Proton glass state in Rb1-x(NH4) xH2AsO4

Трыбула, З.; Stankowski, J.; Szcz̀epańska, L.; Blinc, R.; Weiss, Andrew; Dalal, N. S.

doi:10.1080/00150198808229463

Cited by 20 publications

(8 citation statements)

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“…After first observation of the glass state in dielectric data for RADA x = 0.31 in 1986 [3], further measurements in the microwave region by Trybu la, Stankowski and Blinc in 1988 [4,5] showed that the phase diagram for RADA is asymmetric. Two years later this result was confirmed by Kim and Kwun [7].…”

Section: Discussionmentioning

confidence: 99%

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COEXISTENCE OF PARAELECTRIC/PROTON-GLASS AND FERROELECTRIC (ANTIFERROELECTRIC) ORDERS IN Rb_{1-x}(NH_{4})_{x}H_{2}AsO_{4} CRYSTALS

Трыбула¹,

Stankowski²

1998

Condens. Matter Phys.

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This paper reviews the results of dielectric studies of the proton glass state in a mixed crystal Rubidium Ammonium Dihydrogen Arsenate (RADA) The coexistence of paraelectric/proton glass and ferroelectric or antiferroelectric orders, confirmed by other studies, has been discussed in detail. The phase diagram of RADA is asymmetric. The proton glass state exists for ammonium concentration in the range of 0.1 < x < 0.5 . The phase diagram of deuterated DRADA is presented. The proton glass state region in DRADA, 0.2 < x < 0.35 is narrower than that for non-deuterated RADA. The effects of hydrostatic pressure on the dielectric properties in the proton glass state are presented. The glass temperature T g decreases with pressure and is expected to vanish at 5 kbar. Low temperature behaviour is still an open question, since there is no experimental evidence of T g (p) dependence below 4K for proton glass systems.

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Section: Discussionmentioning

confidence: 99%

“…This paper will focus essentially on the properties of the RADA crystal. Earlier dielectric studies gave some insight into the properties of the proton glass state [4][5][6][7]. The phase diagram for RADA obtained by those studies is unlike that for RADP, and reveals the glass state existence in the range of 0.1 x 0.5 [4,5].…”

Section: Introductionmentioning

confidence: 99%

COEXISTENCE OF PARAELECTRIC/PROTON-GLASS AND FERROELECTRIC (ANTIFERROELECTRIC) ORDERS IN Rb_{1-x}(NH_{4})_{x}H_{2}AsO_{4} CRYSTALS

Трыбула¹,

Stankowski²

1998

Condens. Matter Phys.

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“…The most complete experimental data for Rb 1−x (NH 4 ) x H 2 AsO 4 for the dielectric measurements in a wide frequency range at low temperatures can be found in [23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

“…In [23], a temperature dependence (T = 5 K-300 K) of longitudinal permittivity ε 33 (ω, T ), ε 33 (ω, T ) of Rb 1−x (NH 4 ) x H 2 AsO 4 in the millimeter frequency range is measured, and the phase diagram is constructed. In [24], the transverse ε 11 (ω, T ), ε 11 (ω, T ) and longitudinal ε 33 (ω, T ), ε 33 (ω, T ) permittivities of Rb 0.65 (NH 4 ) 0.35 H 2 AsO 4 are explored in wide temperature (T = 5 K-300 K) and frequency (ν = 1 Hz − 30 kHz) ranges.…”

Section: Introductionmentioning

confidence: 99%

Thermodynamics and complex dielectric permittivity of mixed crystals of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type

Levitsky¹,

Sorokov²,

Stankowski³

et al. 2008

Condens. Matter Phys.

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We propose a pseudospin model for proton glasses of the Rb 1−x (NH 4 )xH 2 PO 4 (Rb 1−x (ND 4 )xD 2 PO 4 ) type, which takes into account the energy levels of hydrogens (deuterons) around the PO 4 group, long-range interactions between the hydrogen bonds, and an internal random deformational field. Within the framework of a cluster approximation and a mean field approximation over the long-range interactions, we derive a system of equations for the state parameters for the regions which are in the ferroelectric and antiferroelectric states, as well as in the proton glass state. Within the Glauber dynamics approach, we obtain a system of equations for the frequency-dependent linear responses of polarization and the proton glass order parameter. We obtain a qualitative description of the temperature behavior of dielectric permittivities of the K 1−x (ND 4 )xD 2 PO 4 and Rb 1−x (NH 4 )xH 2 AsO 4 compounds at different frequencies. The origin of low-temperature peak in the imaginary part of dielectric permittivity in proton glasses is discussed.

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“…Mixed ferroelectric-antiferroelectric systems with hydrogen bonds of the Rb x (NH 4 ) 1−x H 2 PO 4 type in which a spin glass state is realized at low temperatures (proton glasses) have been intensively studied both experimentally [1][2][3] and theoretically [2,[4][5][6][7] for more than two decades. In early works [4,5] they were described by a spin system with short-range interactions, that is, in terms of the energy structure of a cluster consisting of a PO 4 group and protons on hydrogen bonds attached to it.…”

Section: Introductionmentioning

confidence: 99%

Spin Models With Different Types of Competing Interactions

Левицкий¹,

Sorokov²,

Vdovych³

2005

Ferroelectrics

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We consider a spin-glass model with an arbitrary range of competing interactions within two-particle cluster approximation for the free energy and within symmetric replica approach. We show that for the thermodynamic characteristics, the Gaussian approximation for distribution functions of cluster (short-range) fields can be used. For a simple proton-glass model with weak long-range interactions (linear approximation) we study the influence of the long-range interactions and random internal fields on the phase diagram and thermodynamics characteristics. It is shown that small fluctuations of internal fields can lead to essential smearing of spin-glass transition region.

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Proton glass state in Rb1-x(NH4) xH2AsO4

Cited by 20 publications

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COEXISTENCE OF PARAELECTRIC/PROTON-GLASS AND FERROELECTRIC (ANTIFERROELECTRIC) ORDERS IN Rb_{1-x}(NH_{4})_{x}H_{2}AsO_{4} CRYSTALS

COEXISTENCE OF PARAELECTRIC/PROTON-GLASS AND FERROELECTRIC (ANTIFERROELECTRIC) ORDERS IN Rb_{1-x}(NH_{4})_{x}H_{2}AsO_{4} CRYSTALS

Thermodynamics and complex dielectric permittivity of mixed crystals of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type

Spin Models With Different Types of Competing Interactions

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