AC susceptibility and $^{51}$V NMR study of MnV$_2$O$_4$

TL;DR

This study combines NMR and magnetization measurements to explore the complex magnetic behavior of MnV₂O₄, revealing coexistence of ferrimagnetic order and spin-glass-like phenomena driven by competing spin and orbital interactions.

Contribution

It provides new insights into the magnetic ground state of MnV₂O₄ by linking NMR spectra with susceptibility data, highlighting the coexistence of long-range and short-range magnetic orders.

Findings

Identification of multiple NMR lines indicating complex magnetic states

Observation of reentrant spin-glass-like behavior below ferrimagnetic transition

Evidence of competition between spin and orbital ordering affecting magnetic properties

Abstract

We report $^{51}$V zero-field NMR of manganese vanadate spinel of MnV$_2$O$_4$, together with both ac and dc magnetization measurements. The field and temperature dependence of ac susceptibilities show a reentrant-spin-glass-like behavior below the ferrimagnetic(FEM) ordering temperature. The zero-field NMR spectrum consists of multiple lines ranging from 240 MHz to 320 MHz. Its temperature dependence reveals that the ground state is given by the simultaneous formation of a long-range FEM order and a short-range order component. We attribute the spin-glass-like anomalies to freezing and fluctuations of the short-range ordered state caused by the competition between spin and orbital ordering of the V site.