Paramagnetic spin excitations in insulating Rb0.8Fe1.6Se2

Autor:	Pengcheng Dai, Chun-Hong Li, Xingye Lu, Miaoyin Wang, Scott V. Carr, Rui Zhang, Russell A. Ewings, Yu Song, Leland Harriger
Rok vydání:	2013
Předmět:	Physics Condensed matter physics Mott insulator Electron Neutron scattering Condensed Matter Physics Electronic Optical and Magnetic Materials Neutron spectroscopy Paramagnetism Spin wave Antiferromagnetism Condensed Matter::Strongly Correlated Electrons Atomic physics Néel temperature
Zdroj:	Physical Review B. 87
ISSN:	1550-235X 1098-0121
DOI:	10.1103/physrevb.87.064409
Popis:	We use neutron scattering to study temperature-dependent spin excitations in insulating antiferromagnetic (AF) Rb0.8Fe1.6Se2. In the low-temperature AF state, spin waves can be accurately described by a local moment Heisenberg Hamiltonian. On warming to around the Neel temperature of T-N = 500 K, low-energy (E 50 meV) spin excitations become heavily damped. Upon further warming to above the structural distortion temperature of T-s = 524 K, the entire paramagnetic excitations become overdamped. These results suggest that AF Rb0.8Fe1.6Se2 is not a copper-oxide-like Mott insulator and has less electron correlations compared with metallic iron pnictides and iron chalcogenides. DOI: 10.1103/PhysRevB.87.064409
Databáze:	OpenAIRE
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