Light scattering study op the phase transition in TSCC

Prokhorova, S. D.; Smolensky, G. A.; Siny, I. G.; Kuzminov, E. G.; Mikvabia, V. D.; Arndt, H.

doi:10.1080/00150198008207087

Cited by 53 publications

(6 citation statements)

References 7 publications

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“…Compared with typical ferroelectrics, [Ca(CH 3 NH 2 CH 2 COO) 3 Cl 2 ] shows peculiar properties such as small C para (∼58 K), small P s (0.27 μC·cm –2 at 78 K), and relatively large entropy change Δ S (2.51 J·K –1 ·mol –1 ) (Figure ). , These observations reveal that the phase transition of (CH 3 NH 2 CH 2 COO) 3 ·CaCl 2 is of order–disorder type. However, later studies confirm that the phase transition is of displacive type. − …”

Section: Amino Acid Familymentioning

confidence: 97%

Ferroelectric Metal–Organic Frameworks

2011

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Section: Amino Acid Familymentioning

confidence: 97%

Ferroelectric Metal–Organic Frameworks

2011

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“…mode also drops and traces the temperature dependence of the TO mode (but remains finite) [27][28][29]. 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).…”

Section: Figmentioning

confidence: 99%

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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“…Some of the nine elastic constants (in units of 101° Nm2: c~1 = 3.75, C22 = 4.24, c12 = 2.23, c66 =0.64 and c44 + c55 = 1.6) are known from Brillouin spectroscopy (Prokhorova, Smolensky, Siny, Kuzminov, Mikvabia & Arndt, 1980). For an estimation of the elastic anisotropy, we make use of the pseudohexagonal symmetry.…”

Section: Results From Partly Deuterated Tris(sarcosine) Calcium Chloridementioning

confidence: 99%

Thermal diffuse scattering in time-of-flight neutron diffraction studies on SBN and TSCC single crystals

Prokert¹,

Савенко²,

Балагуров³

1995

Acta Cryst Sect A

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Thermal diffuse scattering (TDS) from single crystals of barium strontium niobate (SBN) and from a partly deuterated single crystal of tris(sarcosine) calcium chloride (TSCC) measured on the time-of-flight (TOF) Lane single-crystal diffractometer DN-2/IBR-2, Dubna, Russia, are presented. Various characteristic distributions of the TDS were measured and could be interpreted for the elastically (nearly) isotropic SBN crystals as well as for the anisotropic TSCC sample in accordance with the theory. The velocities of sound propagation are determined in both cases. Temperature-dependent changes of the TDS are qualitatively analysed for SBN crystals.

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Light scattering study op the phase transition in TSCC

Cited by 53 publications

References 7 publications

Ferroelectric Metal–Organic Frameworks

Ferroelectric Metal–Organic Frameworks

Quantum criticality in a uniaxial organic ferroelectric

Thermal diffuse scattering in time-of-flight neutron diffraction studies on SBN and TSCC single crystals

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