Investigation of superconducting and non-superconducting phases of Na₀Ì£₃CoO₂·1.3H₂0
Author(s)Garcia, Daniel Robert, 1982-
Massachusetts Institute of Technology. Dept. of Physics.
Young S. Lee.
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The discovery of unconventional superconductivity in hydrated Na₀Ì£₃CoO₂·1.3H₂0 has lead to active research work on the material over the last year due to its similarities and possible insight into the high-T[sub]c copper oxide superconductors as well as the possibility of other rich physical phenomenon. In this thesis, experimental evidence is presented illustrating the existence and properties of a previously unknown non-superconducting phase of Na₀Ì£₃CoO₂·1.3H₂0. This evidence includes magnetic susceptibility and x-ray scattering studies which suggest that the appearance of this phase is not due to underhydration and that a superconducting state can be restored via annealing at temperatures above roughly 340 K. Furthermore, synchrotron x-ray scattering of the non-superconductor reveals a 3-c modulation which is clearly absent in the superconducting phase of the material as well as unexpected temperature dependence behavior in the associated Bragg peaks.
Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Physics, 2004.Includes bibliographical references (p. 40-41).
DepartmentMassachusetts Institute of Technology. Dept. of Physics.
Massachusetts Institute of Technology