Anisotropic resistivity and superconducting instability in ferroelectric metals

Vladimir A. Zyuzin, Alexander A. Zyuzin

Research output: Contribution to journalArticleScientificpeer-review

4 Citations (Scopus)
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We propose a theoretical model of a ferroelectric metal where spontaneous electric polarization coexists with the conducting electrons. In our model we adopt a scenario when conducting electrons interact with two soft transverse optical phonons, generalize it to the case when there is a spontaneous ferroelectric polarization in the system, and show that a linear coupling to the phonons emerges as a result. We find that this coupling results in anisotropic electric transport which has a transverse to the current voltage drop. Importantly, the obtained transverse component of the resistivity has distinct linear dependence with temperature. Moreover, we show that the coupling enhances superconducting transition temperature of the ferroelectric metal. We argue that our results help to explain recent experiments on ferroelectric strontium titanate as well as provide new experimental signatures to look for.

Original languageEnglish
Article numberL121114
Pages (from-to)1-6
Number of pages6
JournalPhysical Review B
Issue number12
Publication statusPublished - 15 Sept 2022
MoE publication typeA1 Journal article-refereed


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