Abstract
The quantum criticality of an XXZ-type spin chain antiferromagnet Ca2CoH2(SeO3)4, subjected to an external magnetic field, was investigated through ultralow-temperature specific heat, magnetocaloric effect, and magnetic susceptibility measurements. In the absence of an external magnetic field, the system undergoes an antiferromagnetic phase transition at TN=1.42K. The application of an external field gradually suppresses the antiferromagnetic order. Furthermore, an additional phase emerges in the intermediate field range when the zero-field antiferromagnetic order is suppressed, resulting in a quantum critical point at Bs≈2.55T. Near this field-induced quantum critical point, universal scaling behaviors are observed, characterized by the universality class parameters d=1, ν=1/2, and z=2.
| Original language | English |
|---|---|
| Article number | 235116 |
| Journal | Physical Review B |
| Volume | 110 |
| Issue number | 23 |
| DOIs | |
| State | Published - Dec 15 2024 |
Funding
The research was supported by the National Key Research and Development Program of China (Grant No. 2021YFA1400400), the National Natural Science Foundation of China (Grants No. 12134020, No. 12374146, No. 12104255, No. 22175173, No. 12005243, and No. 11974157), the Stable Support Plan Program of Shenzhen Natural Science Fund (Grant No. 20231121101954003), the Open Fund of the China Spallation Neutron Source Songshan Lake Science City (Grant No. KFKT2023A06), the Guangdong Basic and Applied Basic Research Foundation (Grants No. 2021B1515120015, No. 2022B1515120014, No. 2023B0303000003, and No. 2023B1515120060), the Shenzhen Fundamental Research Program (Grant No. JCYJ20220818100405013), the Pearl River Talent Recruitment Program (Grant No. 2019QN01X716), the Guangdong Provincial Quantum Science Strategic Initiative (Grant No. GD2X2401006), and the Shenzhen Base of the Hefei National Laboratory for Quantum Science and Technology (Grant No. K24200801).