Metamagnetic transitions and magnetoelectric coupling in acentric and nonpolar Pb2Mn O4
Abstract
Acentric and nonpolar P b2Mn O4 was predicted to exhibit unique multipiezo induced magnetoelectric (ME) phenomena. In this paper, we present the results of magnetization as well as dielectric properties as a function of temperature (T), magnetic field (H), pressure (P), and electric field (E) primarily to address the ME coupling and identify the underlying mechanism behind this phenomenon. Magnetization and specific-heat measurements reveal the antiferromagnetic ordering of M n4 + spins at temperature TN=17 K . Metamagnetic transitions at three critical magnetic fields (Hc 1, Hc 2, and Hc 3) are observed for T < TN and H > 3.5 T. Further, the influences of pressure and magnetic field on Hc 1 and Hc 2 are investigated. The TN, Hc 1, and Hc 2 all decrease with increasing external pressure. The dielectric anomaly observed at TN is influenced by applying a magnetic field of H > 3.5 T. However, the electric field has minimal influence on the metamagnetic transition. The scaling between dielectric constant and magnetization meaningfully resolves the existence of magnetic-field-induced higher-order ME coupling in P b2Mn O4 at T < TN and H > 3.5 T.
- Publication:
-
Physical Review B
- Pub Date:
- May 2019
- DOI:
- 10.1103/PhysRevB.99.195129
- Bibcode:
- 2019PhRvB..99s5129K