Квантовые фазовые переходы и низкотемпературные свойства магнетиков с целым спином и большой одноионной анизотропией типа "легкая плоскость" тема диссертации и автореферата по ВАК РФ 01.04.02, кандидат физико-математических наук Сизанов, Алексей Владимирович

• Сизанов, Алексей Владимирович
• кандидат физико-математических наук
• 2012

Оглавление диссертации кандидат физико-математических наук Сизанов, Алексей Владимирович

Глава I Введение

1.1 Цель диссертационной работы.

1.2 Краткое содержание диссертации.

Глава II Техника и её применения при Т = О

2.1 Представление спиновых операторов

2.2 Применение техники.

2.2.1 Elementary excitation spectrum.

2.2.2 Энергия основного состояния

2.3 Обсуждение и сравнение с предыдущими результатами и экспериментом

2.3.1 Другие спиновые представления для S =

2.3.2 Другие подходы к вычислению спектра.

2.3.3 Сравнение с численными результатами

2.3.4 Применение к NiCl2-4SC(NH2)

Глава III Переход в упорядоченную фазу

3.1 Модификация техники в магнитном поле

3.2 Т = 0 and Н ф 0.

3.3 Тф 0 and Я ~ НС1 (0).

3.4 Применение к DTN.■

Глава IV Анализ скошенной антиферромагнитной фазы и окрестности поля насыщения при Т =

4.1 Спин-волновой анализ

4.2 Окрестность поля насыщения.:

4.3 Обсуждение и применение к DTN.

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