JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Wei-Bin Wu,Yuan-Qiao Chen,Qi-Ling Xiao,Jun-Yi Ge
The Co-Te system has become a prominent field of research in recent times. CoTe 2 is confirmed to be a Dirac semimetal, while Co 2 Te is predicted to host the quantum anomalous Hall effect. Here, we have successfully grown high-quality Co 2 Te 3 single crystals using the solid-state reaction method and have characterized them using the energy dispersive X-ray spectroscopy, the X-ray diffraction and Laue diffraction. The X-ray rocking curve with a full-width at half-maximum of 0.067° shows Co 2 Te 3 single crystals have good crystalline quality and mosaicity. Co 2 Te 3 single crystals possess a hexagonal structure with the space group of P 6 3 / mmc . Resistivity measurements reveal typical metallic behavior with a transition from Non-Fermi liquid to low-temperature Landau Fermi-liquid behavior around 50 K, which can be fitted by the parallel resistance model. Magnetic measurements show no obvious anisotropy between the in-plane and out-of-plane directions with the presence of a small magnetic hysteresis at 1.8 K. Furthermore, Co 2 Te 3 single crystals undergo a magnetic phase transition around 50 K and an antiferromagnetic transition modulated by the magnetic field below 8 K.
研究领域:
凝聚态物理
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
·
2022
·Vol. 119
·期 51
·e2211193119
·
IF 12.779
Jieming Sheng,Le Wang,Andrea Candini,Wenrui Jiang,Lianglong Huang,Bin Xi,Jize Zhao,Han Ge,Nan Zhao,Ying Fu,Jun Ren,Jiong Yang,Ping Miao,Xin Tong,Dapeng Yu,Shanmin Wang,Qihang Liu,Maiko Kofu,Richard Mole,Giorgio Biasiol,Dehong Yu,Igor A. Zaliznyak,Jia-Wei Mei,Liusuo Wu
An interplay of geometrical frustration and strong quantum fluctuations in a spin-1/2 triangular-lattice antiferromagnet (TAF) can lead to exotic quantum states. Here, we report the neutron-scattering, magnetization, specific heat, and magnetocaloric studies of the recently discovered spin-1/2 TAF Na2BaCo(PO4)2, which can be described by a spin-1/2 easy axis XXZ model. The zero-field neutron diffraction experiment reveals an incommensurate antiferromagnetic ground state with a significantly reduced ordered moment of about 0.54(2) μB/Co. Different magnetic phase diagrams with magnetic fields in the ab plane and along the easy c-axis were extracted based on the magnetic susceptibility, specific heat, and elastic neutron-scattering results. In addition, two-dimensional (2D) spin dispersion in the triangular plane was observed in the high-field polarized state, and microscopic exchange parameters of the spin Hamiltonian have been determined through the linear spin wave theory. Consistently, quantum critical behaviors with the universality class of d = 2 and νz = 1 were established in the vicinity of the saturation field, where a Bose–Einstein condensation (BEC) of diluted magnons occurs. The newly discovered quantum criticality and fractional magnetization phase in this ideal spin-1/2 TAF present exciting opportunities for exploring exotic quantum phenomena.
研究领域:
凝聚态物理
·
量子磁性
·
强关联电子系统
·
低维量子系统
·
中子散射
·
量子相变
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）