Giant orbital diamagnetism of three-dimensional Dirac electrons in <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>Sr</mml:mi><mml:mn>3</mml:mn></mml:msub><mml:mi>PbO</mml:mi></mml:mrow></mml:math> antiperovskite
S. Suetsugu, Kentaro Kitagawa, Toshikaze Kariyado, Andreas W. Rost, J. Nuss, Christiane Mühle, Masao Ogata, H. Takagi
Abstract
Interband mixing in Dirac semimetals has been known theoretically to give rise to a giant orbital diamagnetism when the Fermi level is close to the Dirac point. Here, the authors report a ${}^{207}$Pb NMR study on the three-dimensional Dirac antiperovskite system Sr${}_{3}$PbO. The analysis of the Knight shift, the magnetic susceptibility, and the spin-lattice relaxation rate for samples with different Fermi levels shows that the enhanced diamagnetism in the bulk magnetic susceptibility of Sr${}_{3}$PbO does indeed originate from the orbital contribution of Dirac electrons.
Topics & Concepts
DiamagnetismCondensed matter physicsPhysicsKnight shiftElectronMagnetic susceptibilitySuperconductivityQuantum mechanicsMagnetic fieldTopological Materials and PhenomenaGraphene research and applicationsThermal Expansion and Ionic Conductivity