Proton glass state in Rb1−x(NH4)xH2AsO4

Трыбула, З.; Stankowski, J.; Szcz̀epańska, L.; Blinc, R.; Weiss, Al.; Dalal, Naresh S.

doi:10.1016/0921-4526(88)90040-3

Cited by 49 publications

(14 citation statements)

References 12 publications

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“…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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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: 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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“…For intermediate x-values no long range ordering takes place and the system forms at low temperatures a "proton" or "deuteron" dipolar glass [4,5]. In contrast to isomorphous Rb 1 _ x (ND 4 ) x D 2 P0 4 [4,5] the phase diagram is not symmetric [2] as the paraelectric-antiferroelectric transition temperature is much higher than the paraelectric-ferroelectric one.…”

Section: Effects Of Impurities and Random Fields On Phase Transimentioning

confidence: 92%

NQR in Dipolar and Quadrupolar Glasses

Blinc

1990

Zeitschrift Für Naturforschung A

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It is shown that nuclear quadrupole resonance and quadrupole perturbed magnetic resonance represent a powerful technique to determine the local polarization distribution and its second moment, the Edwards-Anderson order parameter, in proton and deuteron glasses. For quadrupolar glasses the local orientational distribution function can be determined from the inhomogeneous NMR or NQR lineshape, thus allowing for a measurement of the quadrupolar Edwards-Anderson order parameter. The comparison of the temperature dependences of the thus obtained order parameters with theoretical predictions then allows for a discrimination between the different possible models of the glassy transition.

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“…Кристали з водневими зв'язками типу Rb 1−x (NH 4 ) x H 2 PO 4 , в яких при низьких температурах реалiзується стан протонного скла, iнтенсивно вивчаються експериментально [1]- [3] i теоретично [2], [4]- [7] вже бiльше 10 рокiв.…”

Section: вступunclassified

“…В наступних роботах використовують простi спiновi моделi з безмежним радiусом для середнього значення i дисперсiї ви-падкової взаємодiї [2,6,7]. Все-таки, адекватне врахування всiх типiв взаємодiй (як короткосяжних так i далекосяжних) в таких системах до тепер залишається важливою теоретичною проблемою.…”

Section: вступunclassified

Spin-glass model with essential short-range competing interactions

Sorokov¹,

Levitskii²,

Vdovych³

2005

Condens. Matter Phys.

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We consider a proton-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 fields can be used. For a simpler proton-glass model with weak long-range interactions (linear approximation) we study the effect 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 proton-glass transition region. The adaptability of the theory for a description of proton-glasses of Rb_1-x(NH₄)_xH₂PO₄-type is discussed

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Proton glass state in Rb1−x(NH4)xH2AsO4

Cited by 49 publications

References 12 publications

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

NQR in Dipolar and Quadrupolar Glasses

Spin-glass model with essential short-range competing interactions

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