TY - JOUR
T1 - Spin Excitations of the S = 1=2 One-Dimensional Ising-Like Antiferromagnet BaCo2V2O8 in Transverse Magnetic Fields
AU - Okutani, Akira
AU - Onishi, Hiroaki
AU - Kimura, Shojiro
AU - Takeuchi, Tetsuya
AU - Kida, Takanori
AU - Mori, Michiyasu
AU - Miyake, Atsushi
AU - Tokunaga, Masashi
AU - Kindo, Koichi
AU - Hagiwara, Masayuki
N1 - Funding Information:
Acknowledgment The experimental work was supported by Grants-in-Aid for Scientific Research (Nos. 25220803, 24244059, and 25246006) from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan, and by the JSPS Core-to-Core Program, A. Advanced Research Networks. We thank Z. He for providing a sample for magnetization measurements, and M. Akaki for helping with sample preparation for the magnetostriction measurements. H.O. was supported by JSPS KAKENHI Grants Nos. JP16K05494 and JP19K03678. A part of the computations was performed on supercomputers at the Japan Atomic Energy Agency and at the Institute for Solid State Physics, the University of Tokyo. M.M. was supported by JSPS Grant No. JP20K03810 and by the Inter-University Cooperative Research Program (No. 20N0006) of the Center of Neutron Science for Advanced Materials, Institute for Materials Research, Tohoku University.
Publisher Copyright:
© 2021 Physical Society of Japan. All rights reserved.
PY - 2021/4/15
Y1 - 2021/4/15
N2 - The high-field multifrequency electron spin resonance (ESR), the magnetization, and the specific heat of single crystals of BaCo2V2O8 (a quasi-one-dimensional Ising-like antiferromagnet with S = 1=2) were measured in two different transverse magnetic fields: H ∥ [100] and H ∥ [110]. A softening of the lowest ESR mode was observed near the saturation field of the magnetization around 40 T in H ∥ [110], whereas it occurs around 10 T in H ∥ [100], far below the saturation field. These observations were reproduced by numerical calculations using the density-matrix renormalization group methods, including the staggered magnetic fields induced by a uniform external magnetic field and the interchain magnetic exchange interaction. We found that the directional dependence of the lowest mode originates mainly from the remarkable angular dependence of the induced magnetic field. The interchain interaction is also quantitatively important for reproducing the experimental results. The directional dependence of the lowest mode is demonstrated by the particle-hole excitation of spinons using the Jordan-Wigner transformation.
AB - The high-field multifrequency electron spin resonance (ESR), the magnetization, and the specific heat of single crystals of BaCo2V2O8 (a quasi-one-dimensional Ising-like antiferromagnet with S = 1=2) were measured in two different transverse magnetic fields: H ∥ [100] and H ∥ [110]. A softening of the lowest ESR mode was observed near the saturation field of the magnetization around 40 T in H ∥ [110], whereas it occurs around 10 T in H ∥ [100], far below the saturation field. These observations were reproduced by numerical calculations using the density-matrix renormalization group methods, including the staggered magnetic fields induced by a uniform external magnetic field and the interchain magnetic exchange interaction. We found that the directional dependence of the lowest mode originates mainly from the remarkable angular dependence of the induced magnetic field. The interchain interaction is also quantitatively important for reproducing the experimental results. The directional dependence of the lowest mode is demonstrated by the particle-hole excitation of spinons using the Jordan-Wigner transformation.
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U2 - 10.7566/JPSJ.90.044704
DO - 10.7566/JPSJ.90.044704
M3 - Article
AN - SCOPUS:85103233914
SN - 0031-9015
VL - 90
JO - Journal of the Physical Society of Japan
JF - Journal of the Physical Society of Japan
IS - 4
M1 - 044704
ER -