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Ovchinnikov, S. G.
From underdoped to overdoped cuprates: two quantum phase transitions / S. G. Ovchinnikov, E. I. Shneyder, M. M. Korshunov // J. Phys.: Condens. Matter. - 2011. - Vol. 23, Is. 4. - Ст. 45701, DOI 10.1088/0953-8984/23/4/045701. - Cited References: 58. - We would like to thank S Sakai for useful discussions. The authors acknowledge support by the Russian Foundation for Basic Research (grant N 09-02-00127), by the Integration Program of SBRAS N40, the Presidium RAS Program 5.7, President of Russia (grant MK-1683.2010.2), FCP Scientific and Research-and-Educational Personnel of Innovative Russia for 2009-2013 (GK P891), and in part by the National Science Foundation under grant NSF PHY05-51164. . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   T-J MODEL
   CORRELATED FERMION SYSTEMS
   VALENCE BOND STATE
   MEAN-FIELD-THEORY
   CRITICAL-POINT
   HEISENBERG-ANTIFERROMAGNET
   EXCITATIONS
   PSEUDOGAP
   OSCILLATIONS
Кл.слова (ненормированные):
Critical concentration -- Critical points -- Cuprates -- Density of state -- Fermi surface topology -- Hall effect measurement -- High-T -- Optimal doping -- Overdoped -- Pseudo-gap -- Quantum phase transitions -- Theoretical study -- Copper compounds -- Hall effect -- Magnetic field effects -- Phase diagrams -- Phase transitions
Аннотация: Several experimental and theoretical studies indicate the existence of a critical point separating the underdoped and overdoped regions of the high-T-c cuprates' phase diagram. There are at least two distinct proposals on the critical concentration and its physical origin. The first one is associated with the pseudogap formation for p < p*, with p* approximate to 0.2. The other relies on the Hall effect measurements and suggests that the critical point and the quantum phase transition (QPT) take place at optimal doping, p(opt) approximate to 0.16. Here we have performed a precise density of states calculation and found that there are two QPTs and the corresponding critical concentrations associated with the change of the Fermi surface topology upon doping.

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Держатели документа:
[Ovchinnikov, S. G.
Shneyder, E. I.
Korshunov, M. M.] Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
[Ovchinnikov, S. G.] Siberian Fed Univ, Krasnoyarsk 660041, Russia
[Shneyder, E. I.] Reshetnev Siberian State Aerosp Univ, Krasnoyarsk 660014, Russia
[Korshunov, M. M.] Univ Florida, Dept Phys, Gainesville, FL 32611 USA
ИФ СО РАН
L V Kirensky Institute of Physics, Siberian Branch, Russian Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Siberian Federal University, Krasnoyarsk 660041, Russian Federation
Reshetnev Siberian State Aerospace University, Krasnoyarsk 660014, Russian Federation
Department of Physics, University of Florida, Gainesville, FL 32611, United States

Доп.точки доступа:
Shneyder, E. I.; Шнейдер, Елена Игоревна; Korshunov, M. M.; Коршунов, Максим Михайлович; Овчинников, Сергей Геннадьевич
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Sadreev, A. F.
Electron transmission through an ac biased quantum point contact / A. F. Sadreev, K. . Davlet-Kildeev // Phys. Rev. B. - 2007. - Vol. 75, Is. 23. - Ст. 235309, DOI 10.1103/PhysRevB.75.235309. - Cited References: 41 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
MULTIPROBE CONDUCTORS
   BALLISTIC TRANSPORT
   WIRES
   GAS
   CONSTRICTION
   SCATTERING
   TIME
   QUANTIZATION
   OSCILLATIONS
   RESISTANCE
Аннотация: We consider a transmission through the potential relief created by a split gate constriction (quantum point contact). Simultaneously, dc and ac voltages V-up(t)=V-0+V-1 cos omega t and V-dw(t)=V-0+V-1 cos(omega t+theta) are applied to the gates. We show numerically that the in-phase ac voltages (theta=0) smear the conductance steps of the stationary conductance, while the antiphase ac voltages (theta=pi) only shift the conductance steps. Moreover, computation of currents in probing wires connected cross to the time-periodic quantum point contact reveals a net current for theta not equal 0,pi. This implies that the Schrodinger equation described by the electron transport under the effect of the time-periodic long electrodes is equivalent to the transmission in the crossed effective magnetic and electric fields, where the in-plane magnetic field b similar to theta is directed along the transport axis and the electric field e similar to omega is directed perpendicular to the plane of electron transport. Then the vector exb gives rise to the galvanomagnetic current directed cross to the electron transport.

