New insights into the diverse electronic phases of a novel vanadium dioxide polymorph: a terahertz spectroscopy study.
New insights into the diverse electronic phases of a novel vanadium dioxide polymorph: a terahertz spectroscopy study.
复制标题
DOI：
10.1038/srep09182
复制
发表时间：
2015-03-17
影响因子：
4.6
通讯作者：
Chia EE
中科院分区：
文献类型：
--
作者：
Lourembam J;Srivastava A;La-o-vorakiat C;Rotella H;Venkatesan T;Chia EE
二氧化钒的一个显著特征是它可以以多种晶型合成。用太赫兹时域光谱(THz-TDS)研究了亚稳层状VO2(B)薄膜的电导机制。在VO2(B)中，240 K的临界温度标志着在观察到的复电导率中出现了非零的德鲁德项，这表明从纯绝缘态向金属态的演化。相比之下，著名的VO2(M1)的太赫兹电导率仅通过修改Drude模型来很好地拟合，以包括后向散射。我们还在这两种多态中发现了两种不同的THz导电性区域。绘制了电子相图，揭示了B相中金属-绝缘体转变的宽度和起始位置与M1相中金属-绝缘体转变的发展方向不同。
A remarkable feature of vanadium dioxide is that it can be synthesized in a number of polymorphs. The conductivity mechanism in the metastable layered polymorph VO2(B) thin films has been investigated by terahertz time-domain spectroscopy (THz-TDS). In VO2(B), a critical temperature of 240 K marks the appearance of a non-zero Drude term in the observed complex conductivity, indicating the evolution from a pure insulating state towards a metallic state. In contrast, the THz conductivity of the well-known VO2(M1) is well fitted only by a modification of the Drude model to include backscattering. We also identified two different THz conductivity regimes separated by temperature in these two polymorphs. The electronic phase diagram is constructed, revealing that the width and onset of the metal-insulator transition in the B phase develop differently from the M1 phase.
登录
查看更多内容
影响因子：
56.9
作者：
Jeong, Jaewoo;Aetukuri, Nagaphani;Parkin, Stuart S. P.
通讯作者：
Parkin, Stuart S. P.
DOI：
10.1109/2944.571775
发表时间：
1996-09-01
影响因子：
4.9
作者：
Duvillaret, L;Garet, F;Coutaz, JL
通讯作者：
Coutaz, JL
影响因子：
8.6
作者：
Aguilar, R. Valdes;Stier, A. V.;Armitage, N. P.
通讯作者：
Armitage, N. P.
影响因子：
3.3
作者：
Galy, J
通讯作者：
Galy, J
影响因子：
3.7
作者：
Baxter, Jason B.;Schmuttenmaer, Charles A.
通讯作者：
Schmuttenmaer, Charles A.