4.6 Article

Competition between spin ordering and superconductivity near the pseudogap boundary in La2-xSrxCuO4: Insights from NMR

Journal

PHYSICAL REVIEW B
Volume 106, Issue 5, Pages -

Publisher

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.054522

Keywords

-

Funding

  1. Laboratoire d'Excellence LANEF [ANR- 10-LABX-51-01]
  2. French Agence Nationale de la Recherche (ANR) [ANR-19- CE30-0019]
  3. US National Science Foundation [DMR-1644779]
  4. State of Florida
  5. Swiss National Science Foundation

Ask authors/readers for more resources

This study examines the characteristics of the magnetic ground state under high magnetic fields in La2-xSrxCuO4 through NMR measurements and quantitative analysis, explaining the effects of the magnetic field on magnetic transitions, as well as the changes in spin fluctuations near the onset of static charge order.
When superconductivity is suppressed by high magnetic fields in La2-xSrxCuO4, striped antiferromagnetic (AFM) order becomes the magnetic ground state of the entire pseudogap regime, up to its end at the doping p* [Frachet, Vinograd et al., Nat. Phys. 16, 1064 (2020)]. Glass-like freezing of this state is detected in La-139 NMR measurements of the spin-lattice relaxation rate T-1(-1). Here, we present a quantitative analysis of T-1(-1 ) data in the hole-doping range p = x = 0.12 - 0.171, based on the Bloembergen-Purcell-Pound (BPP) theory, modified to include statistical distribution of parameters arising from strong spatial inhomogeneity. We observe spin fluctuations to slow down at temperatures T near the onset of static charge order and, overall, the effect of the field B may be seen as equivalent to strengthening stripe order by approaching p = 0.12 doping. In details, however, our analysis reveals significant departure from usual field-induced magnetic transitions. The continuous growth of the amplitude of the fluctuating moment with increasing B suggests a nearly-critical state in the B -> 0 limit, with very weak quasistatic moments possibly confined in small areas like vortex cores. Further, the nucleation of spin order in the vortex cores is shown to account quantitatively for both the value and the p dependence of a field scale characterizing bulk spin freezing. The correlation time of the fluctuating moment appears to depend exponentially on B/T (over the investigated range). This explains the timescale dependence of various experimental manifestations, including why, for transport measurements, the AFM moments may be considered static over a considerable range of B and T. These results make the high-field magnetic ground state up to p* an integral part of the discussion on putative quantum criticality.

Authors

I am an author on this paper
Click your name to claim this paper and add it to your profile.

Reviews

Primary Rating

4.6
Not enough ratings

Secondary Ratings

Novelty
-
Significance
-
Scientific rigor
-
Rate this paper

Recommended

No Data Available
No Data Available