Dynamic Fluctuations and Static Speckle in Critical X-Ray Scattering from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>SrTiO</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math>

Holt, Martin V.; Sutton, M.; Zschack, P.; Hong, Hawoong; Chiang, T.‐C.

doi:10.1103/physrevlett.98.065501

Cited by 39 publications

(39 citation statements)

References 26 publications

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“…4a). Due to the pinning, these isolated domains are highly static, hence explaining the static speckles observed at 62 K. This phenomenon is similar in essence to the anomalous static central peak observed above structural phase transition temperature in SrTiO 3 42 . Upon further cooling toward and through T LO , the correlation length rapidly increases so that the disconnected domains merge into long-range CDWs, and it is at this point that regular CDW domain walls form (Fig.…”

Section: Resultssupporting

confidence: 65%

Distinction between pristine and disorder-perturbed charge density waves in ZrTe3

Yue

Xue

et al. 2020

Nat Commun

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Charge density waves (CDWs) in the cuprate high-temperature superconductors have evoked much interest, yet their typical short-range nature has raised questions regarding the role of disorder. Here we report a resonant X-ray diffraction study of ZrTe 3 , a model CDW system, with focus on the influence of disorder. Near the CDW transition temperature, we observe two independent signals that arise concomitantly, only to become clearly separated in momentum while developing very different correlation lengths in the well-ordered state that is reached at a distinctly lower temperature. Anomalously slow dynamics of mesoscopic charge domains are further found near the transition temperature, in spite of the expected strong thermal fluctuations. Our observations signify the presence of distinct experimental fingerprints of pristine and disorder-perturbed CDWs. We discuss the latter also in the context of Friedel oscillations, which we argue might promote CDW formation via a selfamplifying process.

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Section: Resultssupporting

confidence: 65%

Distinction between pristine and disorder-perturbed charge density waves in ZrTe3

Yue

Xue

et al. 2020

Nat Commun

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“…[14][15][16] In particular, a two component approach was developed, since a central peak emerges upon approaching T s which increases in intensity with decreasing temperature. 15,16 An explanation of this observation has been given in terms of intrinsic or quenched defects, 17,18 intrinsic effects, and quasistatic domains, 19,20 and recently been shown to be intrinsic. 11 In the following, we primarily concentrate on the x-dependent phase diagram of STO16 1−x STO18 x , which offers a unique opportunity to investigate the crossover to quantum paraelectric behavior and dimensionality crossover within the same system, and where doping induced changes of the lattice potential and dynamics can be ruled out.…”

mentioning

confidence: 91%

Dimensional crossover and absence of quantum criticality inSrTiO161−xO
Bussmann‐Holder
¹
,
Bishop
²

2008
Phys. Rev. B
9
1
5
0
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The isotope-induced ferroelectricity observed in SrTi 18 O 3 ͑STO18͒ enables a systematic study of the crossover between quantum paraelectricity and ferroelectricity as a function of x in SrTi 16 We predict that all ferroelectric compounds have a finite transition temperature T c and show a dimensionality crossover from d =3 to d = 4 at sufficiently low temperature. A discontinuity in behavior takes place around x = 0.35, where quantum fluctuations suppress the transition. No evidence is found for a quantum critical point in the phase diagram. The high temperature structural transition shows a substantial isotope dependence which is, however, less striking than for the ferroelectric transition. SrTi 16 O 3 has been known for more than 50 years and is one of the best investigated perovskite oxides. Around T s = 105 K a structural instability takes place which is accompanied by the freezing of a zone-boundary mode. 1,2 Simultaneously, a long-wavelength optic mode decreases in energy and is reminiscent of a ferroelectric instability. 3 An extrapolation of its frequency to zero suggests a ferroelectric phasetransition temperature of T c = 17 K. This instability does not take place, however, since quantum fluctuations set in and dominate the low-temperature dynamical properties. In this regime, temperature is an inappropriate parameter for a phase diagram and the dielectric properties. As a consequence the system was termed a "quantum paraelectric." 4 An analogous behavior is observed in KTaO 3 ͑Ref. 5͒ and CaTiO 3 . 6 In all these compounds ferroelectricity can be induced by sufficient doping. In SrTi 16 O 3 ͑STO16͒ Ca doping leads to finite values of T c , and an interesting crossover from a XY n = 2 quantum ferroelectric to a random field-induced domain state takes place with increased Ca doping. 7 Another route to inducing ferroelectricity in STO16 has recently been realized by replacing 16 O by its isotope 18 O. 8 Here, the instability takes place at T c = 24 K and both phases, the ferroelectric and the paraelectric ones, have subsequently been investigated in detail. 9 While long-wavelength probes such as Raman scattering or infrared studies provide evidence for a purely displacive transition with perfect mode softening, 10,11 local probes such as NMR or EPR support an order/disorder-driven phase transition. 12 That both dynamics can coexist has been shown theoretically, and this can resolve the apparent experimental controversy. 13 The higher temperature structural phase transition has been the focus of detailed experimental investigations, since it was early suggested that also here order/disorder and displacive dynamics accompany this instability. 14-16 In particular, a two component approach was developed, since a central peak emerges upon approaching T s which increases in intensity with decreasing temperature. 15,16 An explanation of this observation has been given in terms of intrinsic or quenched defects, 17,18 intrinsic effects, and quasistatic domains, 19,20 and recently been shown to be intrinsic. 11 ...

