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Large coupled magnetoresponses in EuNbO2N.

A Belén Jorge¹, Judith Oró-Solé, Ana M Bea

¹Institut de Ciència de Materials de Barcelona (C.S.I.C.), Campus U.A.B., 08193 Bellaterra, Spain.

Journal of the American Chemical Society

|September 2, 2008

Summary

This summary is machine-generated.

Researchers synthesized novel perovskites, EuMO2N, to find materials responding strongly to magnetic fields. EuNbO2N exhibits colossal magnetoresistance and giant magnetocapacitance, though the latter is microstructurally driven.

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Area of Science:

Materials Science
Condensed Matter Physics
Solid-State Chemistry

Background:

Discovering materials with significant responses to magnetic fields is crucial for advanced electronic applications.
Perovskite structures offer a versatile platform for tuning electronic and magnetic properties.
The interplay between magnetic order and structural distortions can lead to unique magnetoelectric phenomena.

Purpose of the Study:

To explore a new strategy for discovering materials with large resistive or capacitive responses to magnetic fields.
To synthesize and characterize novel europium-molybdenum-oxynitrides (EuMO2N) perovskites.
To investigate the magnetic and magnetoelectric properties of these new materials.

Main Methods:

Synthesis of EuMO2N (M = Nb, Ta) perovskites.
Characterization of ferromagnetic order of Eu2+ spins.
Investigation of potential off-center distortions of M5+ cations.
Measurement of electrical resistance and capacitance under varying magnetic fields at low temperatures.

Main Results:

EuNbO2N perovskites were successfully synthesized, exhibiting ferromagnetic order.
EuNbO2N displayed colossal magnetoresistances at low temperatures.
A giant magnetocapacitance effect was observed in EuNbO2N.
The magnetocapacitance was attributed to a microstructural effect, not intrinsic multiferroism.

Conclusions:

EuMO2N perovskites represent a promising class of materials for exploring magnetic field responses.
EuNbO2N demonstrates significant colossal magnetoresistance, highlighting its potential for magnetic sensing.
The observed giant magnetocapacitance in EuNbO2N is linked to microstructure, necessitating further research for intrinsic effects.