Publication Date:
2016-03-02
Description:
Author(s): Hechang Lei (雷和畅), Kai Liu (刘凯), Jun-ichi Yamaura, Sachiko Maki, Youichi Murakami, Zhong-Yi Lu (卢仲毅), and Hideo Hosono In quasi-one-dimensional (quasi-1D) systems, because of the finite interchain coupling and fluctuation, the charge density wave (CDW) transition temperature T CDW is much lower than the mean-field-theory predicted T MF and the CDW fluctuation region exists between T CDW and T MF . Usually, CDW fluctuation has little effect on the electronic transport properties. Moreover, the CDW state is usually insensitive to magnetic field. The work done here on a PdTeI single crystal with quasi-1D PdTe chains shows that the above statements need to be revisited. It is found that the CDW fluctuation leads to a gradual decrease of carrier concentration before the static long-range CDW order occurs at T 1 ~110 K. On the other hand, the pinning and sliding of CDW state are observed below T 2 ~6 K. When such a low T 2 is combined with the existence of multiple quasi-1D bands, PdTeI exhibits exotic crossover behavior from negative to huge positive magnetoresistance under magnetic field and field-induced localization. It indicates that the CDW fluctuation could have a remarkable influence on transport properties of CDW materials. Moreover, there is an interaction between the CDW state and magnetic field. [Phys. Rev. B 93, 121101(R)] Published Tue Mar 01, 2016
Keywords:
Electronic structure and strongly correlated systems
Print ISSN:
1098-0121
Electronic ISSN:
1095-3795
Topics:
Physics
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