The novel positive colossal electroresistance in PbPdO2 thin film with (002) preferred orientation

Effects of V and Gd doping on novel positive colossal electroresistance and quantum transport in PbPdO2 thin films with (002) preferred orientation

“…This indicates that different ion dopings also change the percentage of lead vacancies in the sample. Combined with our previous reports, 31 it can be seen that there exist Pb vacancies in PbPdO 2 , PbPd 0.9 V 0.1 O 2 and PbPd 0.9 Gd 0.1 O 2 films, which are caused by the volatilization of Pb during the heating process. In addition, the doping of V and Gd ions replaces Pd in the PbPdO 2 lattice and further changes the Pd-O hybridization in the PbPdO 2 lattice.…”

“…In addition, according to the results of EDS, the atomic ratio of Pb/Pd/V = 0.809/1/0.032 and Pb/Pd/Gd = 0.958/1/0.014 for PbPd 0.9 V 0.1 O 2 and PbPd 0.9 Gd 0.1 O 2 thin films can be obtained. Compared with Pb/Pd = 0.810/1 of the PbPdO 2 film prepared from the same batch, 31 the content of Pb vacancy in the PbPd 0.9 V 0.1 O 2 film is similar, while the content of Pb vacancy in the PbPd 0.9 Gd 0.1 O 2 film is lower. The percentage of Pb vacancy is 19.1% in the PbPd 0.9 V 0.1 O 2 film but 4.2% in the PbPd 0.9 Gd 0.1 O 2 film.…”

“…Here, it is similar to the positive CER effects found in PbPd 0.9 V 0.1 O 2 and PbPd 0.9 Gd 0.1 O 2 thin films compared to the pure PbPdO 2 thin film. 31 When T = 10 K and I = 1 mA, the positive CER value of the PbPd 0.9 V 0.1 O 2 film can reach 3816%. For the Gd-doped sample, as T = 10 K and I = 1 mA, the positive CER value of the film is 154%.…”

“…This is consistent with the regulating effect of different currents on the CER effect of the PbPdO 2 thin film. 31 In order to further explain the CER mechanism and electrical transport properties of thin films, we established an internal electric field model based on previous studies. 31 Due to the vacancy of the Pb atom in the thin films, the electrons around the oxygen atom will be greatly affected.…”

“…Based on our previous work, PbPdO 2 films with the (002) preferred orientation were prepared by pulsed laser deposition, and the resistance and resistivity of PbPdO 2 films with different direct currents were measured. 31 The positive CER effect induced by current was observed for the first time in PbPdO 2 thin films. At the same time, it was found that a critical temperature of T c = 260 K exists for all the thermal effects of the impressed current resistance.…”