Unusual magnetic excitations in the weakly ordered spin $\frac{1}{2}$ chain antiferromagnet ${\mathrm{Sr}}_{2}{\mathrm{CuO}}_{3}$: Possible evidence for Goldstone magnon coupled with the amplitude mode
Abstract
We report on an electron spin resonance (ESR) study of a nearly onedimensional (1D) spin1/2 chain antiferromagnet, Sr _{2}CuO _{3}, with extremely weak magnetic ordering. The ESR spectra at T > T _{N}, in the disordered Luttingerspinliquid phase, reveal nearly ideal Heisenbergchain behavior with only a very small, fieldindependent linewidth, ~1/T. In the ordered state, below T _{N}, we identify fielddependent antiferromagnetic resonance modes, which are well described by pseudoGoldstone magnons in the model of a collinear biaxial antiferromagnet. Additionally, we observe a major resonant mode with unusual and strongly anisotropic properties, which is not anticipated by the conventional theory of Goldstone spin waves. Lastly, we propose that this unexpected magnetic excitation can be attributed to a fieldindependent magnon mode renormalized due to its interaction with the highenergy amplitude (Higgs) mode in the regime of weak spontaneous symmetry breaking.
 Authors:

 P. Kapitza Institute for Physical Problems, Moscow (Russia)
 P. Kapitza Institute for Physical Problems, Moscow (Russia); High School of Economics, Moscow (Russia)
 Brookhaven National Lab. (BNL), Upton, NY (United States)
 Publication Date:
 Research Org.:
 Brookhaven National Lab. (BNL), Upton, NY (United States)
 Sponsoring Org.:
 USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC22)
 OSTI Identifier:
 1345730
 Alternate Identifier(s):
 OSTI ID: 1339768
 Report Number(s):
 BNL1135312017JA
Journal ID: ISSN 24699950; PRBMDO; R&D Project: PO010; KC0201060; TRN: US1700963
 Grant/Contract Number:
 SC00112704
 Resource Type:
 Accepted Manuscript
 Journal Name:
 Physical Review B
 Additional Journal Information:
 Journal Volume: 95; Journal Issue: 2; Journal ID: ISSN 24699950
 Publisher:
 American Physical Society (APS)
 Country of Publication:
 United States
 Language:
 English
 Subject:
 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Sergeicheva, E. G., Sosin, S. S., Prozorova, L. A., Gu, G. D., and Zaliznyak, I. A. Unusual magnetic excitations in the weakly ordered spin 12 chain antiferromagnet Sr2CuO3: Possible evidence for Goldstone magnon coupled with the amplitude mode. United States: N. p., 2017.
Web. doi:10.1103/PhysRevB.95.020411.
Sergeicheva, E. G., Sosin, S. S., Prozorova, L. A., Gu, G. D., & Zaliznyak, I. A. Unusual magnetic excitations in the weakly ordered spin 12 chain antiferromagnet Sr2CuO3: Possible evidence for Goldstone magnon coupled with the amplitude mode. United States. doi:10.1103/PhysRevB.95.020411.
Sergeicheva, E. G., Sosin, S. S., Prozorova, L. A., Gu, G. D., and Zaliznyak, I. A. Wed .
"Unusual magnetic excitations in the weakly ordered spin 12 chain antiferromagnet Sr2CuO3: Possible evidence for Goldstone magnon coupled with the amplitude mode". United States. doi:10.1103/PhysRevB.95.020411. https://www.osti.gov/servlets/purl/1345730.
@article{osti_1345730,
title = {Unusual magnetic excitations in the weakly ordered spin 12 chain antiferromagnet Sr2CuO3: Possible evidence for Goldstone magnon coupled with the amplitude mode},
author = {Sergeicheva, E. G. and Sosin, S. S. and Prozorova, L. A. and Gu, G. D. and Zaliznyak, I. A.},
abstractNote = {We report on an electron spin resonance (ESR) study of a nearly onedimensional (1D) spin1/2 chain antiferromagnet, Sr2CuO3, with extremely weak magnetic ordering. The ESR spectra at T > TN, in the disordered Luttingerspinliquid phase, reveal nearly ideal Heisenbergchain behavior with only a very small, fieldindependent linewidth, ~1/T. In the ordered state, below TN, we identify fielddependent antiferromagnetic resonance modes, which are well described by pseudoGoldstone magnons in the model of a collinear biaxial antiferromagnet. Additionally, we observe a major resonant mode with unusual and strongly anisotropic properties, which is not anticipated by the conventional theory of Goldstone spin waves. Lastly, we propose that this unexpected magnetic excitation can be attributed to a fieldindependent magnon mode renormalized due to its interaction with the highenergy amplitude (Higgs) mode in the regime of weak spontaneous symmetry breaking.},
doi = {10.1103/PhysRevB.95.020411},
journal = {Physical Review B},
number = 2,
volume = 95,
place = {United States},
year = {2017},
month = {1}
}
Web of Science
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