Resonant Quantum Magnetodielectric Effect in Multiferroic Metal-Organic Framework [CH3NH3]Co(HCOO)3

TL;DR

This study demonstrates the coexistence of resonant quantum tunneling and magnetodielectric effects in a multiferroic metal-organic framework, revealing potential for quantum computing applications through magnetic and dielectric property coupling.

Contribution

It reports the first observation of RQTM and RQMD effects in [CH3NH3]Co(HCOO)3, highlighting intrinsic magnetic phase separation and field-dependent dielectric responses.

Findings

Observation of stair-shaped magnetic hysteresis indicating RQTM

Detection of negative peaks in dielectric permittivity at critical fields

Intrinsic magnetic phase separation at low temperatures

Abstract

We report the observation of both resonant quantum tunneling of magnetization (RQTM) and resonant quantum magnetodielectric (RQMD) effect in the perovskite multiferroic metal-organic framework [CH3NH3]Co(HCOO)3. An intrinsic magnetic phase separation emerges at low temperatures due to hydrogen-bond-modified long range super-exchange interaction, leading to the coexistence of canted antiferromagnetic order and single-ion magnet. Subsequently, a stair-shaped magnetic hysteresis loop along the [101] direction characterizing the RQTM appears below the magnetic blocking temperature. More interestingly, the magnetic field dependence of dielectric permittivity exhibits pronounced negative peaks at the critical fields corresponding to the RQTM, a phenomenon termed the RQMD effect which enables electrical detection of the RQTM. These intriguing properties make the multiferroic metal-organic framework a promising candidate for solid-state quantum computing.