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1.


   
    Improper ferroelectric phase due to condensation of two order parameters in crystals of high-temperature superconductors / G. M. Chechin [et al.] // Ferroelectrics. - 1992. - Vol. 130, Is. 1. - P. 155-162. - Cited References: 21 . - ISSN 0015-0193
Рубрики:
TRANSITIONS
   FERROELASTICS
   RB3CD2CL7
Кл.слова (ненормированные):
Ceramic materials -- Crystals -- Ferroelectricity -- Phase diagrams -- Order parameters -- Oxide superconductors -- High temperature superconductors
Аннотация: Using group-theoretical methods it is shown that improper ferroelectric phase may arise in high-temperature superconductors (HTSC) where high-symmetry phases have space groups D4h1 or D4h17. Their appearance is caused by condensation of order parameters (OP's) transforming two irreducible representations (IR's). The most typical phase diagrams are considered, as well as temperature dependence of OP's and the basic structural mechanism of the ferroelectricity arising in the HTSC.

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Держатели документа:
Rostov-on-Don Univ, Rostov, Russian Federation

Доп.точки доступа:
Chechin, G. M.; Sakhnenko, V. P.; Misyul, S. V.; Мисюль, Сергей Валентинович; Aleksandrov, K. S.; Александров, Кирилл Сергеевич
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2.


   
    Effect of hydrostatic-pressure on modulated phases in Rb2ZnBr4 / K. PARLINSKI [et al.] // Phys. Rev. B. - 1992. - Vol. 46, Is. 1. - P. 106-114, DOI 10.1103/PhysRevB.46.106. - Cited References: 36 . - ISSN 0163-1829
РУБ Physics, Condensed Matter
Рубрики:
INCOMMENSURATE PHASES
   NEUTRON-SCATTERING
   X-RAY
   COMMENSURATE
   TRANSITIONS
   EVOLUTION
   MODEL
   WAVE
Аннотация: Neutron-diffraction studies on modulated Rb2ZnBr4, carried out under hydrostatic pressure, revealed two new commensurate phases characterized by wave vectors q = 2/7b* and q = 1/4b*, respectively. The first order phase transition between them is revealed by the coexistence of two distinct peaks in the diffraction pattern. The observed pressure-temperature phase diagram contains: the above-mentioned phases, the ferroelectric commensurate phase q = 1/3, and a region characterized by wave-vector values in the interval q = 2/7-1/3. In this region the modulation wave vector exhibits stepwise behavior as a function of pressure, but remains nearly constant iii temperature runs. We have found in this region a characteristic memory effect in which two temperature runs performed at the same pressure lead to two different modulation wave-vector values, while only the thermal history of the sample is different in the two runs. At ambient pressure we confirm the presence of a multipeaked diffraction pattern just above the lock-in transition to the commensurate q = 1/3 phase. At 122 K the phase transition from the 1/3 phase to the 1/4 phase is detected in pressure scans. The transition mechanism involves the q = 2/7 phase, at least as a metastable intermediate phase.

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Держатели документа:
INST NUCL PHYS,PL-31342 KRAKOW,POLAND
LV KIRENSKY PHYS INST,KRASNOYARSK 660036,USSR
ИФ СО РАН
Institut Laue-Langevin, 156X Centre de Tri, 38042 Grenoble, France
Institute of Nuclear Physics, ul. Radzikowskiego 152, 31-342 Cracow, Poland
L. V. Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Institut f?r Kristalographie, Rheinisch-Westfalische Technische Hochschule Aachen, Aachen, Germany
Institut f?r Festkorperforschung, Kernforschungsanlage J?lich G.m.b.H., J?lich D-5170, Germany

Доп.точки доступа:
PARLINSKI, K.; CURRAT, R.; VETTIER, C.; ALEKSANDROVA, I. P.; Александрова, Инга Петровна; ECKOLD, G.
}
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3.


    GOREV, M. V.
    PHASE-P-T DIAGRAMS OF CS2RBDYF6 AND CS2NATMBR6 ELPASOLITES / M. V. GOREV, I. N. FLEROV // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 8. - P. 2614-2618. - Cited References: 14 . - ISSN 0367-3294
РУБ Physics, Condensed Matter
Рубрики:
THERMODYNAMIC PROPERTIES
   TRANSITIONS
   CS2NANDCL6
   PRESSURE
   MODE

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Доп.точки доступа:
FLEROV, I. N.
}
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4.


