Spin susceptibility of charge-ordered YBa2Cu3Oy across the upper critical field

Rui Zhou, Michihiro Hirata, Tao Wu, Igor Vinograd, Hadrien Mayaffre, Steffen Krämer, Arneil P. Reyes, Philip L. Kuhns, Ruixing Liang, W. N. Hardy, D. A. Bonn, Marc Henri Julien

Research output: Contribution to journalArticlepeer-review

26 Citations (Scopus)


The value of the upper critical field Hc2, a fundamental characteristic of the superconducting state, has been subject to strong controversy in high-Tc copper oxides. Since the issue has been tackled almost exclusively by macroscopic techniques so far, there is a clear need for local-probe measurements. Here, we use17O NMR to measure the spin susceptibility χspin of the CuO2 planes at low temperature in charge-ordered YBa2Cu3Oy. We find that χspin increases (most likely linearly) with magnetic field H and saturates above field values ranging from 20 T to 40 T. This result is consistent with the lowest Hc2 values claimed previously and with the interpretation that the charge density wave (CDW) reduces Hc2 in underdoped YBa2Cu3Oy. Furthermore, the absence of marked deviation in χspin(H) at the onset of long-range CDW order indicates that this Hc2 reduction and the Fermi-surface reconstruction are primarily rooted in the short-range CDW order already present in zero field, not in the field-induced long-range CDW order. Above Hc2, the relatively low values of χspin at T = 2 K show that the pseudogap is a ground-state property, independent of the superconducting gap.

Original languageEnglish
Pages (from-to)13148-13153
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Issue number50
Publication statusPublished - 2017 Dec 12


  • High-temperature superconductors
  • Nuclear magnetic resonance
  • Pseudogap
  • Spin susceptibility
  • Upper critical field

ASJC Scopus subject areas

  • General


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