Low-Frequency Dielectric Loss of Triglycine Sulfate

Courtens, E.

doi:10.1103/physrevlett.51.844

Cited by 7 publications

(5 citation statements)

References 9 publications

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“…Despite the fact that, due to the low losses of the material, the data points reveal large uncertainties at radio frequencies, a power-law behavior, namely e2us is obeyed over six decades in frequency. Any description of these data in terms of a distribution of relaxation times needs a distribution function g (7) covering at least 20 decades. The inset shows the frequency dependent data for x = 0.33 at audio frequencies.…”

Section: Resultsmentioning

confidence: 99%

Linear and nonlinear dielectric spectroscopy in dipolar glasses

Loidl¹,

Winterlich²,

Ries³

et al. 1996

Ferroelectrics

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Two dipolar glass systems are investigated by broadband dielectric spectroscopy. The two systems under investigation, NH.I:KI and solid solutions of deuterated betaine phosphate and betaine phosphite (BP BPI), reveal very different freezing scenarios. The dielectric loss in NH.IKI is characterized by a powerlaw behavior on frequency &" -Y', indicative for the nearequilibrium dynamics in the glass phase. The deuterated proton glass D-BPBPI (40:60) exhibits a relaxational-type of freezing transition. Measurements of the nonlinear susceptibility and of the field cooled and zero-field cooled susceptibility provide clear evidence for a "static" dipolar glass transition at T, -28 K ? 2 K.

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Section: Resultsmentioning

confidence: 99%

Linear and nonlinear dielectric spectroscopy in dipolar glasses

Loidl¹,

Winterlich²,

Ries³

et al. 1996

Ferroelectrics

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“…At room temperature, the STO crystal is cubic and optically isotropic without birefringence. [ 40,41 ] With a static strain applied, the anisotropic lattice deformation can drive the STO from centrosymmetric to non‐centrosymmetric and then bring a static birefringence. [ 40–42 ] Here, the coherent phonons are created by ultrafast laser pumping, and such strain wave could induce transient lattice deformation as well as its birefringence.…”

Section: Resultsmentioning

confidence: 99%

“…[ 40,41 ] With a static strain applied, the anisotropic lattice deformation can drive the STO from centrosymmetric to non‐centrosymmetric and then bring a static birefringence. [ 40–42 ] Here, the coherent phonons are created by ultrafast laser pumping, and such strain wave could induce transient lattice deformation as well as its birefringence. [ 18 ] To explore this issue, the time‐resolved polarization rotation angle measurement (TR‐Δ θ R ) is employed as schematically shown in Figure 3d.…”

Section: Resultsmentioning

confidence: 99%

“…Intrinsic optical birefringence originates from the intrinsic lattice anisotropy of the crystal. [ 40 ] In this context, it is worthy to explore the crystal orientation effects on both coherent phonons and its induced birefringence. For the coherent phonons, as shown in Figure a, the amplitudes of coherent phonons ( A osc of ∆R/R 0 ) in LRO/STO (110) and LRO/STO (001) are larger than that in LRO/STO (111).…”

Section: Resultsmentioning

confidence: 99%

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Coherent Phonon‐Induced Gigahertz Optical Birefringence and Its Manipulation in SrTiO₃

et al. 2023

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Birefringence, which modulates the polarization of electromagnetic wave, has been commercially developed and widely used in modern photonics. Fostered by high-frequency signal processing and communications, feasible birefringence technologies operating in gigahertz (GHz) range are highly desired. Here, a coherent phonon-induced GHz optical birefringence and its manipulation in SrTiO 3 (STO) crystals are demonsrated. With ultrafast laser pumping, the coherent acoustic phonons with low damping are created in the transducer/STO structures. A series of transducer layers are examined and the optimized one with relatively high photon-phonon conversion efficiency, i.e., semiconducting LaRhO 3 film, is obtained. The most intriguing finding here is that, by virtue of high sensitivity to strain perturbation of STO, GHz optical birefringence can be induced by the coherent acoustic phonons and the birefringent amplitudes possess crystal orientation dependence. Optical manipulation of both coherent phonons and its induced GHz birefringence by double pump technique are also realized. These findings reveal an alternative mechanism of ultrafast optical birefringence control, and offer prospects for applications in high-frequency acoustic-optics devices.

