Abstract
Entanglement of two different quantum orders is of an interest of the modern condensed matter physics. One of the examples is the dynamical multiferroicity, where fluctuations of electric dipoles lead to magnetization. We investigate this effect at finite temperature and demonstrate an elevated magnetic response of a ferroelectric near the ferroelectric quantum critical point (FE QCP). We calculate the magnetic susceptibility of a bulk sample on the paraelectric side of the FE QCP at finite temperature and find enhanced magnetic susceptibility near the FE QCP. We propose quantum paraelectric strontium titanate as a candidate material to search for dynamic multiferroicity. We estimate the magnitude of the magnetic susceptibility for this material and find that it is detectable experimentally.
Highlights
Entanglement of two different quantum orders is of an interest of the modern condensed matter physics
In this work we consider a bulk material in the vicinity of a ferroelectric phase transition, and investigate the enhanced magnetic susceptibility at finite temperatures upon approaching the quantum critical point (QCP)
A strong increase of the magnetic susceptibility may occur while approaching the QCP: the underlying reason for this enhancement is an increase of the density of states of phonons due to the softening of the ferroelectric mode near the QCP, which is consistent with z > 1
Summary
Entanglement of two different quantum orders is of an interest of the modern condensed matter physics. In this work we consider a bulk material in the vicinity of a ferroelectric phase transition, and investigate the enhanced magnetic susceptibility at finite temperatures upon approaching the quantum critical point (QCP).
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