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1.
Two-phase paramagnetic-ferromagnetic state
of La0.7Pb0.3MnO3 single-crystal lanthanum manganite / N. V. Volkov [et al.]> // Phys. Solid State. - 2002. -
Vol. 44
,
Is. 7
. - P. 1350-1354,
DOI
10.1134/1.1494635. - Cited References: 17 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
COLOSSAL MAGNETORESISTANCE
MAGNETIC
-
RESONANCE
DOPED MANGANITES
LA1-XCAXMNO3
SEPARATION
TRANSITION
RELAXATION
EPR
Аннотация:
Two phases, paramagnetic and ferromagnetic, were shown by the
magnetic
resonance
method to coexist below the temperature T-C in La0.7Pb0.3MnO3 single crystals exhibiting colossal magnetoresistance. The
magnetic
resonance
spectra were studied in the frequency range 10-78 GHz. The specific features in the behavior of the spectral parameters were observed to be the strongest at the temperatures corresponding to the maximum magnetoresistance in the crystals. The concentration ratios of the paramagnetic and ferromagnetic phases in the samples were found to be sensitive to variations in temperature and external
magnetic
field. This behavior suggests realization of the electronic phase separation mechanism in the system under study. (C) 2002 MAIK "Nauka/Interperiodica".
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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Div, Krasnoyarsk 660036, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Volkov, N. V.; Волков, Никита Валентинович; Petrakovskii, G. A.; Петраковский, Герман Антонович; Vasil'ev, V. N.; Sablina, K. A.; Саблина, Клара Александровна
}
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2.
Rhodium(III) speciation in
concentrated nitric acid solutions / D. Vasilchenko [et al.]> // Eur. J. Inorg. Chem. - 2016. -
Vol. 2016
,
Is. 23
. - P. 3822-3828,
DOI
10.1002/ejic.201600523. - Cited References:31. - This work was supported by the Russian Foundation for Basic Research (grant number 16-03-00549 A). D. V. thanks the Ministry for Education and Science of the Russian Federation for the award of a President of the Russian Federation for Young Scientists Fellowship. . - ISSN 1434-1948. - ISSN 1099-0682
РУБ
Chemistry, Inorganic & Nuclear
Рубрики:
MAGNETIC
-
RESONANCE
FISSION PLATINOIDS
AQUEOUS-SOLUTIONS
PT-195 NMR
RH(III)
SPECTROSCOPY
CHEMISTRY
DISSOCIATION
PLATINUM(IV)
COMPLEXES
Кл.слова (ненормированные):
Rhodium
--
NMR spectroscopy
--
Nitrates
Аннотация:
The interaction of rhodium(III) aqua ions with nitrate ions in 3–16 m nitric acid solutions has been studied by 103Rh and 15N NMR and Raman spectroscopy. The mononuclear complexes [Rh(H2O)6–n(NO3)n]3–n (n = 1–4) were found to be the only form of rhodium(III) existing in the solutions with the metal concentration in the range 0.2–1.3 m. The dynamics of the H2O → NO3– substitution process was studied at 80 °C. An increase in the average number of nitrate groups bonded to rhodium with increasing concentration of nitric acid was also determined. The fine crystalline salt Rb4trans-[Rh(H2O)2(NO3)4][Rh(NO3)6] was obtained by solvothermal concentration of the rhodium nitric acid solution on addition of rubidium nitrate. The structure of the salt was solved by the powder X-ray diffraction method, with monodentate coordination of nitrato ligands found for both the [Rh(NO3)6]3– and trans-[Rh(H2O)2(NO3)4]– anions.
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Держатели документа:
Russian Acad Sci, Nikolaev Inst Inorgan Chem, Siberian Branch, Novosibirsk 630090, Russia.
Novosibirsk State Univ, Novosibirsk 630090, Russia.
RAS, Inst Chem & Chem Technol, SB, Krasnoyarsk 660049, Russia.
RAS, Kirensky Inst Phys, SB, Krasnoyarsk 660036, Russia.
Siberian Fed Univ, 79 Svobodny Pr, Krasnoyarsk 660041, Russia.
Доп.точки доступа:
Vasilchenko, D.; Vorob'eva, S.; Tkachev, S.; Baidina, I. A.; Belyaev, A.; Korenev, S.; Solovyov, L.; Vasiliev, A. D.; Васильев, Александр Дмитриевич; Russian Foundation for Basic Research [16-03-00549 A]; Ministry for Education and Science of the Russian Federation
}
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3.
