2016/06/30 by Shou-Shu Gong, Wei Zhu, W. Zhu +2
Materials Science · Physics and Astronomy · #Advanced Condensed Matter Physics #Antiferromagnetism #Condensed matter physics #Ground state #Iron-based superconductors research #Ising model #Liquid crystal #Neutron scattering #Paramagnetism #Phase (matter) #Phase diagram #Physics #Physics of Superconductivity and Magnetism #Quantum mechanics #Quantum spin liquid #Scattering #Spin (aerodynamics) #Spin polarization #Square lattice #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.95.205132
published as Phys. Rev. B 95, 205132 (2017) · 4 pages, 5 figures, with supplemental material
openalex created_date 2016/06/24 · openalex publication_date 2017/05/19 · arxiv created 2017/08/21 · arxiv updated 2017/08/22 · openalex updated_date 2026/08/06
The exotic normal state of iron chalcogenide superconductor FeSe, which exhibits vanishing magnetic order and possesses an electronic nematic order, triggered extensive explorations of its magnetic ground state. To understand its novel properties, we study the ground state of a highly frustrated spin-1 system with bilinear-biquadratic interactions using an unbiased large-scale density matrix renormalization group. Remarkably, with increasing biquadratic interactions, we find a paramagnetic phase between N'eel and stripe magnetic ordered phases. We identify this phase as a candidate of nematic quantum spin liquid by the compelling evidences, including vanished spin and quadrupolar orders, absence of lattice translational symmetry breaking, and a persistent nonzero lattice nematic order in the thermodynamic limit. The established quantum phase diagram naturally explains the observations of enhanced spin fluctuations of FeSe in neutron scattering measurement and the phase transition with increasing pressure. This identified paramagnetic phase provides a possibility to understand the novel properties of FeSe.