Neutron scattering studies of spin excitations in superconducting Rb0.82Fe1.68Se2

Journal Article · Sun Jan 01 00:00:00 EST 2012 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.86.024502· OSTI ID:1045259

Wang, Miaoyin ^[1]; Li, Chunhong ^[2]; Abernathy, Douglas L ^[3]; Song, Yu ^[1]; Carr, Scott V. ^[1]; Lu, Xiangye ^[2]; Li, Shiliang ^[2]; Yamari, Zahra ^[4]; Hu, Jiangping ^[5]; Xiang, Tao ^[2]; Dai, Pengcheng ^[1]

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1. University of Tennessee, Knoxville (UTK)
2. The Institute of Physics, Chinese Academy of Sciences
3. ORNL
4. Canadian Neutron Beam Centre, National Research Council, Chalk River Laboratorie
5. Purdue University and Chinese Academy of Sciences

We use inelastic neutron scattering to show that superconducting (SC) rubidium iron selenide Rb0.82Fe1.68Se2 exhibits antiferromagnetic (AF) spin excitations near the in-plane wave vector Q = ( ,0) identical to that for iron arsenide superconductors. Moreover, we find that these excitations change from incommensurate to commensurate with increasing energy and occur at the expense of spin waves associated with the coexisting 5 5 block AF phase. Since these spin excitations cannot come from Fermi surface nesting based on angle resolved photoemission experiments, our results indicate the presence of local moments in SC Rb0.82Fe1.68Se2 that may have a similar origin as the hourglass-like spin excitations in copper oxide superconductors.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source (SNS)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 1045259
• Journal Information: Physical Review B, Vol. 86, Issue 2; ISSN 1098-0121
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
COPPER OXIDES
FERMI LEVEL
IRON ARSENIDES
IRON SELENIDES
NEUTRONS
ORIGIN
PHOTOEMISSION
RUBIDIUM
SCATTERING
SPIN
SPIN WAVES
SUPERCONDUCTORS
VECTORS