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11 records were found.

## Depletion of the density of states at the Fermi level in metallic colossal magnetoresistive manganites

We have performed tunneling spectroscopy measurements down to 4.2 K on single crystals of La0.75Sr0.25MnO3 and La0.7Ca0.3MnO3, which show the colossal magnetoresistive behavior in the ferromagnetic metallic phase. The tunneling spectroscopy measurements give information on the density of states (DOS) at and close to the Fermi level EF. The observed energy dependence of the DOS is similar to that seen in correlated oxides with disorder, which is an important observation since it raises fundamental questions regarding the nature of the metallic state in these oxides. Measurements at low temperatures reveal that the DOS in these compounds show a depletion close to EF, |E–EF|< 15 meV; unlike that in conventional metals. The normalized DOS, close to EF shows an energy dependence alpha |E–EF|2 at low temperatures but remains finite as E - EF...

## Colossal electroresistance and current induced switching in ferromagnetic insulating state of La0.82Ca0.18MnO3

Colossal electroresistance and current induced resistivity switching have been measured in the ferromagnetic insulating (FMI) state of single crystal manganite La0.82Ca0.18MnO3. The sample has a Curie transition temperature TC = 165 K and the FMI state is realized for temperatures T<100 K. The electroresistance (ER), arising from a strong nonlinear resistivity, attains a large value ( ≈ 100%) in the FMI state. However, this is accompanied by a collapse of the magnetoresistance (MR) to a small value even in magnetic field (H) of 10 T. This demonstrates that the mechanisms that give rise to ER and MR are effectively decoupled.

## Confined spin waves reveal an assembly of nanosize domains in ferromagnetic La(1-x)CaxMnO3 (x=0.17,0.2)

Comment: 4 pages, 5 figures

## Quantized spin waves in the metallic state of magnetoresistive manganites

Comment: 4 pages, 5 figures

## Charge Ordering and Polaron Formation in the Magnetoresistive Oxide La0.7Ca0.3MnO3

Comment: 4 pages, 4 eps figures, to be published in Phys. Rev. Lett

## Intrinsic inhomogeneities and effects of resistive switching in doped manganites

The effect of resistive switching in doped manganites being in the ferromagnetic state has been studied using resistive and magneto-optic methods. The visualization of magnetic structure of La0.75Sr0.25MnO3-x single crystals, and its transformation under electric current proposed local superheating of the material above the Curie temperature, which was supported by numerical calculation. The obtained results suggest a significant role of micrometer-scale inhomogeneity of manganites in phase separation, magnetic and transport properties of the material.

## Intrinsic Nanoscale Inhomogeneities in Transition Metal Oxides

Comment: 11 pages, 7 figures, submitted to Phys. Rev. B

## Spin dynamics of strongly-doped La_{1-x}Sr_xMnO_3

Comment: 4 pages (RevTex), 3 figures (encapsulated postscript)