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Держатели документа:
Russian Acad Sci, Inst Phys, Krasnoyarsk 660036, Russia
Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden
ИФ СО РАН
Institute of Physics, Academy of Sciences, 660036 Krasnoyarsk, Russian Federation
Department of Physics and Measurement Technology, Linkoping University, S-581 83 Linkoping, Sweden

Доп.точки доступа:
Davlet-Kildeev, K.; Садреев, Алмаз Фаттахович
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Stress and growth of Ag monolayers on a Fe(100) whisker / R. . Mahesh [et al.] // Phys. Rev. B. - 2003. - Vol. 68, Is. 4. - Ст. 45416, DOI 10.1103/PhysRevB.68.045416. - Cited References: 42 . - ISSN 1098-0121

РУБ Physics, Condensed Matter
Рубрики:
FCC-FE FILMS
   MAGNETIC SUPERLATTICES
   ULTRATHIN FILMS
   OSCILLATIONS
   CU(100)
   SANDWICHES
   INTERLAYER
   LAYERS
   MAGNETORESISTANCE
   INTERFACE
Аннотация: In situ stress measurements have been performed during the deposition of epitaxial Ag monolayers on a Fe whisker. A compressive stress of -0.6 GPa is measured above a 5-ML Ag thickness which is ascribed to the epitaxial misfit of -0.8% between Ag and Fe. Back-extrapolation of the coverage dependent stress measurements to zero coverage reveals an Ag-induced change of the surface stress of Fe(100) of -1.23 N/m. Comparing this surface stress change with the calculated surface stress for Ag(100) suggests a tensile surface stress of +2.05 N/m for clean Fe(100). The deposition of 2 - 5 layers of Ag does not change the stress induced by the first layer significantly. This almost stress free growth is assigned to a rougher surface morphology which is most likely caused by a surface alloy formation.

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Держатели документа:
Max Planck Inst Mikrostrukturphys, D-06120 Halle Saale, Germany
Russian Acad Sci, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Mahesh, R.; Sander, D.; Zharkov, S. M.; Жарков, Сергей Михайлович; Kirschner, J.
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Fransson, J.
Many-body approach to spin-dependent transport in quantum dot systems / J. . Fransson, O. . Eriksson, I. . Sandalov // Phys. Rev. Lett. - 2002. - Vol. 88, Is. 22. - Ст. 226601, DOI 10.1103/PhysRevLett.88.226601. - Cited References: 37 . - ISSN 0031-9007

РУБ Physics, Multidisciplinary
Рубрики:
SINGLE-ELECTRON TRANSISTOR
   COULOMB-BLOCKADE
   ANDERSON IMPURITY
   ROOM-TEMPERATURE
   TUNNEL-JUNCTIONS
   EVEN NUMBER
   MODEL
   MAGNETORESISTANCE
   OSCILLATIONS
   CONDUCTANCE
Аннотация: By means of a diagram technique for Hubbard operators, we show the existence of a spin-dependent renormalization of the localized levels in an interacting region, e.g., quantum dot, modeled by the Anderson Hamiltonian with two conduction bands. It is shown that the renormalization of the levels with a given spin direction is due to kinematic interactions with the conduction subbands of the opposite spin. The consequence of this dressing of the localized levels is a drastically decreased tunneling current for ferromagnetically ordered leads compared to that of paramagnetically ordered leads. Furthermore, the studied system shows a spin-dependent resonant tunneling behavior for ferromagnetically ordered leads.

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Держатели документа:
Univ Uppsala, Condensed Matter Theory Grp, S-75121 Uppsala, Sweden
RAS, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Eriksson, O.; Sandalov, I.
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Val'kov, V. V.
Quantum temperature fluctuations in the magnetization of antiferromagnetic semimetals / V. V. Val'kov, D. M. Dzebisashvili // Phys. Solid State. - 1998. - Vol. 40, Is. 9. - P. 1523-1529, DOI 10.1134/1.1130591. - Cited References: 19 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
FERMI-SURFACE
   OSCILLATIONS
   SUPERCONDUCTOR
   CEAS
Аннотация: It is shown that in semimetallic, low-temperature antiferromagnetic materials located in a quantizing magnetic field, the part of the band magnetization M similar to which oscillates in H can have a nonmonotonic temperature dependence. This non-Fermi liquid behavior will show up experimentally in the form of quantum temperature fluctuations of the magnetization when the decrease with rising temperature is oscillatory, rather than the usual monotonic decrease. It is shown that the magnetization from an individual spin electron (or hole) subband has the form of weakly damped periodic oscillations as a function of T-2. This result makes it possible to develop an efficient method for studying the electronic structure of antiferromagnetic semimetals based on an examination of the quantum temperature fluctuations. Calculations show that quantum temperature fluctuations can be observed, for example, in the cerium monopnictides CeP and CeAs, which are strongly correlated, antiferromagnetic, compensated semimetals with low Neel temperatures. (C) 1998 American Institute of Physics. [S1063-7834(98)02409-5].