Zobov, V. E.
On time-optimal NMR control of states of qutrits represented by quadrupole nuclei with the spin I=1 / V. E. Zobov, V. P. Shauro> // J. Exp. Theor. Phys. - 2011. -
Vol. 113
,
Is. 2
. - P. 181-191,
DOI
10.1134/S1063776111060094. - Cited References: 48. - This work was supported by the Russian Foundation for Basic Research (project no. 09-07-00138) and the Dynasty Foundation. . - ISSN 1063-7761
РУБ
Physics, Multidisciplinary
Рубрики:
QUANTUM COMPUTATION
MAGNETIC
-
RESONANCE
ALGORITHMS
ELEMENTS
PULSES
DESIGN
QUDITS
GATES
Кл.слова (ненормированные):
Logical operators
--
Nuclear spins
--
Numerical optimizations
--
Optimality
--
Physical parameters
--
Quadrupole nuclei
--
Qutrits
--
Radio frequencies
--
RF pulse
--
Three level systems
--
Time dependence
--
Time-optimal
--
Computer control systems
--
Computer simulation
--
Fourier transforms
--
Optimization
--
Quantum computers
--
Resonance
--
Nuclear quadrupole
resonance
Аннотация:
Elementary logical operators (selective rotation, Fourier transform, controllable phase shift, and SUM gate) are considered for a quantum computer based on three-level systems (qutrits) represented by nuclear spins I = 1 under nuclear
magnetic
resonance
conditions. The computer simulation of the realization of these operators by means of simple and composite selective radiofrequency (RF) pulses and optimized RF pulses is performed. The time dependence of the amplitude of last pulses is found by numerical optimization at different durations. Two variants are proposed for realization of a two-qutrit SUM gate by using one-qutrit or two-qutrit optimized RF pulses. The calculated time dependences of realization errors were used to study the time optimality of different methods for obtaining gates, proposed earlier and in this paper. The advantages and disadvantages of each of the methods are evaluated for different values of physical parameters.
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Держатели документа:
[Zobov, V. E.
Shauro, V. P.] Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН
L.V. Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation
Доп.точки доступа:
Shauro, V. P.; Шауро, Виталий Павлович; Зобов, Владимир Евгеньевич
}
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4.
H-2 NMR investigation
of the transition to the proton glass state in the CS5H3(SO4)(4)center dot 0.5H(2)O crystal / Y. N. Ivanov [et al.]> // Phys. Solid State. - 2007. -
Vol. 49
,
Is. 6
. - P. 1142-1148,
DOI
10.1134/S1063783407060200. - Cited References: 19 . - ISSN 1063-7834
РУБ
Physics, Condensed Matter
Рубрики:
DIELECTRIC-RELAXATION
MAGNETIC
-
RESONANCE
PHASES
Аннотация:
A crystal of the CS5H3(SO4)(4) (.) xH(2)O (x approximate to 0.5) (PCHS) compound, which belongs to the family of proton conductors with a complex system of hydrogen bonds, is investigated by H-2 NMR spectroscopy. The temperature and orientation dependences of the H-2 NMR spectra are measured and analyzed. It is established that, upon transition to the glassy phase at the temperature T-g = 260 K, the parameters characterizing the proton exchange between positions in hydrogen bonds remain unchanged to within the limits of experimental error. The protons in the two-dimensional network of hydrogen bonds in the (001) plane are dynamically disordered over possible positions down to temperatures considerably lower than the glass transition point T-g. However, water molecules are fixed at particular structural positions in the phase transition range. In PCHS crystals with a nonstoichiometric water content, this circumstance can be responsible for the frustration that leads to the formation of the glassy state.
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Держатели документа:
LV Kirenskii Inst Phys, Russian Acad Sci, Siberian Div, Krasnoyarsk 660036, Russia
Russian Acad Sci, Shubnikov Inst Crystallog, Moscow 119333, Russia
ИФ СО РАН
Kirensky Institute of Physics, Siberian Division, Russian Academy of Sciences, Akademgorodok, Krasnoyarsk 660036, Russian Federation
Shubnikov Institute of Crystallography, Russian Academy of Sciences, Leninskii pr. 59, Moscow 119333, Russian Federation
Доп.точки доступа:
Ivanov, Y. N.; Иванов, Юрий Николаевич; Aleksandrova, I. P.; Александрова, Инга Петровна; Sukhovsky, A. A.; Суховский, Андрей Андреевич; Baranov, A. I.
}
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