Abstract
We report neutron scattering and thermodynamic measurements of the quasi-one-dimensional Ising magnet SrCo2V2O8 under transverse fields along the tetragonal a/b direction. Our experiments reveal a Néel-type magnetic order in zero field, which successively changes into a coplanar antiferromagnetic order in applied fields. The detailed evolution of the noncollinear magnetic order in magnetic fields can be understood by considering the competition between the intrinsic magnetic interactions, uniform transverse field, and effective staggered field. Moreover, a series of gapped discrete confined-spinon modes are observed in zero field. With increasing field, the spin gap progressively softens, reaching a minimum value at ∼7T where the Néel-type magnetic ordering moment is completely suppressed. This corresponds to the three-dimensional quantum critical point (QCP). The implications for multiple QCPs in this class of materials are discussed.
| Original language | English |
|---|---|
| Article number | 144405 |
| Journal | Physical Review B |
| Volume | 103 |
| Issue number | 14 |
| DOIs | |
| State | Published - Apr 2 2021 |
| Externally published | Yes |
Funding
This work was partially supported by the National Key R&D Program of the MOST of China (Grant No. 2016YFA0300203), the Innovation Program of Shanghai Municipal Education Commission (Grant No. 2017-01-07-00-07-E00018), the Shanghai Municipal Science and Technology Major Project (Grant No. 2019SHZDZX01), and the National Natural Science Foundation of China (Grant No. 11874119). The identification of any commercial product or trade name does not imply endorsement or recommendation by the National Institute of Standards and Technology.