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Title: Revisiting Cu 63 NMR evidence for charge order in superconducting La 1.885 Sr 0.115 CuO 4

Here, the presence of charge and spin stripe order in the La 2CuO 4-based family of superconductors continues to lead to new insight on the unusual ground-state properties of high- T c cuprates. Soon after the discovery of charge stripe order at T charge≃65 K in Nd 3+ co-doped La 1.48Nd 0.4Sr 0.12CuO 4( Tc≃6 K), Hunt et al. demonstrated that La 1.48Nd 0.4Sr 0.12CuO 4 and superconducting La 2–xSr xCuO 4 with x~1/8( Tc≃30 K) share nearly identical NMR anomalies near Tcharge of the former. Their inevitable conclusion that La 1.885Sr 0.115CuO 4 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 La 1.885Sr 0.115CuO 4 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 La 1.885Sr 0.115CuO 4 single crystal based on 63Cu NMR techniques. We demonstrate that 63Cu NMR properties of the nuclearmore » spin I z=–1/2 to +1/2 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 63Cu NMR signals gradually emerge below Tcharge only for extremely short τ≲4μs, while the spectral weight I Normal 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.« less
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [4]
  1. McMaster Univ., Hamilton, ON (Canada); Canadian Institute for Advanced Research, Toronto, ON (Canada)
  2. McMaster Univ., Hamilton, ON (Canada)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States); Stanford Univ., Stanford, CA (United States)
  4. Tohoku Univ., Sendai (Japan)
Publication Date:
Grant/Contract Number:
FG02-07ER46134; AC02-76SF00515
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 22; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1420041

Imai, T., Takahashi, S. K., Arsenault, A., Acton, A. W., Lee, D., He, W., Lee, Y. S., and Fujita, M.. Revisiting Cu63 NMR evidence for charge order in superconducting La1.885Sr0.115CuO4. United States: N. p., Web. doi:10.1103/physrevb.96.224508.
Imai, T., Takahashi, S. K., Arsenault, A., Acton, A. W., Lee, D., He, W., Lee, Y. S., & Fujita, M.. Revisiting Cu63 NMR evidence for charge order in superconducting La1.885Sr0.115CuO4. United States. doi:10.1103/physrevb.96.224508.
Imai, T., Takahashi, S. K., Arsenault, A., Acton, A. W., Lee, D., He, W., Lee, Y. S., and Fujita, M.. 2017. "Revisiting Cu63 NMR evidence for charge order in superconducting La1.885Sr0.115CuO4". United States. doi:10.1103/physrevb.96.224508.
@article{osti_1420041,
title = {Revisiting Cu63 NMR evidence for charge order in superconducting La1.885Sr0.115CuO4},
author = {Imai, T. and Takahashi, S. K. and Arsenault, A. and Acton, A. W. and Lee, D. and He, W. and Lee, Y. S. and Fujita, M.},
abstractNote = {Here, 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), 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. 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 63Cu NMR techniques. We demonstrate that 63Cu NMR properties of the nuclear spin Iz=–1/2 to +1/2 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 63Cu 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.},
doi = {10.1103/physrevb.96.224508},
journal = {Physical Review B},
number = 22,
volume = 96,
place = {United States},
year = {2017},
month = {12}
}