Colossal magnetocapacitance and scale-invariant dielectric response in phase-separated manganites

Details Colossal magnetocapacitance and scale-invariant dielectric response in phase-separated manganites Colossal magnetocapacitance and scale-invariant dielectric response in phase-separated manganites

2007-03-02

arxiv.org/abs/cond-mat/0703046v1

Physics

Condensed Matter

Strongly Correlated Electrons

32 pages, 4 figures, Supplementary section included, Submitted to Nature Physics

Scientific paper

Thin films of strongly-correlated electron materials (SCEM) are often grown epitaxially on planar substrates and typically have anisotropic properties that are usually not captured by edge-mounted four-terminal electrical measurements, which are primarily sensitive to in-plane conduction paths. Accordingly, the correlated interactions in the out-of-plane (perpendicular) direction cannot be measured but only inferred. We address this shortcoming and show here an experimental technique in which the SCEM under study, in our case a 600 Angstrom-thick (La1-yPry)0.67Ca0.33MnO3 (LPCMO) film, serves as the base electrode in a metal-insulator-metal (MIM) trilayer capacitor structure. This unconventional arrangement allows for simultaneous determination of colossal magnetoresistance (CMR) associated with dc transport parallel to the film substrate and colossal magnetocapacitance (CMC) associated with ac transport in the perpendicular direction. We distinguish two distinct strain-related direction-dependent insulator-metal (IM) transitions and use Cole-Cole plots to establish a heretofore unobserved collapse of the dielectric response onto a universal scale-invariant power-law dependence over a large range of frequency, temperature and magnetic field.

Affiliated with

Also associated with

No associations

Rating

Colossal magnetocapacitance and scale-invariant dielectric response in phase-separated manganites does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Colossal magnetocapacitance and scale-invariant dielectric response in phase-separated manganites, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Colossal magnetocapacitance and scale-invariant dielectric response in phase-separated manganites will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-284295