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
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Alekseev, K. N.
Strange attractor in resonant tunneling / K. N. Alekseev, G. P. Berman, D. K. Campbell // Phys. Rev. B. - 1998. - Vol. 58, Is. 7. - P. 3954-3962, DOI 10.1103/PhysRevB.58.3954. - Cited References: 38 . - ISSN 0163-1829

РУБ Physics, Condensed Matter
Рубрики:
INTRINSIC BISTABILITY
   RING CAVITY
   OPTICAL TURBULENCE
   TRANSMITTED LIGHT
   QUANTUM-WELLS
   OSCILLATIONS
   BARRIERS
   SYSTEM
   STATE
   TIME
Аннотация: We consider the process of resonant electron tunneling through a double-barrier potential, taking into account nonlinear dynamical effects generated by charge accumulation in the interbarrier space. We use the perturbation approach of Davydov and Ermakov, which was developed for investigating intrinsic bistability in resonant tunneling. For incoming electron flow, which is modulated slowly in time, we show that the resulting nonlinear dynamics can become chaotic, with the chaos described (because of the open nature of the system) by a strange attractor. We determine the conditions for the existence of this strange attractor and estimate characteristic experimental parameters for its observation.

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Держатели документа:
LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Univ Calif Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
Univ Calif Los Alamos Natl Lab, CNLS, Los Alamos, NM 87545 USA
Univ Illinois, Dept Phys, Urbana, IL 61801 USA
ИФ СО РАН

Доп.точки доступа:
Berman, G. P.; Campbell, D. K.
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Val'kov, V. V.
Magnetopolaron states of a spin-correlated antiferromagnet in the neighborhood of the spin-glass transition / V. V. Val'kov, D. M. Dzebisashvili // Phys. Solid State. - 1998. - Vol. 40, Is. 2. - P. 282-286, DOI 10.1134/1.1130293. - Cited References: 20 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
OSCILLATIONS
CEAS
Аннотация: The problem of the spectrum of magnetopolaron states of a strongly correlated conducting canted antiferromagnet is solved. The approach used to study the spectrum is based on an atomic representation and a diagram technique for Hubbard operators. This approach makes it possible to include strong intra-ion interactions in a first-principles way, and to obtain the dispersion equation for the magnetopolaron spectrum for arbitrary values of the magnitude of the spin, temperature, and magnetic field. In the vicinity of the spin-flip transition an analytic expression is obtained for the spectrum of magnetopolaron states that goes beyond the framework of the quasiclassical approximation. (C) 1998 American Institute of Physics.

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Держатели документа:
Russian Acad Sci, Siberian Branch, LV Kirensky Phys Inst, Krasnoyarsk 660036, Russia
Krasnoyarsk State Univ, Krasnoyarsk 660000, Russia
Krasnoyarsk State Tech Univ, Krasnoyarsk 660036, Russia
ИФ СО РАН

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Вальков, Валерий Владимирович
}
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Valkov, V. V.
Influence of antiferromagnetic ordering on the de Haas-van Alphen effect in a semimetal / V. V. Valkov, D. M. Dzebisashvili // Phys. Solid State. - 1997. - Vol. 39, Is. 2. - P. 179-184, DOI 10.1134/1.1129779. - Cited References: 19 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
HIGH-TEMPERATURE SUPERCONDUCTORS
   NORMAL STATE
   OSCILLATIONS
   CEAS
Аннотация: The distinctive characteristics of the de Haas-van Alphen effect in semimetals with antiferromagnetic long-range order are investigated theoretically. It is shown that the transition of the subsystem of localized spins from the canted antiferromagnetic phase to the ferromagnetic phase is accompanied by an abrupt change in the ''frequency'' of the magnetization oscillations of band carriers M-similar to. In the below-critical range of magnetic fields, M-similar to is not a function periodic in 1/H. Significantly, the additional contribution to the phase of the oscillatory factors is proportional to H-2 and is determined entirely by quantum fluctuations in the antiferromagnetic subsystem. (C) 1997 American Institute of Physics.

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Держатели документа:
L.V. Kirenskii Inst. of Phys., Siberian Br. Russ. Acad. of Sci., 660036 Krasnoyarsk, Russian Federation
ИФ СО РАН

Доп.точки доступа:
Dzebisashvili, D. M.; Дзебисашвили, Дмитрий Михайлович; Val'kov, V. V.
}
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Drokin, N. A.
Static and dynamic characteristics of the bulk and contact electric resistivity in CDCR2SE4 under stochastic current instability / N. A. Drokin, S. M. Ganiev // Fiz. Tverd. Tela. - 1992. - Vol. 34, Is. 7. - P. 2122-2128. - Cited References: 21 . - ISSN 0367-3294

РУБ Physics, Condensed Matter
Рубрики:
OSCILLATIONS
CHAOS
GE

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Доп.точки доступа:
Ganiev, S. M.; Дрокин, Николай Александрович
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