Dielectric properties of solid solutions of trissarcosine calcium chloride (TSCC) and bromide (TSCB)

Fujimoto, Sanji; Yasuda, Naohiko; Kashiki, H; Takagi, Kimiaki; Fujimoto, Masahiro

doi:10.1080/00150198108219588

Cited by 14 publications

(7 citation statements)

References 10 publications

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“…The size of the spontaneous polarization in all the ferroelectric samples [30] , and the peak value of the dielectric constant in all the samples measured, is very small (less than 10). Moreover the peak value gets progressively smaller as the level of bromine doping increases and as T C is progressively suppressed towards zero [31].…”

Section: Figmentioning

confidence: 97%

“…Firstly, the splitting of the frequencies of transverse (TO) and longitudinal (LO) modes in TSCC is very small (∼50 GHz) and as the TO mode approaches zero at the Curie point the LO mode also drops and traces the temperature dependence of the TO mode (but remains finite) [33][34][35]. The magnitude of the spontaneous polarization in all the ferroelectric samples [36], and the peak value of the dielectric permitivity in all the samples measured, is very small (less than 10). Moreover the peak value gets progressively smaller as the level of bromine doping increases and as T C is progressively suppressed towards zero [28].…”

Section: Dielectric Susceptibilitymentioning

confidence: 99%

“…Some authors [21,36,37] have defined a 'bare' Curie constant 1/ which varied linearly with T, i.e. in the classical Curie-Weiss regime of the inverse susceptibility.…”

Section: Dielectric Susceptibilitymentioning

confidence: 99%

“…Ref. [30]) of the spontaneous polarization PS for different bromine doping levels using the relation C(TC,1)/C(TC,2) = P 2 S (TC,1)/P 2 S (TC,2) from Eq. 8.…”

Section: Figmentioning

confidence: 99%

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Quantum criticality in a uniaxial organic ferroelectric

Rowley

Hadjimichael

Ali

et al. 2015

J. Phys.: Condens. Matter

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Tris-sarcosine calcium chloride (TSCC) is a highly uniaxial ferroelectric with a Curie temperature of approximately 130K. By suppressing ferroelectricity with bromine substitution on the chlorine sites, pure single crystals were tuned through a ferroelectric quantum phase transition. The resulting quantum critical regime was investigated in detail -the first time for a uniaxial ferroelectric and for an organic ferroelectric -and was found to persist up to temperatures of at least 30K to 40K. The nature of long-range dipole interactions in uniaxial materials, which lead to non-analytical terms in the free-energy expansion in the polarization, predict a dielectric susceptibility varying as 1/T 3 close to the quantum critical point. Rather than this, we find that the dielectric susceptibility varies as 1/T 2 as expected and observed in better known multi-axial systems. We explain this result by identifying the ultra-weak nature of the dipoles in the TSCC family of crystals. Interestingly we observe a shallow minimum in the inverse dielectric function at low temperatures close to the quantum critical point in paraelectric samples that may be attributed to the coupling of quantum polarization and strain fields. Finally we present results of the heat capacity and electro-caloric effect and explain how the time dependence of the polarization in ferroelectrics and paraelectrics should be considered when making quantitative estimates of temperature changes induced by applied electric fields.There has been a great deal of interest recently in the field of ferroelectric quantum phase transitions [1,2]. A chief reason for this is that the properties of ferroelectrics may be readily tuned with gate voltages and strains, which make quantum ferroelectrics and paraelectrics particularly suited for applications in advanced cryogenic electronics. Highlighting SrTiO 3 as an example, one sees that a pristine optically transparent insulator with a band gap of more than 3eV, and a static dielectric constant greater than 10 4 , may be tuned through an insulator to metal to superconductor transition and back again with the application of just a few volts [3,4]. On the other hand modest strains [5], chemical doping [6] or isotope substitution [1,7], can induce ferroelectricity in an otherwise paraelectric ground state. Ferroelectric quantum critical fluctuations have been observed up to temperatures higher than those often seen in other systems, and over a wide range of tuning parameters. Proximity to a displacive ferroelectric quantum critical point where the transverse optical phonon frequency becomes very small, and the dielectric function can rise to very high values, is believed to be of importance in understanding superconductivity in materials such as chemically doped [8] or ionic-liquid-gated SrTiO 3 [7] and KTaO 3 [4], and in oxide interface materials [9] to name just a few.The nature of quantum criticality in ferroelectrics is strikingly different from that found in other systems, for example magnetic systems [1,10,11]. Quantu...

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Section: Figmentioning

confidence: 97%

Section: Dielectric Susceptibilitymentioning

confidence: 99%

“…Some authors [21,36,37] have defined a 'bare' Curie constant 1/ which varied linearly with T, i.e. in the classical Curie-Weiss regime of the inverse susceptibility.…”

Section: Dielectric Susceptibilitymentioning

confidence: 99%

“…Ref. [30]) of the spontaneous polarization PS for different bromine doping levels using the relation C(TC,1)/C(TC,2) = P 2 S (TC,1)/P 2 S (TC,2) from Eq. 8.…”

Section: Figmentioning

confidence: 99%

See 2 more Smart Citations

Quantum criticality in a uniaxial organic ferroelectric

Rowley

Hadjimichael

Ali

et al. 2015

J. Phys.: Condens. Matter

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show abstract

“…Although the isomorphous Tris-Sarcosine Calcium Bromide (TSSB) does not show ferroelectricity down to liquid helium temperature [22], in the mixed crystal systems of the chloride and bromide, TSSC 1−x Br x , ferroelectricity exists for x≤0.75 [23]. It is also reported that [24] the transition temperature T C in TSSC 1−x Br x decreases as x increases.…”

Section: Introductionmentioning

confidence: 99%

Calculation of the Halfwidth and the Activation Energy for the Soft Raman Modes in the Brominated Compounds of Tris-Sarcosine Calcium Chloride

Kiraci

2022

Trends Sci

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This letter contributes how to calculate the anomalous behavior for the damping constant (halfwidth) of the ferroelectric Tris-Sarcosine Calcium Chloride (TSSC) and its brominated compounds TSSC1−xBrx (x = 0.13, 0.42 and 0.60) from the wavenumber data of the soft modes below the phase transition temperature of TC. The pseudospin-phonon coupled (PS) and the energy fluctuation (EF) models derived from the dynamical Ising model were used. Both PS and EF models have been used to contribute understanding the temperature dependence of the phase transition mechanism of TSSC1−xBrx. In addition, values of the activation energy for TSSC1−xBrx (x = 0, 0.13, 0.42 and 0.60) were extracted from the damping constant as calculated from both models (PS and EF). Our results indicate order-disorder type phase transition for TSSC1−xBrx. HIGHLIGHTS This work contributes how to calculating the critical behavior of the halfwidth for the soft Raman modes in ferroelectric TSSC1-xBrx (x = 0, 0.13, 0.42 and 0.60) liquid crystals from their observed wavenumbers data. Also, the values of the activation energy close to the ferroelectric-paraelectric phase transition of these crystals was deduced. This calculation of the halfwidth and the activation energy were performed using the pseudospin-phonon coupled (PS) and the energy fluctuation (EF) models in the ferroelectric phases (T < TC) of the crystals studied here. GRAPHICAL ABSTRACT

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