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Title: Spin correlation and spin gap in quasi-one-dimensional spin-1/2 cuprate oxides: A {sup 63}Cu NMR study

Abstract

The Cu-NMR nuclear relaxation rate, {sup 63}(1/{ital T}{sub 1}) and Gaussian spin-echo decay rate, {sup 63}(1/{ital T}{sub 2{ital G}}) have been measured in order to investigate the low-energy spin dynamics in the quasi 1-D spin-1/2 antiferromagnetic (AF) cuprates such as Ca{sub 2}CuO{sub 3} with single chain, SrCuO{sub 2} at ambient pressure (AP) with zigzag chain coupled by weak ferromagnetic exchange interaction, SrCu{sub 2}O{sub 3} and Sr{sub 2}Cu{sub 3}O{sub 5} comprising of two- and three-leg ladder, respectively with isotropic AF exchange interaction along and between chains. In Ca{sub 2}CuO{sub 3}, 1/{ital T}{sub 1} stays constantly close to the 3D magnetic ordering temperature, {ital T}{sub {ital N}} =10 K, dominated by dissipation of overdamped spinons gas as shown by Sachdev. By contrast, in AP-SrCuO{sub 2}, 1/{ital T}{sub 1} below 100 K decreases markedly down to the 3D magnetic ordering temperature, {ital T}{sub {ital N}} =3 K, providing a signature that the frustrated ferromagnetic interaction between CuO zigzag chains makes the spin gap open. In the spin-1/2 ladder compounds of SrCu{sub 2}O{sub 3} and Sr{sub 2}Cu{sub 3}O{sub 5} consisting of two- and three-leg, respectively, the former was demonstrated in the literatures to have the spin gap amounting to a half of AF exchangemore » constant, {ital J}/2 where {ital J}=1300 K. For the latter, the magnetic coherence length, {xi}({ital T}) grows up according to {xi}({ital T}){approximately}1/({ital T}{minus}{theta}) and as a result, the magnetic ordering emerges around 50-60 K accompanying the divergence of 1/{ital T}{sub 1}. In the compounds composed of single and triple chains, it is shown that there is no analog of renormalized classical region identified in the 2D spin-1/2 cuprate such as La{sub 2}CuO{sub 4}, but the spin dynamics is in the quantum critical regime over wide {ital T} range due to the finite size of chains, even though the 3D magnetic ordering takes place at very low temperature.« less

Authors:
; ; ; ;  [1]; ; ;  [2]
  1. Department of Material Physics, Faculty of Engineering Science, Osaka University, Toyonaka, Osaka-fu 560 (Japan)
  2. Institute for Chemical Research, Kyoto University, Uji, Kyoto-fu 611 (Japan)
Publication Date:
OSTI Identifier:
282798
Resource Type:
Journal Article
Journal Name:
Physical Review, B: Condensed Matter
Additional Journal Information:
Journal Volume: 53; Journal Issue: 5; Other Information: PBD: Feb 1996
Country of Publication:
United States
Language:
English
Subject:
66 PHYSICS; CALCIUM OXIDES; SPIN; CUPRATES; LANTHANUM OXIDES; STRONTIUM OXIDES; ANTIFERROMAGNETIC MATERIALS; CHAINS; COPPER 63; ENERGY GAP; EXCHANGE INTERACTIONS; NMR SPECTRA; RELAXATION TIME; SPIN ECHO; LINEAR CHAINS; ONE-DIMENSIONAL SYSTEMS; SPIN CORRELATIONS

Citation Formats

Ishida, K, Kitaoka, Y, Tokunaga, Y, Matsumoto, S, Asayama, K, Azuma, M, Hiroi, Z, and Takano, M. Spin correlation and spin gap in quasi-one-dimensional spin-1/2 cuprate oxides: A {sup 63}Cu NMR study. United States: N. p., 1996. Web. doi:10.1103/PhysRevB.53.2827.
Ishida, K, Kitaoka, Y, Tokunaga, Y, Matsumoto, S, Asayama, K, Azuma, M, Hiroi, Z, & Takano, M. Spin correlation and spin gap in quasi-one-dimensional spin-1/2 cuprate oxides: A {sup 63}Cu NMR study. United States. https://doi.org/10.1103/PhysRevB.53.2827
Ishida, K, Kitaoka, Y, Tokunaga, Y, Matsumoto, S, Asayama, K, Azuma, M, Hiroi, Z, and Takano, M. 1996. "Spin correlation and spin gap in quasi-one-dimensional spin-1/2 cuprate oxides: A {sup 63}Cu NMR study". United States. https://doi.org/10.1103/PhysRevB.53.2827.
@article{osti_282798,
title = {Spin correlation and spin gap in quasi-one-dimensional spin-1/2 cuprate oxides: A {sup 63}Cu NMR study},
author = {Ishida, K and Kitaoka, Y and Tokunaga, Y and Matsumoto, S and Asayama, K and Azuma, M and Hiroi, Z and Takano, M},
abstractNote = {The Cu-NMR nuclear relaxation rate, {sup 63}(1/{ital T}{sub 1}) and Gaussian spin-echo decay rate, {sup 63}(1/{ital T}{sub 2{ital G}}) have been measured in order to investigate the low-energy spin dynamics in the quasi 1-D spin-1/2 antiferromagnetic (AF) cuprates such as Ca{sub 2}CuO{sub 3} with single chain, SrCuO{sub 2} at ambient pressure (AP) with zigzag chain coupled by weak ferromagnetic exchange interaction, SrCu{sub 2}O{sub 3} and Sr{sub 2}Cu{sub 3}O{sub 5} comprising of two- and three-leg ladder, respectively with isotropic AF exchange interaction along and between chains. In Ca{sub 2}CuO{sub 3}, 1/{ital T}{sub 1} stays constantly close to the 3D magnetic ordering temperature, {ital T}{sub {ital N}} =10 K, dominated by dissipation of overdamped spinons gas as shown by Sachdev. By contrast, in AP-SrCuO{sub 2}, 1/{ital T}{sub 1} below 100 K decreases markedly down to the 3D magnetic ordering temperature, {ital T}{sub {ital N}} =3 K, providing a signature that the frustrated ferromagnetic interaction between CuO zigzag chains makes the spin gap open. In the spin-1/2 ladder compounds of SrCu{sub 2}O{sub 3} and Sr{sub 2}Cu{sub 3}O{sub 5} consisting of two- and three-leg, respectively, the former was demonstrated in the literatures to have the spin gap amounting to a half of AF exchange constant, {ital J}/2 where {ital J}=1300 K. For the latter, the magnetic coherence length, {xi}({ital T}) grows up according to {xi}({ital T}){approximately}1/({ital T}{minus}{theta}) and as a result, the magnetic ordering emerges around 50-60 K accompanying the divergence of 1/{ital T}{sub 1}. In the compounds composed of single and triple chains, it is shown that there is no analog of renormalized classical region identified in the 2D spin-1/2 cuprate such as La{sub 2}CuO{sub 4}, but the spin dynamics is in the quantum critical regime over wide {ital T} range due to the finite size of chains, even though the 3D magnetic ordering takes place at very low temperature.},
doi = {10.1103/PhysRevB.53.2827},
url = {https://www.osti.gov/biblio/282798}, journal = {Physical Review, B: Condensed Matter},
number = 5,
volume = 53,
place = {United States},
year = {Thu Feb 01 00:00:00 EST 1996},
month = {Thu Feb 01 00:00:00 EST 1996}
}