Haoran Man

Impact of uniaxial pressure on structural and magnetic phase transitions in electron-doped iron pnictides

We use neutron resonance spin echo and Larmor diffraction to study the effect of uniaxial pressure on the tetragonal-to-orthorhombic structural (Ts) and antiferromagnetic (AF) phase transitions in iron pnictides BaFe2−xNixAs2 (x = 0,0.03,0.12), SrFe1.97Ni0.03As2 ,a nd BaFe 2(As0.7P0.3)2. In antiferromagnetically ordered BaFe2−xNixAs2 and SrFe1.97Ni0.03As2 with TN and Ts (TN Ts), a uniaxial pressure necessary to detwin the sample also increases TN , smears out the structural transition, and induces an orthorhombic lattice distortion at all temperatures. By comparing temperature and doping dependence of the pressure induced lattice parameter changes with the elastoresistance and nematic susceptibility obtained from transport and ultrasonic measurements, we conclude that the in-plane resistivity anisotropy found in the paramagnetic state of electron underdoped iron pnictides depends sensitively on the nature of the magnetic phase transition and a strong coupling between the uniaxial pressure induced lattice distortion and electronic nematic susceptibility.

Spin anisotropy due to spin-orbit coupling in optimally hole-doped Ba0.67K0.33Fe2As2

We use polarized inelastic neutron scattering to study the temperature and energy dependence of spin space anisotropies in the optimally hole-doped iron pnictide Ba

Uniaxial pressure effect on the magnetic ordered moment and transition temperatures in BaFe2-xTxAs2 ( T=Co,Ni )

_{0.67}

Electronic nematic correlations in the stress-free tetragonal state of BaFe2−xNixAs2

K

Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2As2

_{0.33}

Direct observation of magnon-phonon coupling in yttrium iron garnet

Fe

Electronic nematic correlations in the stress free tetragonal state of BaFe

_{2}

_{2-x}

As

Ni

_{2}

_{x}

(