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Title: La 139 NMR investigation of the charge and spin order in a La 1.885 Sr 0.115 CuO 4 single crystal

Abstract

139La NMR is suited for investigations into magnetic properties of La2CuO4 -based cuprates in the vicinity of their magnetic instabilities, owing to the modest hyperfine interactions between 139La nuclear spins and Cu electron spins. We report comprehensive 139La NMR measurements on a single-crystal sample of high-Tc superconductor La 1.885 Sr 0.115 CuO4 in a broad temperature range across the charge and spin order transitions (T charge ≃ 80 K, T neutron spin ≃ Tc = 30 K). From the high-precision measurements of the linewidth for the nuclear spin Iz = + 1 / 2 to -1/2 central transition, we show that paramagnetic line broadening sets in precisely at T charge due to enhanced spin correlations within the CuO2 planes. Additional paramagnetic line broadening ensues below ~35 K, signaling that Cu spins in some segments of CuO2 planes are on the verge of three-dimensional magnetic order. A static hyperfine magnetic field arising from ordered Cu moments along the ab plane, however, begins to develop only below T$$μSR\atop{spin}$$ = 15 – 20 K, where earlier muon spin rotation measurements detected Larmor precession for a small volume fraction (~20 % ) of the sample. Based on the measurement of 139 La nuclear-spin-lattice relaxation rate 1/T1, we also show that charge order triggers enhancement of low-frequency Cu spin fluctuations inhomogeneously; a growing fraction of 139 La sites is affected by enhanced low-frequency spin fluctuations toward the eventual magnetic order, whereas a diminishing fraction continues to exhibit a behavior analogous to the optimally superconducting phase even below Tcharge. In conclusion, these 139La NMR results corroborate our recent 63Cu NMR observation that a very broad, anomalous winglike signal gradually emerges below Tcharge, whereas the normally behaving, narrower main peak is gradually wiped out [T. Imai et al., Phys. Rev. B 96, 224508 (2017)]. Furthermore, we show that the enhancement of low-energy spin excitations in the low-temperature regime below Tneutron spin (≃ Tc) depends strongly on the magnitude and orientation of the applied magnetic field.

Authors:
 [1];  [1];  [2];  [3];  [3];  [4]
  1. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy
  2. McMaster Univ., Hamilton, ON (Canada). Dept. of Physics and Astronomy; Canadian Inst. for Advanced Research, Toronto, ON (Canada)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Dept. of Applied Physics
  4. Tohoku Univ., Sendai (Japan). Inst. for Materials Research
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Grant-in-Aid for Scientific Research, Japan
OSTI Identifier:
1423541
Alternate Identifier(s):
OSTI ID: 1420490
Grant/Contract Number:  
AC02-76SF00515; 16H02125
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 97; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Arsenault, A., Takahashi, S. K., Imai, T., He, W., Lee, Y. S., and Fujita, M. La139 NMR investigation of the charge and spin order in a La1.885Sr0.115CuO4 single crystal. United States: N. p., 2018. Web. doi:10.1103/physrevb.97.064511.
Arsenault, A., Takahashi, S. K., Imai, T., He, W., Lee, Y. S., & Fujita, M. La139 NMR investigation of the charge and spin order in a La1.885Sr0.115CuO4 single crystal. United States. doi:10.1103/physrevb.97.064511.
Arsenault, A., Takahashi, S. K., Imai, T., He, W., Lee, Y. S., and Fujita, M. Wed . "La139 NMR investigation of the charge and spin order in a La1.885Sr0.115CuO4 single crystal". United States. doi:10.1103/physrevb.97.064511. https://www.osti.gov/servlets/purl/1423541.
@article{osti_1423541,
title = {La139 NMR investigation of the charge and spin order in a La1.885Sr0.115CuO4 single crystal},
author = {Arsenault, A. and Takahashi, S. K. and Imai, T. and He, W. and Lee, Y. S. and Fujita, M.},
abstractNote = {139La NMR is suited for investigations into magnetic properties of La2CuO4 -based cuprates in the vicinity of their magnetic instabilities, owing to the modest hyperfine interactions between 139La nuclear spins and Cu electron spins. We report comprehensive 139La NMR measurements on a single-crystal sample of high-Tc superconductor La 1.885 Sr 0.115 CuO4 in a broad temperature range across the charge and spin order transitions (T charge ≃ 80 K, T neutron spin ≃ Tc = 30 K). From the high-precision measurements of the linewidth for the nuclear spin Iz = + 1 / 2 to -1/2 central transition, we show that paramagnetic line broadening sets in precisely at T charge due to enhanced spin correlations within the CuO2 planes. Additional paramagnetic line broadening ensues below ~35 K, signaling that Cu spins in some segments of CuO2 planes are on the verge of three-dimensional magnetic order. A static hyperfine magnetic field arising from ordered Cu moments along the ab plane, however, begins to develop only below T$μSR\atop{spin}$ = 15 – 20 K, where earlier muon spin rotation measurements detected Larmor precession for a small volume fraction (~20 % ) of the sample. Based on the measurement of 139 La nuclear-spin-lattice relaxation rate 1/T1, we also show that charge order triggers enhancement of low-frequency Cu spin fluctuations inhomogeneously; a growing fraction of 139 La sites is affected by enhanced low-frequency spin fluctuations toward the eventual magnetic order, whereas a diminishing fraction continues to exhibit a behavior analogous to the optimally superconducting phase even below Tcharge. In conclusion, these 139La NMR results corroborate our recent 63Cu NMR observation that a very broad, anomalous winglike signal gradually emerges below Tcharge, whereas the normally behaving, narrower main peak is gradually wiped out [T. Imai et al., Phys. Rev. B 96, 224508 (2017)]. Furthermore, we show that the enhancement of low-energy spin excitations in the low-temperature regime below Tneutron spin (≃ Tc) depends strongly on the magnitude and orientation of the applied magnetic field.},
doi = {10.1103/physrevb.97.064511},
journal = {Physical Review B},
number = 6,
volume = 97,
place = {United States},
year = {2018},
month = {2}
}

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Figures / Tables:

FIG. 1 FIG. 1: (a) Representative 139La NMR line shapes measured with a single crystal in Bext = 9 T applied along (a) the c axis and (b) the Cu-O-Cu bond direction within the ab plane. For clarity, the vertical origin is shifted at different temperatures. The solid curves through the cmore » axis results at 220 K and below are the best Gaussian fit, whereas the dashed lines through all other asymmetrical line shapes are a guide for the eyes. Notice that the line shape continues to broaden even below T$^{neutron}_{spin}$ = 30 K for the ab plane, and the relatively sharp peak gives way to a wider flat-topped peak with two shoulders below ∼10 K, as marked by two arrows. Note that the shoulders are hardly observable even at ∼10 K (≪T$^{neutron}_{spin}$).« less

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