First-Order Antiferromagnetic Transition and Novel Gapless Excitation in a 4f Zigzag Chain Compound YbCuS2

F. Hori; K. Kinjo; S. Kitagawa; K. Ishida; Yudai Ohmagari; T. Onimaru

First-Order Antiferromagnetic Transition and Novel Gapless Excitation in a 4f Zigzag Chain Compound YbCuS2

Strongly Correlated Electrons 2022-01-20 v1

Authors: F. Hori , K. Kinjo , S. Kitagawa , K. Ishida , Yudai Ohmagari , T. Onimaru

Abstract

We report on the 63/65Cu-nuclear magnetic resonance and nuclear quadrupole resonance (NQR) studies of trivalent Yb zigzag chain compound YbCuS2. Sharp NQR signals were observed in the paramagnetic (PM) state. Below TO = 0.95 K, the multi peaks induced by the internal magnetic fields arising from the antferromagnetic (AFM) ordered moments appear and coexist with the PM signal down to 0.85 K, evidencing the first-order AFM phase transition at TO. In addition, the nuclear spin-lattice relaxation rate 1/T1 abruptly decreases below TO and shows the T-linear behavior below 0.5 K. The significant large 1/T1T value strongly suggests the presence of the novel gapless spin excitation in low temperature region.

Keywords

ybcuss2 zigzag chain antiferromagnetic transition nuclear quadrupole resonance gapless excitation spin relaxation

Cite

@article{arxiv.2201.07563,
  title  = {First-Order Antiferromagnetic Transition and Novel Gapless Excitation in a 4f Zigzag Chain Compound YbCuS2},
  author = {F. Hori and K. Kinjo and S. Kitagawa and K. Ishida and Yudai Ohmagari and T. Onimaru},
  journal= {arXiv preprint arXiv:2201.07563},
  year   = {2022}
}

Related papers

View all related →