Ag_(2+δ)Te薄膜的低温纵向磁电阻效应

LOW TEMPERATURE LONGITUDINAL MAGNETORESIS TANCE EFFECT IN Ag_(2+δ) Te THIN FILMS

采用高真空电子束蒸发镀膜方法制备了不同结构的ＡｇＴｅ 多层膜，通过热处理得到了不同自掺杂浓度δ的非磁性Ａｇ２＋ δＴｅ 薄膜．Ａｇ２．１Ｔｅ 薄膜在低温下有很大的负纵向磁电阻，并且出现电阻率和磁电阻的多重峰现象．这可能与Ａｇ 的掺杂浓度δ和测量温度有很大关系，用掺杂的能带理论解释了有关的多重峰现象．

Abnormal longitudinal magnetoresistance (LMR) in self\|doped silver telluride films at low temperature is investigated. In the Ag\-\{2.1\}Te films, we observe the large negative LMR and the multi\|peaks in magnetic resistivity ρ and LMR that strongly depend on doping concentration and temperature. The abnormal MR behavior, which might result from the complex structure and texture of the films, is explained by means of Toyozawa model.