Magnetic properties of high-T[subscript c] superconductors

Abstract

32 2.3 Critical Fields Calculations from Various Models 35 High Field Limit (H = Hc2] 35 Intermediate Field Region (Hd « H « Hg2) 36 CHAPTER 3. EXPERIMENT 40 3.1. Sample Preparation 40 Grain Alignment of YBa2CugOy.g 41 Melt-textured YBa2Cu30y.g 44 3.2. Greiin Size Control in YBa2Cu30y_g 47 3.3. Magnetization Measurements 51 SQUID Magnetometer 51 iii Magnetization Measurements 54 3.4. Background Magnetization Subtraction 55 CHAPTER 4. RESULTS AND DISCUSSION 57 4.1. Thermodynamic Reversibility in the Fluctuation Regime Grain Aligned YBagCugOy.^ ' 57