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Domain Dynamics in Quantum-Paraelectric SrTiO_{3}.

Sergey Kustov1, Iulia Liubimova2, Ekhard K H Salje3

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Acoustic waves reveal distinct behaviors in twin dynamics below 106 K. A quantum domain glass state exhibits relaxation and hysteresis, while a quantum domain solid state shows temperature-dependent memory effects near absolute zero.

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Area of Science:

  • Condensed matter physics
  • Materials science
  • Acoustic dynamics

Background:

  • Ferroelectric materials exhibit complex domain dynamics influenced by external stimuli.
  • Understanding phase transitions and low-temperature behaviors is crucial for materials applications.

Purpose of the Study:

  • To investigate the linear and nonlinear response modes of twin dynamics in ferroelectric materials under acoustic wave forcing.
  • To characterize the distinct phases, including the quantum paraelectric, quantum domain glass, and quantum domain solid states.
  • To explore memory effects and relaxation dynamics in these low-temperature phases.

Main Methods:

  • Application of acoustic waves to induce and probe twin dynamics.
  • Temperature-dependent measurements to identify phase transitions and distinct states.
  • Analysis of elastic response, relaxation times, and temperature hysteresis.

Main Results:

  • Observed multiple linear and nonlinear response modes in twin dynamics below 106 K.
  • Identified a "quantum domain glass" state (25 K < T < 40 K) with significant relaxation and hysteresis.
  • Discovered a "quantum domain solid" state below 25 K exhibiting temperature-dependent memory effects.
  • Found that the glassiness of twin boundary dynamics diminishes as temperature approaches absolute zero.

Conclusions:

  • Twin dynamics exhibit distinct phase behaviors, including glass-like and solid-like states, under acoustic forcing at low temperatures.
  • The quantum domain solid state displays unique memory effects contingent on the lowest temperature reached.
  • Acoustic wave stimulation provides a powerful method for probing complex dynamics in ferroelectric materials.