Third-Order Magnetic Susceptibility of an Ideal Fermi Gas

• 来源期刊: 理论物理通讯（英文版）
• 年，卷（期）: 2018,（11）
• 页码范围: 619-624
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/0253-6102/70/5/619

摘要

At low temperature and under weak magnetic field,non-interacting Fermi gases reveal both Pauli paramagnetism and Landau diamagnetism,and the magnitude of the diamagnetic susceptibility is 1/3 of that of the paramagnetic one.When the temperature is finite and the magnetic field is also finite,we demonstrate that the paramagnetism and diamagnetism start to deviate from the ratio 1/3.For understanding the magnetic properties of an ideal Fermi gas at quite low temperature and under quite weak magnetic field,we work out explicitly the third-order magnetic susceptibility in three cases,from intrinsic spin,orbital motion and in total.An interesting property is in third-order magnetic susceptibifities:when viewing individually,they are both diamagnetic,but in total it is paramagnetic.