Abstract
Abstract : This report documents the design and construction of a low temperature scanning tunneling microscope optimized for the study of superconductors. The microscope was first used to study the vortex liquid state in the cuprate high-Tc superconductor Bi2Sr2Cu06+x. This work distinguished between a homogenous superconducting gap and an additional inhomogenous 'pseudogap' which may be linked to an alternative electronic ordered state. The microscope then performed the first atomic resolution, high-field investigation of the new iron arsenic high-Tc superconductors. In particular, the vortex state was mapped in Ba(CoxFe1-x)2As2. Vortices formed a disordered lattice, uncorrelated with surface impurities, which demonstrated strong bulk pinning. Vortex core states were used to measure an electronic correlation length of 2.8 nanometers, from which an upper critical field of 43 Tesla was calculated.
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