Type
Text
Type
Dissertation
Advisor
Dilip Gersappe | Tranquada, John M. | Guangyong Xu. | Gu, Genda
Date
2010-08-01
Keywords
magnetism, neutron scattering, superconductors | Physics, Condensed Matter
Department
Department of Materials Science and Engineering
Language
en_US
Source
This work is sponsored by the Stony Brook University Graduate School in compliance with the requirements for completion of degree.
Identifier
http://hdl.handle.net/11401/72705
Publisher
The Graduate School, Stony Brook University: Stony Brook, NY.
Format
application/pdf
Abstract
In this Dissertation, I combined neutron scattering with susceptibility, and transport measurements on two types of high-temperature superconductors La2-xBaxCuO4, and Fe1+yTe1-xSex to study theinterplay between magnetism and superconductivity. By studyingLa2-xBaxCuO4 with crystals grown by a floating-zone technique,it is found that static magnetic order competes with superconductivity,with the observation that both magnetic field and Znimpurity reduce the superconductivity and enhance the magneticorder. By studying the doping and magnetic-field dependence onFe1+yTe1-xSex with crystals grown by a horizontal unidirectionalsolidification method, it is revealed that magnetic fluctuations areessential for superconductivity. The results are consistent with theidea that magnetic excitations act as the"glue" to pair the electrons,and render the superconductivity.
Recommended Citation
Wen, Jinsheng, "Interplay between magnetism and superconductivity in high-temperature superconductors La(2−x)Ba(x)CuO(4) and Fe(1+y)Te(1−x)Se(x): crystal growth and neutron scattering studies" (2010). Stony Brook Theses and Dissertations Collection, 2006-2020 (closed to submissions). 1908.
https://commons.library.stonybrook.edu/stony-brook-theses-and-dissertations-collection/1908