, the relative cooling powers are significantly improved, the microscopic mechanism of which is related to the effect of the interfaces at La(0.7)Sr(0.3)MnO(3)/SrRuO(3) and higher nanostructural disorder. This study indicates that artificial oxide superlattices/multilayers might provide an alternative pathway in searching for efficient room-temperature magnetic refrigerator for (nano) micro-scale systems.