کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7888505 | 1509795 | 2018 | 5 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Metal-to-insulator transition and its effective manipulation studied from investigations in V1-xNbxO2 bulks
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
Nb doping effects on crystalline structure, transport transition and magnetic properties are investigated for V1-xNbxO2 (0 â¤x⤠5%) bulks. At room temperature, doping does not change structure of monoclinic phase but causes an increase in lattice parameters for the range of x⤠3%, further doping leads to a structure transition to rutile tetragonal phase. Each sample simultaneously displays a transition to insulating behavior and a sharp decrease in susceptibility below an almost same critical temperature (Tc). The Tc is shown to shift from ~ 340 K at x = 0 to ~ 277 K at x = 5% at a rate of ~ â13 K/at%. It is argued that the observed sharp decrease in susceptibility originates from the formation of V-V dimers with spins in anti-parallel, while the insulating behavior below Tc is due to the electron movement from one dimerized state to another with the help of Variable-Range-Hopping mechanism. Furthermore, it is proposed that doping by larger cations, which would suppress the formation of dimers, can be used to manipulate the metal-insulator transition to lower temperatures.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 44, Issue 3, 15 February 2018, Pages 2809-2813
Journal: Ceramics International - Volume 44, Issue 3, 15 February 2018, Pages 2809-2813
نویسندگان
Run Zhang, Chongyang Yin, Qingshan Fu, Canglong Li, Guoyu Qian, Xinghan Chen, Chengliang Lu, Songliu Yuan, Xiujian Zhao, Haizheng Tao,