Experimental elucidation of the origin of the ‘double spin resonances’ in Ba(Fe1-xCox)2As2

Wang, Meng; Yi, M.; Sun, H. L.; Valdivia, P.; Kim, M. G.; Xu, Z. J.; Berlijn, T.; Christianson, A. D.; Chi, Songxue; Hashimoto, M.; Lu, D. H.; Li, X. D.; Bourret-Courchesne, E.; Dai, Pengcheng; Lee, D. H.; Maier, T. A.; Birgeneau, R. J.

doi:10.1103/PhysRevB.93.205149

Title: Experimental elucidation of the origin of the ‘double spin resonances’ in $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$

Journal Article · Sun May 01 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.205149· OSTI ID:1393899

Wang, Meng ^[1]; Yi, M. ^[1]; Sun, H. L. ^[2]; Valdivia, P. ^[1]; Kim, M. G. ^[3]; Xu, Z. J. ^[1]; Berlijn, T. ^[4]; Christianson, A. D. ^[5]; Chi, Songxue ^[5]; Hashimoto, M. ^[6]; Lu, D. H. ^[6]; Li, X. D. ^[2]; Bourret-Courchesne, E. ^[3]; Dai, Pengcheng ^[7]; Lee, D. H. ^[8]; Maier, T. A. ^[4]; Birgeneau, R. J. ^[9]

Univ. of California, Berkeley, CA (United States). Dept. of Physics
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of High Energy Physics
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Sciences and Computer Science and Mathematics Division
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Synchrotron Radiation Lightsource
Rice Univ., Houston, TX (United States). Dept. of Physics and Astronomy
Univ. of California, Berkeley, CA (United States). Dept. of Physics; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division
Univ. of California, Berkeley, CA (United States). Dept. of Physics, Dept. of Materials Science and Engineering; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Materials Science Division

We report a combined study of the spin resonances and superconducting gaps for underdoped ( T _c = 19 K), optimally doped (T_c = 25 K), and overdoped (T_c = 19 K) Ba (Fe_{1 - x}Co _x) ₂ As ₂ single crystals with inelastic neutron scattering and angle resolved photoemission spectroscopy. We also find a quasi-two-dimensional spin resonance whose energy scales with the superconducting gap in all three compounds. In addition, anisotropic low energy spin excitation enhancements in the superconducting state have been deduced and characterized for the under and optimally doped compounds. Our data suggest that the quasi-two-dimensional spin resonance is a spin exciton that corresponds to the spin singlet-triplet excitations of the itinerant electrons. But, the intensity enhancements of the anisotropic spin excitations are dominated by the out-of-plane spin excitations of the ordered moments due to the suppression of damping in the superconducting state. Thus we offer an interpretation of the double energy scales differing from previous interpretations based on anisotropic superconducting energy gaps and systematically explain the doping-dependent trend across the phase diagram.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC05-00OR22725; AC02-05-CH11231; AC03-76SF008; DMR-1308603; 1362219; AC02-05CH11231

OSTI ID:: 1393899

Alternate ID(s):: OSTI ID: 1254543; OSTI ID: 1439994

Journal Information:: Physical Review B, Vol. 93, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 12 works

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Strong spin resonance mode associated with suppression of soft magnetic ordering in hole-doped Ba1-xNaxFe2As2 Waßer, Florian; Park, Jitae T.; Aswartham, Saicharan npj Quantum Materials, Vol. 4, Issue 1 https://doi.org/10.1038/s41535-019-0198-4	journal	December 2019
Anisotropic resonance modes emerging in an antiferromagnetic superconducting state Waßer, F.; Lee, C. H.; Kihou, K. Scientific Reports, Vol. 7, Issue 1 https://doi.org/10.1038/s41598-017-10208-1	journal	September 2017
Neutron spin resonance in the 112-type iron-based superconductor Xie, Tao; Gong, Dongliang; Ghosh, Haranath arXiv https://doi.org/10.48550/arxiv.1803.00779	text	January 2018
Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials Korshunov, M. M. arXiv https://doi.org/10.48550/arxiv.1803.06736	text	January 2018
Strong Spin Resonance Mode associated with suppression of soft magnetic ordering in Hole-doped Ba1-xNaxFe2As2 Wasser, F.; Park, J. -T.; Aswartham, S. arXiv https://doi.org/10.48550/arxiv.1909.03046	text	January 2019

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Title: Experimental elucidation of the origin of the ‘double spin resonances’ in $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$