Weak pseudogap in crystals of Pb2Sr2(Y,Ca)Cu3O8+d
Ya-Wei Hsueh, B.W. Statt, M. Reedyk, J.S. Xue, J.E. Greedan
TL;DR
This study reports on NMR measurements revealing a weak pseudogap in underdoped Pb2Sr2(Y,Ca)Cu3O8+d crystals, showing a lower temperature onset and similar effects on relaxation rates compared to other compounds.
Contribution
It provides new insights into the pseudogap behavior in Pb-based cuprates, highlighting differences from other underdoped high-temperature superconductors.
Findings
Weak pseudogap observed in Knight shift at lower temperatures
Pseudogap affects spin-lattice relaxation similarly to other compounds
Contrast between weak and strong pseudogap behaviors discussed
Abstract
We report on NMR measurements in underdoped Pb2Sr2(Y,Ca)Cu3O8+d crystals. A pseudogap is observed in the Knight shift and spin-lattice relaxation rate. In contrast to other underdoped compounds, the pseudogap observed in the Knight shift is weak and occurs at a significantly lower temperature. On the other hand, the effect the pseudogap has on spin-lattice relaxation is quite similar to that in other compounds. The contrast between weak and strong pseudogaps is discussed.
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