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29 March 2024
 
  » arxiv » 1908.1631

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Evidence of the impurity spin coupling with quantum paraelectric fluctuations in CaTi1-xRuxO3
Ivica M. Bradarić ; Feodor V. Kusmartsev ;
Date 5 Aug 2019
AbstractQuantum paraelectrics are materials in which a long-range ferroelectric/antiferroelectric order is suppressed by quantum fluctuations, i.e. zero-point motion of the lattice prevents condensation of the soft polar phonon mode even at T = 0 K. The most prominent quantum paraelectric materials are SrTiO3, KTaO3, and CaTiO3. Here we focus on peculiar properties of the pseudo-cubic perovskite CaTi1-xRuxO3 system. Namely, as soon as any concentration of either Ru or Ti is introduced into the pure compounds, a concentration-independent ferromagnetic-like transition occurs at low temperatures. We present the experimental evidence of the spin-polarized ground state of CaTi1-xRuxO3 induced by coupling of magnetic moments of Ru impurities with quantum paraelectric fluctuations in the host compound CaTiO3.
Source arXiv, 1908.1631
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