Bulletin of the American Physical Society
2024 APS March Meeting
Monday–Friday, March 4–8, 2024; Minneapolis & Virtual
Session T16: Competing Orders in the Cuprate and Nickelate Superconductors
11:30 AM–1:54 PM,
Thursday, March 7, 2024
Room: M100G
Sponsoring
Unit:
DCMP
Chair: Benjamin Geisler, University of Florida
Abstract: T16.00007 : Resolving the Pseudogap in theYxP r1-xBa2Cu3O7-δ system.*
12:42 PM–12:54 PM
Presenter:
Francisco J Canales
(California State University of Los Angeles)
Authors:
Francisco J Canales
(California State University of Los Angeles)
Oscar Bernal
(California State University of Los Angeles)
Benjamin Begay
(California State University of Los Angeles)
Benjamin A Saack-LaVelle
(California State University of Los Angeles)
John Y Wei
(Univ of Toronto)
Armond Khodagulyan
(California State University of Los Angeles)
Christopher Orosco
(California State University of Los Angeles)
Chao C Zhang
(University of Toronto)
Synthesis of polycrystalline YxPr1−xBa2Cu3O7−δ(0 ≤ x ≤ 0.275, δ ≈ 0) samples has been achieved through solid state reaction. The samples are shown to be nearly single phase by XRD analysis. A recipe that had been used previously for making similar samples was found to yield large and inhomogeneous grain sizes. Improvements on the synthesis led to more homogeneous samples and smaller grain sizes. Samples prepared by both methods were subjected to resistance measurements within the temperature range of 20k and 300k. Samples where lead contacts showed signs of peeling off had relatively low signal to noise ratios with respect to samples for which the contacts were more robust. A linear fit method was used on the latter in order to detect deviations from linearity of resistance vs. temperature data in going from the normal to the superconducting state. Samples prepared using the old recipe did not yield detectable deviations. For the improved samples, the onset temperature of these deviations was marked as the Pseudogap Temperature (T*). The values of T* thus obtained are within the range that our collaborators have found in thin film samples with similar doping amounts. We present an updated phase diagram that includes our results.
*CSU-LSAMP is funded through the National Science Foundation (NSF) under grant #HRD-1826490 and the Chancellor's Office of the California State University.NSF-CREST Program at Cal State LA, award #EHR-1547723.Work supported by the NIH Bridges to the Ph.D. Program (LABB_PhD) at Cal State LA and by the NSERC Alliance International Catalyst Quantum Grant at Toronto.
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