Magnetic and electric properties in the distorted tetrahedral spin chain system Cu₃Mo₂O₉

Abstract

We study the multiferroic properties in the distorted tetrahedral quasi-one dimensional spin system Cu3Mo2O9, in which the effects of the low dimensionality and the magnetic frustration are expected to appear simultaneously.We clarify that the antiferromagnetic order is formed together with ferroelectric properties at TN = 7.9 K under zero magnetic field and obtain the magnetic-field-temperature phase diagram by measuring dielectric constant and spontaneous electric polarization. It is found that the antiferromagnetic phase possesses a spontaneous electric polarization parallel to the c axis when the magnetic field H is applied parallel to the a axis. On the other hand, there are three different ferroelectric phases in the antiferromagnetic phase for H parallel to the c axis.

Magnetic and Dielectric Properties in Multiferroic Cu3Mo2O9under High Magnetic Fields

“…3(a) that the phase boundaries just below 20 T obtained from the magnetic-field dependences of the magnetization and the electric polarization in this work and ref. [9] connect to the ones around 8 K obtained from the temperature dependence of the specific heat [14] and the dielectric constant [7,16]. And consequently, we settle the regions of multiferroic phases.…”

“…At 0 T, P c has a finite value. This reflects the spontaneous electric polarization along the c axis [16]. The P c increases with increasing magnetic field, saturates around 15 T, and shows a rapid drop around 20 T. The magnetic-field hysteresis effects appear in both of P c and M a , as shown in Figs.…”

“…We show the H c -T and H a -T phase diagrams with the phase boundaries obtained from the present experiments, of which detailed results are not shown here, and our previous ones in refs. [7,16] in Figs. 3(a) and 3(b), respectively.…”

Frustrated Antiferromagnetic Spin Chains of Edge-Sharing Tetrahedra in Volcanic Minerals K3Cu3(Fe0.82Al0.18)O2(SO4)4 and K4Cu4O2(SO4)4MeCl

“…Among these three tetrahedral quasi-one dimensional spin systems, the only widely spread one contains corner-sharing tetrahedra chains, for instance, in Cu3Mo2O9 [53,54] and in pyrochlore lattices 30 . We did not manage to find in the literature any data on experimental studies of magnetic compounds, in which spin tetrahedra would be linked into chains via edges.…”

Raman Scattering in (Cu,Zn)3(Mo,W)2O9

“…Very recently, the multiferroic properties have been reported in Cu 3 Mo 2 O 9 [4,5]. It possesses two distorted tetrahedral quantum spin chains, which are made from S = 1/2 Cu 2+ spins at three different Cu sites, namely Cu1-Cu3, in the orthorhombic unit cell [6], as shown in Fig.…”