Title

Magnetic field-temperature phase diagram of multiferroic (NH4)2FeCl5·H2O

Source Publication (e.g., journal title)

npj Quantum Materials

Authors

Amanda Clune, University of Tennessee, Knoxville
Jisoo Nam, Ulsan National Institute of Science and Technology, Korea
Minseong Lee, Ulsan National Institute of Science and Technology, Korea
Kendall D. Hughey, University of Tennessee, Knoxville
Wei Tian, Oak Ridge National Laboratory, Oak Ridge, USA
Jaime A. Fernandez-Baca, Oak Ridge National Laboratory, Oak Ridge, USA
Randy S. Fishman, Oak Ridge National Laboratory, USA
John Singleton, National High Magnetic Field Laboratory, Los Alamos National Laboratory, USA
Jun Hee Lee, Ulsan National Institute of Science and Technology, Korea
Janice L. Musfeldt, University of Tennessee, Knoxville

Document Type

Article

Publication Date

2019

DOI

https://doi.org/10.1038/s41535-019-0180-1

Abstract

Owing to their overall low energy scales, flexible molecular architectures, and ease of chemical substitution, molecule-based multiferroics are extraordinarily responsive to external stimuli and exhibit remarkably rich phase diagrams. Even so, the stability and microscopic properties of various magnetic states in close proximity to quantum critical points are highly under-explored in these materials. Inspired by these opportunities, we combined pulsed-field magnetization, first-principles calculations, and numerical simulations to reveal the magnetic field–temperature (B–T) phase diagram of multiferroic (NH4)2FeCl5⋅H2O. In this system, a network of intermolecular hydrogen and halogen bonds creates a competing set of exchange interactions that generates additional structure in the phase diagram—both in the vicinity of the spin flop and near the 30 T transition to the fully saturated state. Consequently, the phase diagrams of (NH4)2FeCl5⋅H2O and its deuterated analog are much more complex than those of other molecule-based multiferroics. The entire series of coupled electric and magnetic transitions can be accessed with a powered magnet, opening the door to exploration and control of properties in this and related materials.

Comments

This article was published openly thanks to the University of Tennessee Open Publishing Support Fund.

Licensed under a Creative Commons Attribution 4.0 International license.

Recommended Citation

Clune, A. J., Nam, J., Lee, M., Hughey, K. D., Tian, W., Fernandez-Baca, J. A., ... & Musfeldt, J. L. (2019). Magnetic field-temperature phase diagram of multiferroic (NH 4) 2 FeCl 5· H 2 O. npj Quantum Materials, 4(1), 1-8.

Submission Type

Publisher's Version