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“…It is important to know whether the freezing of 'spins' or clusters of spins into a random orientation is a local nonequilibrium dynamic process or a real equilibrium phase transition with an infinite correlation length below a well-defined critical temperature. The first report of the formation of a dipolar glass in hydrogen-bonded ferroelectrics was by Courtens [4,5]; the phase diagram of the glass formation and other aspects were discussed in detail by Courtens [6]. Among the important and established findings on RADP are: (i) the motion of NH + 4 freezes in the glassy phase at temperatures much higher than the freezing temperature of the proton system in the O-H• • •O network and the ammonium ion dynamics has no direct relation to glass formation [7,8]; (ii) the pressure dependence of the dynamic glass transition temperature, T m , of RADP(x = 0.5) by Samara [9] led to the important finding that dT m /dP is finite as T m → 0, which revealed the nonequilibrium nature of the glass transition in RADP.…”

Section: Introductionmentioning

confidence: 99%

Dynamical effects and ergodicity in the dipolar glass phase: evidence from time-domain EPR and phase memory time studies of AsO₄⁴⁻in Rb_1−x(NH₄)_xH₂PO₄ (x= 0,0.5,1)

Sastry¹,

Gustafsson²,

Danilczuk³

et al. 2006

J. Phys.: Condens. Matter

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Three-pulse electron spin echo envelope modulation (ESEEM), hyperfine sublevel correlation spectroscopy (HYSCORE) investigations and two-pulse electron spin echo (ESE) measurements of phase memory time T(M), were carried out, in the 20-200 K temperature range, on an AsO(4)(4-) paramagnetic probe stabilized in RbH(2)PO(4) (RDP), NH(4)H(2)PO(4) (ADP), and dipolar glass Rb(0.5)(NH(4))(0.5)H(2)PO(4) (RADP). The results obtained on ADP revealed hyperfine interaction of the probe ion with the (14)N of the ammonium ion, the coupling constant satisfying the condition of 'cancellation' at a field of 480 mT. The ammonium ion was found to be in two different sites in ADP, which became indistinguishable on the formation of dipolar glass RADP. These results were confirmed by HYSCORE spectral measurements. The fast Fourier transform (FFT) spectra of three-pulse ESEEM decays have clearly revealed the interaction with protons in the [Formula: see text] bond both in ADP and RDP; and in RADP with an averaged coupling constant. The phase memory times in RADP exhibited strong temperature dependence and were found to be dependent on the nuclear spin quantum number m(I) of (75)As. The temperature dependence of T(M) exhibited a well-defined maximum around 90 K, coinciding with the temperature of onset of 'freezing' in Rb(0.5)(NH(4))(0.5)H(2)PO(4). This is symptomatic of dynamic fluctuations in the dipolar glass phase, with onset around 150 K, going through a maximum around 90 K and slowing down on further cooling. These results suggest that in RADP, a dynamical mechanism with progressive slowing down below 90 K is operative in the glass formation. This implies that the RADP system, with x = 0.5, exists in an ergodic relaxor (R)-state in the 20-200 K temperature range wherein every fluctuating monodomain can be viewed as statistically representative of the whole sample.

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Low-Frequency Dielectric Loss of Triglycine Sulfate

Cited by 7 publications

References 9 publications

Linear and nonlinear dielectric spectroscopy in dipolar glasses

Linear and nonlinear dielectric spectroscopy in dipolar glasses

Coherent Phonon‐Induced Gigahertz Optical Birefringence and Its Manipulation in SrTiO₃

Dynamical effects and ergodicity in the dipolar glass phase: evidence from time-domain EPR and phase memory time studies of AsO₄⁴⁻in Rb_1−x(NH₄)_xH₂PO₄ (x= 0,0.5,1)

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Low-Frequency Dielectric Loss of Triglycine Sulfate

Cited by 7 publications

References 9 publications

Linear and nonlinear dielectric spectroscopy in dipolar glasses

Linear and nonlinear dielectric spectroscopy in dipolar glasses

Coherent Phonon‐Induced Gigahertz Optical Birefringence and Its Manipulation in SrTiO3

Dynamical effects and ergodicity in the dipolar glass phase: evidence from time-domain EPR and phase memory time studies of AsO44−in Rb1−x(NH4)xH2PO4 (x= 0,0.5,1)

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Coherent Phonon‐Induced Gigahertz Optical Birefringence and Its Manipulation in SrTiO₃

Dynamical effects and ergodicity in the dipolar glass phase: evidence from time-domain EPR and phase memory time studies of AsO₄⁴⁻in Rb_1−x(NH₄)_xH₂PO₄ (x= 0,0.5,1)