Linear Thermal Expansion of SrTiO<sub>3</sub>

Tsunekawa, Shin; Watanabe, H. F. J.; Takei, H.

doi:10.1515/9783112501627-006

Cited by 2 publications

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“…This antiferrodistortive phase transition has been studied by a variety of experimental techniques. Clear anomalies in specific heat [20], thermal conductivity [21], sound velocity [22] and thermal expansion [23] have been observed at T AFD 105 K. The transition does not break inversion symmetry, but the boundaries between tetragonal domains become polar [24,25] deep inside the ordered state. In spite of being widely documented over several decades, the consequences of this phase transition for mobile electrons have been elusive.…”

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confidence: 94%

Nonmonotonic anisotropy in charge conduction induced by antiferrodistortive transition in metallicSrTiO3

Qian

Loret

et al. 2016

Phys. Rev. B

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Cubic SrTiO3 becomes tetragonal below 105 K. The antiferrodistortive (AFD) distortion leads to clockwise and counter-clockwise rotation of adjacent TiO6 octahedra. This insulator becomes a metal upon the introduction of extremely low concentration of n-type dopants. However, signatures of the structural phase transition in charge conduction have remained elusive. Employing the Montgomery technique, we succeed in resolving the anisotropy of charge conductivity induced by the AFD transition, in the presence of different types of dopants. We find that the slight lattice distortion (< 6 × 10 −4 ) gives rise to a twenty percent anisotropy in charge conductivity, in agreement with the expectations of band calculations. Application of uniaxial strain amplifies the detectable anisotropy by disfavoring one of the three possible tetragonal domains. In contrast with all other known anisotropic Fermi liquids, the anisotropy has opposite signs for elastic and inelastic scattering. Increasing the concentration of dopants leads to a drastic shift in the temperature of the AFD transition either upward or downward. The latter result puts strong constraints on any hypothetical role played by the AFD soft mode in the formation of Cooper pairs and the emergence of superconductivity in SrTiO3.

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confidence: 94%

Nonmonotonic anisotropy in charge conduction induced by antiferrodistortive transition in metallicSrTiO3

Qian

Loret

et al. 2016

Phys. Rev. B

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“…Another phase transition occurs at around 30 K, below which the Sr-ions disorder along [111] directions, rendering the structure locally triclinic [29][30][31] . Both transitions are accompanied by changes in mechanical properties [32][33][34][35][36] , as well as in the thermal expansion coefficient of STO 37 and can therefore be related to the signatures at 165 K and 30 K in Fig. 3a.…”

Section: Temperature-dependent Mechanical Propertiesmentioning

confidence: 90%

Ultrathin complex oxide nanomechanical resonators

Davidovikj¹,

Groenendijk²,

Monteiro³

et al. 2019

Preprint

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Complex oxide thin films and heterostructures exhibit a profusion of exotic phenomena, often resulting from the intricate interplay between film and substrate. Recently it has become possible to isolate epitaxially grown single-crystalline layers of these materials, enabling the study of their properties in the absence of interface effects. In this work, we create ultrathin membranes of strongly correlated materials and demonstrate top-down fabrication of nanomechanical resonators made out of SrTiO 3 and SrRuO 3 . Using laser interferometry, we successfully actuate and measure the motion of the nanodrum resonators. By measuring their temperature-dependent mechanical response, we observe signatures of structural phase transitions in SrTiO 3 , which affect the strain and mechanical dissipation in the resonators. This approach can be extended to investigate phase transitions in a wide range of materials. Our study demonstrates the feasibility of integrating ultrathin complex oxide membranes for realizing nanoelectromechanical systems on arbitrary substrates.

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Linear Thermal Expansion of SrTiO₃

Cited by 2 publications

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Nonmonotonic anisotropy in charge conduction induced by antiferrodistortive transition in metallicSrTiO3

Nonmonotonic anisotropy in charge conduction induced by antiferrodistortive transition in metallicSrTiO3

Ultrathin complex oxide nanomechanical resonators

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Linear Thermal Expansion of SrTiO3

Cited by 2 publications

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Nonmonotonic anisotropy in charge conduction induced by antiferrodistortive transition in metallicSrTiO3

Nonmonotonic anisotropy in charge conduction induced by antiferrodistortive transition in metallicSrTiO3

Ultrathin complex oxide nanomechanical resonators

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Linear Thermal Expansion of SrTiO₃