Internal Friction Associated With Domain Walls and Ferroelastic Phase Transition in LNPP

Sun, Wenyuan; Shen, Huimin; Wang, Yening; Baosheng, Lu

doi:10.1051/jphyscol:198510133

Cited by 10 publications

(7 citation statements)

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“…This observation can be interpreted as follow: the FEDW density increases when the temperature draws near the structural transition. In fact, this result is in complete agreement with the findings of Wenyuan et al, who proved that the number of domains becomes larger as the temperature approaches the fer roelastic-paraelastic transition temperature [32]. Fig.…”

Section: Resultssupporting

confidence: 93%

On the magnetostructural transition in MnCoGeB alloy ribbons

Quintana-Nedelcos

Llamazares

Flores‐Zúñiga

2015

Journal of Alloys and Compounds

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Section: Resultssupporting

confidence: 93%

On the magnetostructural transition in MnCoGeB alloy ribbons

Quintana-Nedelcos

Llamazares

Flores‐Zúñiga

2015

Journal of Alloys and Compounds

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“…If the twin walls in EuTiO 3 are subject to pinning by oxygen vacancies, as in LaAlO 3 , it is likely that their freezing interval will also be in the vicinity of ∼450 K, i.e., well above T c . In this case the observed variations in Q −1 most likely reflect changes in the number density, N, and thickness, w, of ferroelastic twin walls, which are expected to increase according to w Ý N Ý (T c − T ) −1 as T → T c [50][51][52][53]. Interaction of the twin walls with the underlying lattice and point defects is known to be stronger for thin walls than thick walls [54,55].…”

Section: Discussionmentioning

confidence: 99%

Elastic and anelastic relaxations associated with phase transitions inEuTiO3

et al. 2014

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Elastic and anelastic properties of single crystal samples of EuTiO 3 have been measured between 10 and 300 K by resonant ultrasound spectroscopy at frequencies in the vicinity of 1 MHz. Softening of the shear elastic constants C 44 and 1 2 (C 11 − C 12 ) by ∼20-30% occurs with falling temperature in a narrow interval through the transition point, T c = 284 K, for the cubic-tetragonal transition. This is accounted for by classical coupling of macroscopic spontaneous strains with the tilt order parameter in the same manner as occurs in SrTiO 3 . A peak in the acoustic loss occurs a few degrees below T c and is interpreted in terms of initially mobile ferroelastic twin walls, which rapidly become pinned with further lowering of temperature. This contrasts with the properties of twin walls in SrTiO 3 , which remain mobile down to at least 15 K. No further anomalies were observed that might be indicative of strain coupling to any additional phase transitions above 10 K. A slight anomaly in the shear elastic constants, independent of frequency and without any associated acoustic loss, was found at ∼140 K. It marks a change from elastic stiffening to softening with falling temperature and perhaps provides evidence for coupling between strain and local fluctuations of dipoles related to the incipient ferroelectric transition. An increase in acoustic loss below ∼80 K is attributed to the development of dynamical magnetic clustering ahead of the known antiferromagnetic ordering transition at ∼5.5 K. Detection of these elastic anomalies serves to emphasize that coupling of strain with tilting, ferroelectric, and magnetic order parameters is likely to be a permeating influence in determining the structure, stability, properties, and behavior of EuTiO 3 .

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“…Local distortions on a nm scale seen at room temperature by high resolution transmission electron microscopy have been proposed as being embryonic to tweed [88]. In general, the width, w, and number density, N, of ferroelastic twin walls are expected to increase as w ∝ N ∝ (T c − T) −1 at a second order transition as the transition temperature, T c (or T * c for the pseudoproper case), is approached from below [38,[99][100][101]. Their influence on bulk elastic properties will be greatest in a temperature interval immediately below the transition point, where the effective volume they fill is highest and where they remain mobile.…”

Section: A Stabilised Ferroelastic Microstructure?mentioning

confidence: 99%

Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe_0.957Co_0.043)₂As₂

Carpenter

Evans

Schiemer

et al. 2019

J. Phys.: Condens. Matter

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The hypothesis that strain has a permeating influence on ferroelastic, magnetic and superconducting transitions in 122 iron pnictides has been tested by investigating variations of the elastic and anelastic properties of a single crystal of Ba(Fe 0.957 Co 0.043 ) 2 As 2 by resonant ultrasound spectroscopy as a function of temperature and externally applied magnetic field. Non-linear softening and stiffening of C 66 in the stability fields of both the tetragonal and orthorhombic structures has been found to conform quantitatively to the Landau expansion for a pseudoproper ferroelastic transition which is second order in character. The only exception is that the transition occurs at a temperature (T S ≈ 69 K) ~10 K above the temperature at which C 66 would extrapolate to zero (T * cE ≈ 59 K). An absence of anomalies associated with antiferromagnetic ordering below T N ≈ 60 K implies that coupling of the magnetic order parameter with shear strain is weak. It is concluded that linear-quadratic coupling between the structural/electronic and antiferromagnetic order parameters is suppressed due to the effects of local heterogeneous strain fields arising from the substitution of Fe by Co. An acoustic loss peak at ~50-55 K is attributed to the influence of mobile ferroelastic twin walls that become pinned by a thermally activated process involving polaronic defects. Softening of C 66 by up to ~6% below the normal-superconducting transition at T c ≈ 13 K demonstrates an effective coupling of the shear strain with the order parameter for the superconducting transition which arises indirectly as a consequence of unfavourable coupling of the superconducting order parameter with the ferroelastic order parameter. Ba(Fe 0.957 Co 0.043 ) 2 As 2 is representative of 122 pnictides as forming a class of multiferroic superconductors in which elastic strain relaxations Original content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence.

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Internal Friction Associated With Domain Walls and Ferroelastic Phase Transition in LNPP

Cited by 10 publications

References 0 publications

On the magnetostructural transition in MnCoGeB alloy ribbons

On the magnetostructural transition in MnCoGeB alloy ribbons

Elastic and anelastic relaxations associated with phase transitions inEuTiO3

Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe_0.957Co_0.043)₂As₂

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Internal Friction Associated With Domain Walls and Ferroelastic Phase Transition in LNPP

Cited by 10 publications

References 0 publications

On the magnetostructural transition in MnCoGeB alloy ribbons

On the magnetostructural transition in MnCoGeB alloy ribbons

Elastic and anelastic relaxations associated with phase transitions inEuTiO3

Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe0.957Co0.043)2As2

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Ferroelasticity, anelasticity and magnetoelastic relaxation in Co-doped iron pnictide: Ba(Fe_0.957Co_0.043)₂As₂