DM-induced frustration of the weakly coupled Heisenberg chains

8th International Conference on Highly Frustrated Magnetism 2016

Jin, Wen^1 ; Starykh, Oleg A.^1

Department of Physics and Astronomy, University of Utah, Salt Lake City

UT

84112, United States^1

关键词: Adjacent chains;    Antiferromagnetic spins;    Critical fields;    Dzyaloshinskii-moriya;    Field temperature;    Heisenberg chains;    Mean field;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/828/1/012019/pdf
DOI  :  10.1088/1742-6596/828/1/012019

来源: IOP

【 摘 要 】

We present theoretical procedure for estimating interchain exchange coupling J′ between antiferromagnetic spin-1/2 Heisenberg chains with frustration due to Dzyaloshinskii-Moriya (DM) interaction characterized by DM vectors Dywhich are uniform within each chain y, but staggered between adjacent chains, Dy∼ (-1)yD. Under a magnetic field hD we obtain a field-temperature phase diagram which favorably agrees with the one experimentally observed. We then apply chain mean-field (CMF) technique to calculate interchain exchange J′ from the critical field hcat which the transition between the collinear spin-density wave and the cone states takes place. The CMF calculations are found to provide good physical description of the experimental measurements for the wide range of D/J′.