Magnetic properties of Mn and Co doped PbPdO2

Abstract

We report the dramatic change of gapless semiconductor properties by different chemical doping elements of Co and Mn into PbPdO2. The metal-insulatorlike transition temperature TMI = 100 K for PbPdO2 shifts to a higher temperature of 150 K by the Co doping and to a lower temperature of 70 K by the Mn doping. Because of the anisotropic band structure with the majority of heavy holes and the minority of light electrons, the transport and magnetic properties are significantly changed by the chemical doping elements. At low temperatures, the Co doping enhances ferromagnetic interactions, whereas the Mn doping favors antiferromagnetic interactions. These results are of great interests because you can control the magnetic ordering as well as manipulate the carrier density by changing the doping elements. These materials could be a good candidate for spintronics applications.

Magnetic versus nonmagnetic ion substitution effects in gapless semiconductor PbPdO2

“…The slight difference of T MI comes from the different doping elements, which was also observed in other doping systems such as Mn-and Co-doped PbPdO 2 . 10,11 In the measured temperature range from 2 to 300 K, the resistivity data of PbPdO 2 are between the values of PbPd 0.9 Zn 0.1 O 2 and PbPd 0.9 Cu 0.1 O 2 . Compared with the undoped PbPdO 2 , the data taken in PbPd 0.9 Zn 0.1 O 2 are lower and the data in PbPd 0.9 Cu 0.1 O 2 is higher.…”

“…8,9 In addition, our previous studies showed that the magnetic ground states of PbPdO 2 are tuned from ferromagnetic to antiferromagnetic by Co and Mn doping, respectively, and the valence states of Co and Mn are trivalent and tetravalent. [10][11][12] Most of the studies have been done on the magnetically doped PbPdO 2 . [4][5][6][7][8][9][10][11][12][13][14][15] In this work, we investigate the fundamental physical properties of Zn-and Cu-doped PbPdO 2 , i.e., PbPd 0.9 Zn 0.1 O 2 , and PbPd 0.9 Cu 0.1 O 2 , which are diamagnetic and paramagnetic, respectively.…”

“…[10][11][12] Most of the studies have been done on the magnetically doped PbPdO 2 . [4][5][6][7][8][9][10][11][12][13][14][15] In this work, we investigate the fundamental physical properties of Zn-and Cu-doped PbPdO 2 , i.e., PbPd 0.9 Zn 0.1 O 2 , and PbPd 0.9 Cu 0.1 O 2 , which are diamagnetic and paramagnetic, respectively. These different magnetic states are related with the O 2p-Pd 4d hybridized states interacting with the different 3d electronic states of Zn and Cu ions.…”

“…10,11 The stoichiometric amounts of PbO, PdO, and ZnO/CuO were ground and pelletized. We added an extra 5 atomic percent of PbO because of the volatility of Pb.…”

Electronic structure of the spin gapless material Co-doped PbPdO2

“…This exciting proposal attracted renewed attention to PbPdO 2 (Refs. [3][4][5] and also led to theoretical studies in which some other materials were predicted to be SGS candidates. [6][7][8][9][10][11][12] Experimentally, pure PbPdO 2 was known to be a narrow gap or nearly gapless semiconductor.…”