Seniye KARAKAYA, Mustafa AKARSU, Senem AYDOĞU, Ömer ÖZBAŞ

YÜKSEK SICAKLIK SÜPERİLETKENLERİNDE VORTEX BÖLGESİNİN ÖZELLİKLERİ

Bu çalışma, yüksek sıcaklık süperiletkenlerindeki vortex örgü erimesi sebebiyle vortex sıvının oluşumunu ve davranışını özetler. Süperiletkenliğin mikroskobik teorisi ve I. tip ve II. tip süperiletkenlerin manyetik özelliklerinin anlaşılması için gerekli temel kavramlar kısaca tartışıldı. Süperiletkenlerin manyetik durumları ifade edildi ve manyetik faz diyagramları gösterildi. Yüksek sıcaklık süperiletkenleri için vortex katıdan vortex sıvı faza geçiş ifade edilmektedir. Bu iki faz arasındaki geçişin özelliği olan vortexlerin vortex sütunlarındaki bozulma, güçlü termal dalgalanmalar ve nokta kusurlar araştırıldı. Aynı zamanda , süperiletken tabakalara paralel olarak uygulanan yüksek manyetik alanların vortex katı-sıvı geçişi üzerine etkileri tartışıldı.

Anahtar Kelimeler:

Süperiletkenlik, Vortex durum, Vortex sıvı, Abrikosov vortex

PROPERTIES OF VORTEX STATES IN HIGH TEMPERATURE SUPERCONDUCTORS

This paper reviews vortex behavior and formation of vortex liquid due to vortex lattice melting in high temperature superconductors (HTSC). The microscopic theory of superconductivity and the basic concepts needed to understand the magnetic properties of type I and type II superconductors are discussed briefly. Magnetic states of superconductors are described and magnetic phase diagrams are presented. The transition from the vortex solid to the vortex liquid phase for HTSC is described. Effects of the point, columnar disorders and strong thermal fluctuations on the character of the transition between these two phases are studied. The effects on the vortex solid to liquid transition of high magnetic fields applied parallel to the superconducting layers are also studied.

Keywords:

Superconductivity, Vortex state, Vortex liquid, Abrikosov vortex,

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