Revisiting Cu 63 NMR evidence for charge order in superconducting La1.885Sr0.115CuO4

T. Imai, S. K. Takahashi, A. Arsenault, A. W. Acton, D. Lee, W. He, Y. S. Lee, M. Fujita

Research output: Contribution to journalArticlepeer-review

19 Citations (Scopus)

Abstract

The presence of charge and spin stripe order in the La2CuO4-based family of superconductors continues to lead to new insight on the unusual ground-state properties of high-Tc cuprates. Soon after the discovery of charge stripe order at Tcharge≃65 K in Nd3+ co-doped La1.48Nd0.4Sr0.12CuO4(Tc≃6 K) [Tranquada, Nature (London) 375, 561 (1995)NATUAS0028-083610.1038/375561a0], Hunt et al. demonstrated that La1.48Nd0.4Sr0.12CuO4 and superconducting La2-xSrxCuO4 with x∼1/8(Tc≃30 K) share nearly identical NMR anomalies near Tcharge of the former [Phys. Rev. Lett. 82, 4300 (1999)PRLTAO0031-900710.1103/PhysRevLett.82.4300]. Their inevitable conclusion that La1.885Sr0.115CuO4 also undergoes charge order at a comparable temperature became controversial, because diffraction measurements at the time were unable to detect Bragg peaks associated with charge order. Recent advances in x-ray diffraction techniques finally led to definitive confirmations of the charge order Bragg peaks in La1.885Sr0.115CuO4 with an onset at as high as Tcharge≃80 K. Meanwhile, improved instrumental technology has enabled routine NMR measurements that were not feasible two decades ago. Motivated by these new developments, we revisit the charge order transition of a La1.885Sr0.115CuO4 single crystal based on Cu63 NMR techniques. We demonstrate that Cu63 NMR properties of the nuclear spin Iz=-12 to +12 central transition below Tcharge exhibit unprecedentedly strong dependence on the measurement time scale set by the separation time τ between the 90 and 180 radio-frequency pulses; a new kind of anomalous, very broad winglike Cu63 NMR signals gradually emerge below Tcharge only for extremely short τ 4μs, while the spectral weight INormal of the normal NMR signals is progressively wiped out. The NMR linewidth and relaxation rates depend strongly on τ below Tcharge, and their enhancement in the charge ordered state indicates that charge order turns on strong but inhomogeneous growth of Cu spin-spin correlations.

Original languageEnglish
Article number224508
JournalPhysical Review B
Volume96
Issue number22
DOIs
Publication statusPublished - 2017 Dec 26

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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