Lifshits Quantum Phase Transitions and Rearrangement of the Fermi Surface upon a Change in the Hole Concentration in High-Temperature Superconductors

Описание

Тип публикации: статья из журнала

Год издания: 2009

Идентификатор DOI: 10.1134/S1063776109110077

Ключевые слова: Critical points, Cuprates, Electron heat, Electron structures, Experimental data, High-T, Layered cuprates, Low temperatures, Normal phase, Quantum oscillations, Quantum phase transitions, Sign reversal, Strong correlation, Copper compounds, Electronic structure, Equations of state, Fermi surface, Fermions, High temperature superconductors, Hole concentration, Superconductivity, Surface structure, Phase transitions

Аннотация: Changes in the electronic structure in the normal phase of high-T-c superconductors (HTSCs), viz., layered cuprates, are considered. The results of LDA + GTB calculations of the electron structure and the Fermi surface of La2-xSrxCuO4 one-layer cuprates with allowance for strong correlations are compared with ARPES and quantum osciПоказать полностьюllations data. Two critical points x(c1) and x(c2) are discovered at which the rearrangement of the Fermi surface takes place. In the vicinity of these points, changes in the thermodynamic properties at low temperatures are determined using the Lifshits ideology concerning 2.5-order quantum phase transitions. A singularity delta(C/T) proportional to (x-x(e))(1/2) in the electron heat capacity agrees well with the available experimental data in the vicinity of x(c1)approximate to 0.15. Sign reversal of the Hall constant upon doping is also considered qualitatively.

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Издание

Журнал: JOURNAL OF EXPERIMENTAL AND THEORETICAL PHYSICS

Выпуск журнала: Vol. 109, Is. 5

Номера страниц: 775-785

ISSN журнала: 10637761

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Ovchinnikov S.G. (Reshetnikov Siberian State Aerospace University)
  • Korshunov M.M. (Department of Physics,University of Florida)
  • Shneyder E.I. (Reshetnikov Siberian State Aerospace University)

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