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Title: Anomalous Magnetoelectric Coupling in the Paramagnetic State of a Chiral and Polar Magnet

Journal Article · · Advanced Electronic Materials
ORCiD logo [1];  [2];  [2];  [1]
  1. Department of Chemistry Princeton University Princeton 08544 USA
  2. Department of Physics and Astronomy Rutgers University Piscataway 08854 USA

Abstract Chiral magnets are excellent platforms for studying intertwined spin, charge, orbit, and lattice degrees of freedom in solid‐state materials. In this work, the anomalous magnetoelectric behavior in a chiral magnet K 2 Co 2 (SO 4 ) 3 is demonstrated using comprehensive experimental probes. This material adopts a P 2 1 3 chiral cubic structure at room temperature. Based on the results of high‐resolution synchrotron X‐ray diffraction, this study shows that the low‐temperature (<130 K) crystal structure is a P 2 1 monoclinic phase, both polar and chiral. Magnetic and thermodynamic measurements reveal highly frustrated magnetic interactions and possible non‐collinear antiferromagnetic ordering at an extremely low temperature ≈0.6 K. Critically, anomalous magnetoelectric correlations are experimentally detected in its paramagnetic temperature regime, which can arise from the synergetic interplay between magnetoelastic and piezoelectric effects. These findings thus indicate that K 2 Co 2 (SO 4 ) 3 is a unique material, displaying multiple emergent structural and magnetic phenomena. This is attributed to both its overall crystallographic symmetry and the fact that its magnetic ions are located at low‐symmetry sites.

Sponsoring Organization:
USDOE
Grant/Contract Number:
AC02-06CH11357; FG02-07ER46382
OSTI ID:
2407158
Journal Information:
Advanced Electronic Materials, Journal Name: Advanced Electronic Materials Journal Issue: 2 Vol. 11; ISSN 2199-160X
Publisher:
Wiley Blackwell (John Wiley & Sons)Copyright Statement
Country of Publication:
United States
Language:
English

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