Magnetoelectric effect induced by the delocalized 93mNb state

TL;DR

This paper investigates the temperature- and density-dependent decay of 93mNb nuclear excitation, revealing a nonlinear magnetoelectric response linked to delocalized nuclear states in niobium, with potential implications for understanding nuclear-electronic interactions.

Contribution

It presents the first observation of a nonlinear magnetoelectric effect induced by delocalized nuclear excitations in a solid-state system.

Findings

Decay of 93mNb nuclear excitation depends on temperature and density.

Nonlinear magnetoelectric response appears in high-purity niobium with nuclear delocalization.

Resonant peaks shift with temperature and magnetic field.

Abstract

We report a temperature- and density-dependent decay of the 93mNb nuclear excitation and give a minimal interpretation on the underlying physics. This anomaly indicated nuclear resonant absorption as well as delocalization of the long-lived Moessbauer state in the crystal. A nonlinear magnetoelectric response, on low-frequency drive current, showed up in the bulk metal of a high-purity niobium crystal and then disappeared with vanishing benchmarks of delocalized nuclear excitation. Several nonlinear resonant peaks, on the order of several hundreds of Hz, grew up with the applied magnetic field. The central frequencies of these peaks decreased with temperature.