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Observation Of Magnetic Moments In The Superconducting State Of Yba₂Cu₃O₆.₆, Herbert A. Mook, Pengcheng Dai, Fatih Dogan
Observation Of Magnetic Moments In The Superconducting State Of Yba₂Cu₃O₆.₆, Herbert A. Mook, Pengcheng Dai, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
Neutron scattering measurements for YBa2Cu3O6.6 have identified small magnetic moments that increase in strength as the temperature is reduced below T* and further increase below Tc. An analysis of the data shows the moments are antiferromagnetic between the Cu-O planes with a correlation length of longer than 195 Å in the a-b plane and about 35 Å along the c axis. The origin of the moments is unknown, and their properties are discusssed both in terms of Cu spin magnetism and orbital bond currents.
Evolution Of The Resonance And Incommensurate Spin Fluctuations In Superconducting Yba₂Cu₃O₆₊ₓ, Pengcheng Dai, Herbert A. Mook, Rodney Dale Hunt, Fatih Dogan
Evolution Of The Resonance And Incommensurate Spin Fluctuations In Superconducting Yba₂Cu₃O₆₊ₓ, Pengcheng Dai, Herbert A. Mook, Rodney Dale Hunt, Fatih Dogan
Materials Science and Engineering Faculty Research & Creative Works
Polarized and unpolarized neutron triple-axis spectrometry was used to study the dynamical magnetic susceptibility Χ″(q, ω) as a function of energy (ℏ ω) and wave vector (q) in a wide temperature range for the bilayer superconductor YBa2Cu3O6+x with oxygen concentrations, x, of 0.45, 0.5, 0.6, 0.7, 0.8, 0.93, and 0.95. The most prominent features in the magnetic spectra include a spin gap in the superconducting state, a pseudogap in the normal state, the much-discussed resonance, and incommensurate spin fluctuations below the resonance. We establish the doping dependence of the spin gap in the superconducting state, …