Stokes to anti-Stokes intensity ratio in Raman spectra of the soft mode in KH2PO4 near the phase transition temperature

Watanabe, Junji; Yoshida, Ryohei; Iwane, S.; Kinoshita, Shūichi

doi:10.1016/j.jnoncrysol.2007.08.078

Cited by 3 publications

(2 citation statements)

References 16 publications

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“…This peak was tentatively regarded as a soft "ferroelectric-mode" of a displacive transition driven by collective proton-tunneling coupled with heavy atoms [32][33][34]. However, subsequent studies of the spectral profile suggest a symmetrical quasi-elastic peak instead of the asymmetrical profile of a soft-mode [35][36][37]. This new interpretation accords with the single-exponential decay on the 10 −11 s time-scale of the signal induced by stimulated Raman [38].…”

Section: Introductionmentioning

confidence: 71%

Quantum interferences revealed by neutron diffraction accord with a macroscopic-scale quantum-theory of ferroelectrics KH2(1−ρ)D2ρ PO4

Cousson

2016

Eur. Phys. J. B

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Neutron diffraction by single-crystals KH 2(1−ρ) D2ρPO4 at 293 K reveal quantum interferences consistent with a static lattice of entangled proton-deuteron scatterers. These crystals are represented by a macroscopic-scale condensate of phonons with continuous space-time-translation symmetry and zeroentropy. This state is energetically favored and decoherence-free over a wide temperature-range. Projection of the crystal state onto a basis of four electrically-and isotopically-distinct state-vectors accounts for isotope and pressure effects on the temperature of the ferroelectric-dielectric transition, as well as for the latent heat. At the microscopic level, an incoming wave realizes a transitory state either in the space of static positional parameters (elastic scattering) or in that of the symmetry species (energy transfer). Neutron diffraction, vibrational spectroscopy, relaxometry and neutron Compton scattering support the conclusion that proton and deuteron scatterers are separable exclusively through resonant energy-transfer.

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Section: Introductionmentioning

confidence: 71%

Quantum interferences revealed by neutron diffraction accord with a macroscopic-scale quantum-theory of ferroelectrics KH2(1−ρ)D2ρ PO4

Cousson

2016

Eur. Phys. J. B

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“…10 figure out that the shape around the central peak is symmetric, i. e., the I S /I AS of the central mode equals 1 for liquid CS 2 and KH 2 PO 4 . 11 The frequency region that I S /I AS becomes 1 is ν < 3 cm −1 for CS 2 and ν < 2 cm −1 for KH 2 PO 4 at 146.7K. The frequency region I S /I AS = 1 corresponds to the exponential decay tail in the OKE signal.…”

Section: -9mentioning

confidence: 89%

So-called ‘relaxation’ mode located at 0.1 cm−1 in the low-frequency Raman spectra of ethylene glycol - acetone mixtures

2016

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Low frequency Raman spectra of ethylene glycol(EG) and acetone mixtures are investigated by high-resolution double monochrometer. A broad peak located at 0.1 cm−1 in susceptibility spectra is compared with the dielectric loss spectra. Both Raman relaxation time(τMRT1) and dielectric relaxation time(τD1) are determined by the model fitting method. The ratio τMRT1/τD1 does not depend on static dielectric constant of mixtures and is almost constant, ≈3.2, from 1.0 (pure EG) to 0.3 mole fraction. This result indicates that both τMRT1 and τD1 are determined by the same molecular dynamics.

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Boltzmann constant determined by fluorescent spectroscopy for verifying thermometers

Zhang

Gao

2013

Front. Optoelectron.

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Stokes to anti-Stokes intensity ratio in Raman spectra of the soft mode in KH2PO4 near the phase transition temperature

Cited by 3 publications

References 16 publications

Quantum interferences revealed by neutron diffraction accord with a macroscopic-scale quantum-theory of ferroelectrics KH2(1−ρ)D2ρ PO4

Quantum interferences revealed by neutron diffraction accord with a macroscopic-scale quantum-theory of ferroelectrics KH2(1−ρ)D2ρ PO4

So-called ‘relaxation’ mode located at 0.1 cm−1 in the low-frequency Raman spectra of ethylene glycol - acetone mixtures

Boltzmann constant determined by fluorescent spectroscopy for verifying thermometers

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