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“…The change of the lattice parameter is less than one thousandth of a percent upon the phase transition (3), which is beyond the sensitivity of current imaging techniques (4). Diffraction techniques, while showing evidences of fluctuations at temperatures above T c (1,2,5,6), generate controversial results regarding the correlation time and length scales (7)(8)(9)(10)(11) and fail to provide a microscopic picture of the onset of the phase transition as the temperature approaches T c .…”

mentioning

confidence: 99%

Observing a previously hidden structural-phase transition onset through heteroepitaxial cap response

Lan

Chen

Lin

et al. 2019

Proc. Natl. Acad. Sci. U.S.A.

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Characterization of the onset of a phase transition is often challenging due to the fluctuations of the correlation length scales of the order parameters. This is especially true for second-order structuralphase transition due to minute changes involved in the relevant lattice constants. A classic example is the cubic-to-tetragonal secondorder phase transition in SrTiO 3 (STO), which is so subtle that it is still unresolved. Here, we demonstrate an approach to resolve this issue by epitaxially grown rhombohedral La 0.7 Sr 0.3 MnO 3 (LSMO) thin films on the cubic STO (100) substrate. The shear strain induced nanotwinning waves in the LSMO film are extremely sensitive to the cubic-totetragonal structural-phase transitions of the STO substrate. Upon cooling from room temperature, the development of the nanotwinning waves is spatially inhomogeneous. Untwinned, atomically flat domains, ranging in size from 100 to 300 nm, start to appear randomly in the twinned phase between 265 and 175 K. At ∼139 K, the untwinned, atomically flat domains start to grow rapidly into micrometer scale and finally become dominant at ∼108 K. These results indicate that the low-temperature tetragonal precursor phase of STO has already nucleated at 265 K, significantly higher than the critical temperature of STO (∼105 K). Our work paves a pathway to visualize the onset stages of structural-phase transitions that are too subtle to be observed using direct-imaging methods.structural-phase transition | SrTiO 3 | La 0.7 Sr 0.3 MnO 3 | twinning | scanning tunneling microscope

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Dynamic Fluctuations and Static Speckle in Critical X-Ray Scattering fromSrTiO3

Cited by 39 publications

References 26 publications

Distinction between pristine and disorder-perturbed charge density waves in ZrTe3

Distinction between pristine and disorder-perturbed charge density waves in ZrTe3

Dimensional crossover and absence of quantum criticality inSrTiO161−xO
Bussmann‐Holder
¹
,
Bishop
²

2008
Phys. Rev. B
9
1
5
0
View full text Add to dashboard Cite

Observing a previously hidden structural-phase transition onset through heteroepitaxial cap response

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Dynamic Fluctuations and Static Speckle in Critical X-Ray Scattering fromSrTiO3

Cited by 39 publications

References 26 publications

Distinction between pristine and disorder-perturbed charge density waves in ZrTe3

Distinction between pristine and disorder-perturbed charge density waves in ZrTe3

Dimensional crossover and absence of quantum criticality inSrTiO161−xOBussmann‐Holder1, Bishop2 2008Phys. Rev. B9150View full textAdd to dashboardCite

Observing a previously hidden structural-phase transition onset through heteroepitaxial cap response

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About

Dimensional crossover and absence of quantum criticality inSrTiO161−xO
Bussmann‐Holder
¹
,
Bishop
²

2008
Phys. Rev. B
9
1
5
0
View full text Add to dashboard Cite