Перевод названия: КВАНТОВЫЕ ФАЗОВЫЕ ПЕРЕХОДЫ ЛИФШИЦА И ПЕРЕСТРОЙКА ФЕРМИ-ПОВЕРХНОСТИ С ИЗМЕНЕНИЕМ КОНЦЕНТРАЦИИ ДЫРОК В ВЫСОКОТЕМПЕРАТУРНЫХ СВЕРХПРОВОДНИКАХ
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.
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