   
    P = T-PHASE DIAGRAMS OF ELPASOLITES RB2KB3+F6(B3+ = HO,DY,TB) / M. V. GOREV [и др.] // Fiz. Tverd. Tela. - 1993. - Vol. 35, Is. 4. - P. 1022-1027. - Cited References: 16 . - ISSN 0367-3294
РУБ Physics, Condensed Matter
Рубрики:
RIGID SPHERE MODEL
   RB2KMIIIF6 ELPASOLITES
   TRANSITIONS
   ORDER

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Доп.точки доступа:
GOREV, M. V.; FLEROV, I. N.; VORONOV, V. N.; MISYUL, S. V.
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5.


   
    T-x phase diagram of mixed elpasolites Rb2KGaxSc1-xF6 / M. V. Gorev [и др.] // Izv. Akad. Nauk Ser. Fiz. - 1998. - Vol. 62, Is. 8. - P. 1532-1536. - Cited References: 12 . - ISSN 1026-3489
РУБ Physics, Multidisciplinary
Рубрики:
RB2KMIIIF6 ELPASOLITES
   TRANSITIONS
   FERROELASTICS
   RB2KFEF6

WOS

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Flerov, I. N.; Флёров, Игорь Николаевич; Bovina, A. F.; Бовина, Ася Федоровна; Chernenko, T. V.; Tressand, A.; Grannes, J.; International Seminar on Physics of Ferroelastics(2 ; 1997 ; Jun 25-27 ; Kazan, Russia)
}
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6.


   
    T-x phase diagram of solid solutions RbxK1-xLiSO4 / S. V. Melnikova [и др.] // Izv. Akad. Nauk Ser. Fiz. - 1998. - Vol. 62, Is. 8. - P. 1537-1540. - Cited References: 4 . - ISSN 1026-3489
РУБ Physics, Multidisciplinary
Рубрики:
TRANSITIONS
   CRYSTALS

WOS

Доп.точки доступа:
Melnikova, S. V.; Grankina, V. A.; Bandarenko, G. V.; Gorev, M. V.; International Seminar on Physics of Ferroelastics(2 ; 1997 ; Jun 25-27 ; Kazan, Russia)
}
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7.


    Gorev, M. V.
    Thermodynamic properties and p-T phase diagrams of (NH4)(3)M3+F6 cryolites (M3+: Ga, Sc) / M. V. Gorev, I. N. Flerov, A. . Tressaud // J. Phys.: Condens. Matter. - 1999. - Vol. 11, Is. 39. - P. 7493-7500, DOI 10.1088/0953-8984/11/39/306. - Cited References: 19 . - ISSN 0953-8984
РУБ Physics, Condensed Matter
Рубрики:
TRANSITIONS
   CRYSTALS
Аннотация: Calorimetric and high pressure experiments are used to establish thermodynamic features of (NH4)(3)M3+F6 cryolites with M3+: Ga, Sc as they undergo one and three structural phase transitions, respectively. The heat capacity measurements performed between 80 K and 370 K, using an adiabatic calorimeter, have shown that all phase transitions under study are first order with different closeness to the tricritical point. The total entropy change in the Sc compound connected with the successive transformations is almost equal to the entropy change in the Ga cryolite. The effect of hydrostatic pressure has been studied up to 0.6 GPa, using differential thermographic analysis. The p-T phase diagrams of both cryolites were found to be rather complicated, including triple points. The experimental results are considered as connected with order-disorder phase transitions.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Bordeaux 1, CNRS, Inst Chim Mat Condensee, F-33608 Pessac, France
ИФ СО РАН
L V Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
Inst. Chim. Matiere Cond. Bordeaux, CNRS, Universite Bordeaux I, 33608 Pessac Cedex, France

Доп.точки доступа:
Flerov, I. N.; Флёров, Игорь Николаевич; Tressaud, A.; Горев, Михаил Васильевич
}
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8.


