Xiao HU

Xiao Hu
Condensed-matter Physics
Academic degree:
Ph.D., Physics, University of Tokyo (1990)
Recent Publications
See NIMS Researchers DB

Educational and Working History

2007 Principal Investigator, MANA, NIMS
2007 Professor, Graduate School of Pure and Applied Science, University of Tsukuba
2002 Group Leader, National Institute for Materials Science (NIMS)
1999 Group Leader, National Research Institute for Metals (NRIM)
1996 Senior Researcher, NRIM
1996 Associated Professor, Institute of Materials Research, Tohoku University
1995 Guest Researcher of National Institute of Standard and Technology, USA
1991 Research Associate, Institute of Materials Research, Tohoku University
1990 Ph.D. Dept. Phys., University of Tokyo

Research History

Understanding on vortex matter in type II superconductivity has experienced great progress since the discovery of high-Tc superconductivity in cuprates. Xiao Hu and his co-workers were the first in the world to clarify successfully the first-order melting transition of the vortex lattice using Monte Carlo simulation. His work in 1997 clearly showed that the vortex lattice melting coincides with the phase transition between superconductivity and normal state. According to text book on high-Tc superconductivity, this contribution is one of the milestones in this field, following others such as the proposal of vortex state by Abrikosov (who got the Nobel Prize in 2003), the proposal to observe vortex lattice melting in high-Tc cuprates (Nelson and Gammel). After that Xiao Hu has made systematic investigations on vortex states, such as the effect of point-like defects on the phase diagram, novel phases and phase diagram of interlayer Josephson vortices, scaling properties of current-driven vortex matter. In contrast to previous theory, Xiao Hu and his co-authors predicted that for interlayer Josephson vortWorkingices the smectic phase can only happen with period 2, and in a narrow region of temperature about 1 Kelvin. The theoretical prediction has been verified by a cutting-edge experiment recently. Xiao Hu and his collaborators have also performed large-scale computer simulation for a novel technique, which uses single crystal of high-Tc superconductor to excite terahertz electromagnetic radiation. They clarified the mechanism of emission, and evaluated the power of electromagnetic wave and the power spectrum, and thus verified the feasibility of the technique. Due to his achievements he is regarded as one of the world-wide leading scientists in the field of vortex states of superconductivity.

Selected Papers

  1. Possible dynamic states in inductively coupled intrinsic Josephson junctions of layered high-Tc superconductors
    Lin SZ, Hu X
    Phys Rev Lett, 2008; 100(24): 247006.
  2. Three-dimensional phase-kink state in a thick stack of Josephson junctions and terahertz radiation
    Hu X, Lin SZ
    Phys Rev B, 2008; 78(13): 134510.
  3. Possible half metallic antiferromagnet in a hole-doped perovskite cuprate predicted by first-principles calculations
    Nie YM, Hu X
    Phys Rev Lett, 2008; 100(11): 117203.
  4. Depinning and creep motion in glass states of flux lines
    Luo MB, Hu X
    Phys Rev Lett, 2007; 98(26): 267002.
  5. Orbital order and ferrimagnetic properties of the new compound Sr8CaRe3Cu4O24
    Wan XG, Kohno M, Hu X
    Phys Rev Lett, 2005; 94(8): 087205.
  6. Density functional theory for freezing transition of vortex-line liquid with periodic layer pinning
    Hu X, Luo MB, Ma YQ
    Phys Rev B, 2005; 72(17): 174503.
  7. Possible spin triplet superconductivity in NaxCoO2yH2O
    Tanaka A, Hu X
    Phys Rev Lett, 2003; 91(25): 257006.
  8. Effects of point defects on the phase diagram of vortex states in high-Tc superconductors in the B || c axis
    Nonomura Y, Hu X
    Phys Rev Lett, 2001; 86(22): 5140-5143.
  9. Possible tricritical point in phase diagrams of interlayer Josephson-vortex systems in high-Tc Superconductors
    Hu X, Tachiki M
    Phys Rev Lett, 2000; 85(12): 2577-2580.
  10. δ-function peak in the specific heat of high-Tc superconductors: Monte Carlo simulation
    Hu X, Miyashita S, Tachiki M
    Phys Rev Lett, 1997; 79(18), 3498-3501.