Physical Properties Of Topological Materials Lanthanide Antimonide PrSb And DySb Under High Pressures

Topological materials have peculiar surface states and low-energy electron transport.These properties are due to the strict symmetry protection of topological quantum states.Topological quantum states have high stability to common material impurities,defects or disorder,and can change their topological properties through quantum control or phase transition.This emerging research area provides a variety of possibilities for future electronic materials and devices,and even information technology innovation based on quantum topology systems and computing.As we all know,there are many ways to modulate the physical properties of materials.Among them,we want to change the properties of materials but do not introduce impurities.The means of pressure is relatively pure.The study found that the topological materials under high pressure will undergo structural phase changes,energy band reversal and many other physical property changes,which opens a door for exploring the properties of topological materials.In this paper,on the basis of extensive research on the topological materials and experimental findings under high pressure,the electrical transport of topological materials lanthanide antimonide Dy Sb and Pr Sb under high pressure is studied.A diamond anvil?DAC?combined with a comprehensive physical property measurement system was used to measure the electrical resistivity,Hall coefficient,and magnetic resistance of the material under high-pressure environment.Some interesting physical phenomena were observed,analyzed,and discussed.This study provides experimental support and data accumulation for exploring the properties of topological materials under high pressure,which is of great scientific significance.First,we measured the change in resistivity of the topological material lanthanide antimonide Pr Sb under different hydrostatic pressures?maximum pressure P = 5.72 GPa?with temperature,and found that Pr Sb is paramagnetic under normal pressure.It changes from a Van Vleck paramagnet to an induction moment antiferromagnet through pressure modulation,because the 4f'2 configuration of Pr³⁺ is close to the singlet-singlet state at point X,and the energy of the longitudinal excitons decreases with the applied pressure.In addition,the study of the Hall coefficient under high pressure found that the material is a compensated semi-metal,exhibiting a nonlinear behavior with respect to field-dependent Hall resistivity,which indicates that more than one type of carrier are involved in the transmission process.At different temperatures,the Hall coefficient varies with pressure.At 15 K,the Hall coefficient changes at 4.7 GPa,indicating that the system is a mechanism for electron hole compensation.Then,we measured the high pressure resistance and magnetoresistance of the topological material lanthanide antimonide Dy Sb?maximum pressure P = 22.51 GPa?and found that Dy Sb exhibited an antiferromagnetic transition at 10 K.After 13.24 GPa,the resistivity increases faster,and the antiferromagnetic transition also becomes weaker.The superconducting state appears under this pressure and Tc = 2.28 K.The resistivity at 300 K decreases first and then increases with increasing pressure,and the minimum value corresponds to the occurrence of superconducting transition.The appearance of superconductivity can be attributed to the transformation of NaCl-Cs Cl type structure.The slope of MR changes at a pressure of around 10.2 GPa,which also corresponds to the occurrence of superconducting transition.