   
    Polarization-optical and X-ray diffraction investigations on the symmetry of distorted phases of ammonium cryolite (NH4)(3)ScF6 / S. V. Mel'nikova [et al.] // Phys. Solid State. - 2000. - Vol. 42, Is. 2. - P. 345-349, DOI 10.1134/1.1131210. - Cited References: 12 . - ISSN 1063-7834
РУБ Physics, Condensed Matter
Рубрики:
TRANSITIONS
Аннотация: Single-crystal plates of different sections of the (NH4)(3)ScF6 crystal have been investigated by polarization-optical microscopy and X-ray diffraction over a wide temperature range, including the temperatures of two known phase transitions and the third transition found recently. It is established that the symmetry of phases changes in the following sequence: O-h(5) - Fm3m (Z = 4) ↔ C-2h(5) - P12(1)/n1 (Z = 2)↔ C-2h(3) -I12/m1 (Z = 16) ↔ C-i(1) - I (l) over bar (Z = 16). (C) 2000 MAIK "Nauka/Interperiodica".

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Держатели документа:
Russian Acad Sci, Kirenskii Inst Phys, Siberian Div, Krasnoyarsk 660036, Russia
Krasnoyarsk State Agr Univ, Krasnoyarsk 660049, Russia
ИФ СО РАН

Доп.точки доступа:
Mel'nikova, S. V.; Мельникова, Светлана Владимировна; Misyul', S. V.; Мисюль, Сергей Валентинович; Bovina, A. F.; Бовина, Ася Федоровна; Afanas'ev, M. L.
}
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9.


    Flerov, I. N.
    Heat capacity and p-T phase diagrams of the ordered perovskites Pb2MgWO6 and Pb2CoWO6 / I. N. Flerov, M. V. Gorev, P. . Sciau // J. Phys.: Condens. Matter. - 2000. - Vol. 12, Is. 5. - P. 559-567, DOI 10.1088/0953-8984/12/5/304. - Cited References: 25 . - ISSN 0953-8984
РУБ Physics, Condensed Matter
Рубрики:
CRYSTAL-STRUCTURE
   X-RAY
   TRANSITIONS
   PRESSURE
Аннотация: The heat capacities of Pb2MgWO6 and Pb2CoWO6 and the effect of hydrostatic pressure on the phase transitions have been studied on powdered samples by means of an adiabatic calorimeter and DTA performed under pressure, respectively. Thermodynamic parameters, such as change of total excess entropy, latent hear and hysteresis of the phase transition temperature were determined. Entropies and p-T phase diagrams are discussed in connection with structural data.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
CNRS, CEMES, F-31055 Toulouse, France
ИФ СО РАН
L V Kirensky Institute of Physics, 660036 Krasnoyarsk, Russian Federation
CEMES-CNRS, 29 rue Jeanne Marvig, 31055 Toulouse, France

Доп.точки доступа:
Gorev, M. V.; Горев, Михаил Васильевич; Sciau, P.; Флёров, Игорь Николаевич
}
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10.


   
    Inversionless gain in a three-level system driven by a strong field and collisions / A. K. Popov [et al.] // Chin. Phys. - 2000. - Vol. 9, Is. 2. - P. 124-130. - Cited References: 45 . - ISSN 1009-1963
РУБ Physics, Multidisciplinary
Рубрики:
ELECTROMAGNETICALLY INDUCED TRANSPARENCY
   POPULATION-INVERSION
   LIGHT AMPLIFICATION
   QUANTUM COHERENCE
   REFRACTIVE-INDEX
   LASER
   INTERFERENCE
   TRANSITIONS
   SODIUM
   ATOMS
Аннотация: Inversionless gain in a degenerate three-level system driven by a strong external field and by collisions with a buffer gas is investigated. The mechanism of population distribution in upper laser level, contributed by the collision transfer, as well as by relaxation, induced by pressure of a buffer gas, is discussed in detail. Explicit formulae for analysis of optimal conditions are derived. The idea developed here for the incoherent pump could be generalized to other systems.

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Держатели документа:
Russian Acad Sci, Inst Phys, Krasnoyarsk, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660036, Russia
Jilin Univ, Dept Phys, Changchun 130023, Peoples R China
Univ Hannover, Inst Quantenopt, D-30167 Hannover, Germany
ИФ СО РАН

Доп.точки доступа:
Popov, A. K.; Myslivets, S. A.; Мысливец, Сергей Александрович; Gao, J. Y.; Zhang, H. Z.; Wellegehausen, B.
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