Zeng-wei Zhu

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Publications (3)1.8 Total impact

  • Article: Magneto-thermopower of parent compound LaFeAsO
    Zeng-wei Zhu, Qian Tao, Yu-ke Li, Mi He, Guang-han Cao, Zhu-an Xu
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    ABSTRACT: We report the effect of magnetic field on the transport properties of polycrystalline parent compound LaFeAsO. The magnetic field has no significant influence on the structural phase transitions or spin density wave (SDW) ordering of small moments on iron, but causes large positive magento-resistance below 100 K. Meanwhile, the absolute magnitude of thermopower, which is negative, increases remarkably with increasing magnetic field below 100 K. Such a large positive magneto-thermopower was first reported in this iron arsenide. The result suggests that there could exist an enhancement of SDW gapping in holelike Fermi surface.
    Frontiers of Physics in China 04/2012; 4(4):455-458. · 0.90 Impact Factor
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    Article: Superconductivity above 50 K in Tb$_{1-x}$Th$_{x}$FeAsO
    Lin-jun Li, Yu-ke Li, Zhi Ren, Yong-kang Luo, Xiao Lin, Mi He, Qian Tao, Zeng-wei Zhu, Guang-Han Cao, Zhu-An Xu
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    ABSTRACT: We have successfully synthesized one member of LnFeAsO (Ln stands for lanthanides) with Ln=Tb. By partial substitution of Tb$^{3+}$ by Th$^{4+}$, superconductivity with onset $T_{c}$ up to 52 K was observed. In the undoped parent compound, the magnetic moments of Tb$^{3+}$ ions order antiferromagnetically (AFM) at $T_N$ of 2.5 K, and there exists an anomaly in the resistivity at $T^*$ of about 124 K which corresponds to the structural phase transition and/or AFM ordering of magnetic moments of Fe$^{2+}$ ions. This anomaly is severely suppressed by Th doping, similar to the cases of F doped LnFeAsO series. Thermopower measurements show that the charge carrier is electron-like for both undoped and Th doped compounds, and enhanced thermopower in Th doped samples was observed.
    07/2008;
  • Article: The vortex-like excitations detected by Nernst signals in high- T c superconductors
    Zhu-an Xu, Jing-qin Shen, Zeng-wei Zhu
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    ABSTRACT: The nature of the pseudogap state and its relation to the d-wave superconductivity in high-T c superconductors is still an open issue. The vortex-like excitations detected by the Nernst effect measurements exist in a certain temperature range above superconducting transition temperature T c, which strongly support that the pseudogap phase is characterized by finite pairing amplitude with strong phase fluctuations and imply that the phase transition at T c is driven by the loss of long-range phase coherence. We first briefly introduce the electronic phase diagram and pseudogap state of high-T c superconductors, and then review the results of Nernst effect for different high-T c superconductors. Related theoretical models are also discussed.
    Frontiers of Physics in China 08/2006; 1(3):344-350. · 0.90 Impact Factor
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