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Welcome to Jun Zhao's group!
We use various neutron scattering techniques, along with other probes including X-ray scattering and transport measurements, to study strongly correlated systems, such as unconventional superconductors, low-dimensional magnets, frustrated systems and other transition-metal or rare-earth materials. Our research focus is on investigating crystal structures, magnetic structures, spin excitations and phase transitions of these systems.

Group News
There are currently openings for graduate students and postdoctoral fellows in our group.
The normal duration of the postdoctoral fellow is two years at an annual salary of 210000 CNY.
Interested students please write to Prof. Zhao (zhaoj(at)
July 2017
Our group published a paper entitled "Structure of spin excitations in heavily electron-doped Li0.8Fe0.2ODFeSe superconductors" on Nature Communications [Nature Communications 8, 123 (2017)]. In this work, we used inelastic neutron scattering to study the heavily electron-doped iron-based superconductor Li0.8Fe0.2ODFeSe, revealing nearly ring-shaped magnetic resonant excitations surrounding (pi, pi) at around 21 meV. The observed energy-dependent momentum structure and twisted dispersion of spin excitations near (pi, pi) are analogous to those of hole-doped cuprates in several aspects, thus implying that such spin excitations are essential for the remarkably high Tc in these materials.more
December 2016
Our group published a paper entitled "Evidence for a spinon Fermi surface in a triangular-lattice quantum-spin-liquid candidate" on Nature [Nature 540, 559-562 (2016)]. In this work, we used inelastic neutron scattering to study the quantum spin liquid candidate YbMgGaO4 and found broad spin excitations covering a wide region of the Brillouin zone. The observed diffusive spin excitation persists at the lowest measured energy and shows a clear upper excitation edge, consistent with the particle–hole excitation of a spinon Fermi surface. Our results therefore point to the existence of a quantum spin liquid state with a spinon Fermi surface in YbMgGaO4, which has a perfect spin-1/2 triangular lattice as in the original proposal of quantum spin liquids.more
July 2016
Our group published a paper entitled "Magnetic ground state of FeSe" on Nature Communications [Nature Communications 7, 12182 (2016)]. In this work, we report inelastic neutron-scattering experiments in FeSe single crystals that reveal both stripe and Neel spin fluctuations over a wide energy range at 110 K. On entering the nematic phase, a substantial amount of spectral weight is transferred from the Neel to the stripe spin fluctuations. Moreover, the total fluctuating magnetic moment of FeSe is about 60% larger than that in the iron pnictide BaFe2As2. Our results suggest that FeSe is a novel S=1 nematic quantum-disordered paramagnet interpolating between the Neel and stripe magnetic instabilities.more
February 2016
Our group published a paper entitled "Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe" on Nature Materials [Nature Materials 15, 159–163 (2016)]. In this work, we study FeSe by neutron scattering, finding substantial stripe spin fluctuations coupled with the nematicity that are enhanced abruptly on cooling through Ts. A sharp spin resonance develops in the superconducting state, whose energy (about 4 meV) is consistent with an electron–boson coupling mode revealed by scanning tunnelling spectroscopy. The magnetic spectral weight in FeSe is found to be comparable to that of the iron arsenides. Our results support recent theoretical proposals that both nematicity and superconductivity are driven by spin fluctuations.more
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