A Triplet Resonance in Superconducting Fe$_{1.03}$Se$_{0.4}$Te$_{0.6}$
Juanjuan Liu1, A. T. Savici2, G. E. Granroth2, K. Habicht3, Y. Qiu4,5, Jin Hu6, Z. Q. Mao7, Wei Bao1**
1Department of Physics, Renmin University of China, Beijing 100872 2Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA 3Helmholtz-Zentrum Berlin für Materialen und Energy, Berlin D-14109, Germany 4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA 5Department of Materials Science and Engineering, University of Maryland, College Park, MD 20742, USA 6Department of Physics, University of Arkansas, Fayetteville, AR 72701, USA 7Department of Physics, Pennsylvania State University, University Park, PA 16802, USA
Abstract：From heavy fermion compounds and cuprates to iron pnictides and chalcogenides, a spin resonance at $\hbar{\it \Omega}_0\propto k_{\rm B}T_{\rm c}$ is a staple of nearly magnetic superconductors. Possible explanations include a two-particle bound state or loss of magnon damping in the superconducting state. While both scenarios suggest a central role for magnetic fluctuations, distinguishing them is important to identify the right theoretical framework to understand these types of unconventional superconductors. Using an inelastic neutron scattering technique, we show that the spin resonance in the optimally doped Fe$_{1.03}$Se$_{0.4}$Te$_{0.6}$ superconductor splits into three peaks in a high magnetic field, a signature of a two-particle $S=1$ triplet bound state.
(Magnetic properties including vortex structures and related phenomena)
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. [J]. 中国物理快报, 2018, 35(12): 127401-127401.
Juanjuan Liu, A. T. Savici, G. E. Granroth, K. Habicht, Y. Qiu, Jin Hu, Z. Q. Mao, Wei Bao. A Triplet Resonance in Superconducting Fe$_{1.03}$Se$_{0.4}$Te$_{0.6}$. Chin. Phys. Lett., 2018, 35(12): 127401-127401.
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2018, Vol. 35 
