Bulletin of the American Physical Society
APS March Meeting 2024
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session K16: Spin-Sensitive Experiments on Singlet and Triplet Superconductors
3:00 PM–5:12 PM,
Tuesday, March 5, 2024
Room: M100G
Sponsoring
Unit:
DCMP
Chair: Raphael Hermann, Oak Ridge National Laboratory
Abstract: K16.00001 : Cuprate universal electronic spin response and the pseudogap from NMR*
3:00 PM–3:12 PM
Presenter:
Daniel Bandur
(Leipzig University)
Author:
Daniel Bandur
(Leipzig University)
For overdoped metallic samples, both become temperature dependent only at the critical temperature of superconductivity, $T_mathrm{c}$, where both begin to decrease. However, the Cu spin component turns increasingly negative until the second spin has disappeared. In the presence of a small pseudogap the onset temperature of this process coincides with the onset of the temperature dependence of the shifts, which is now above $T_mathrm{c}$. As the pseudogap increases further, the behavior does not change even as $T_mathrm{c}$ begins to decrease again. The temperature independent constant in the linear relationship describing the negative spin is related to the size of the uncoupled spin components and depends on the planar oxygen hole content that is known to correlate with the maximum $T_mathrm{c}$. The Cu spin component does not appear to carry significant entropy as the nuclear relaxation ceases in the condensed state.
*Leipzig University
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