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Title: Study Magnetic Excitations in Doped Transition Metal Oxides Using Inelastic Neutron Scattering

Technical Report ·
DOI:https://doi.org/10.2172/1120539· OSTI ID:1120539
 [1]
  1. Univ. of Tennessee, Knoxville, TN (United States). Dept. of Physics and Astronomy
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Understanding the interplay between magnetism and superconductivity continues to be a “hot” topic in modern condensed matter physics. The discovery of high-temperature superconductivity in iron-based materials in 2008 provided an unique opportunity to compare and contrast these materials with traditional high-Tc copper oxide superconductors. Neutron scattering plays an important role in determining the dynamical spin properties in these materials. This proposal is a continuation of previous DOE supported proposal. This report summarizes the final progress we have made over from May 2005 till Aug. 2013. Overall, we continue to carry out extensive neutron scattering experiments on Fe-based materials, focusing on understanding their magnetic properties. In addition, we have established a materials laboratory at UT that has allowed us to grow these superconductors. Because neutron scattering typically demands a large amount of samples, by growing these materials in our own laboratory, we can now pursuit neutron scattering experiments over the entire electronic phase diagram, focusing on regions of interests. The material synthesis laboratory at UT was established entirely with the support of DOE funding. This not only allowed us to carry out neutron scattering experiments, but also permit us to provide samples to other US/International collaborators for studying these materials.

Research Organization:
Univ. of Tennessee, Knoxville, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
DOE Contract Number:
FG02-05ER46202
OSTI ID:
1120539
Report Number(s):
DOE/ER/-46202
Country of Publication:
United States
Language:
English

References (10)

Evidence of a Spin Resonance Mode in the Iron-Based Superconductor Ba 0.6 K 0.4 Fe 2 As 2 from Scanning Tunneling Spectroscopy journal May 2012
Antiferromagnetic order and superlattice structure in nonsuperconducting and superconducting Rb y Fe 1.6 + x Se 2 journal September 2011
Uniaxial pressure effect on structural and magnetic phase transitions in NaFeAs and its comparison with as-grown and annealed BaFe 2 As 2 journal May 2013
Spin pairing and penetration depth measurements from nuclear magnetic resonance in NaFe 0.975 Co 0.025 As journal May 2013
Strong-coupling superconductivity in NaFe 1 − x Co x As: Validity of Eliashberg theory journal April 2013
Electron-doping evolution of the low-energy spin excitations in the iron arsenide superconductor BaFe 2 − x Ni x As 2 journal May 2010
Observation of a ubiquitous three-dimensional superconducting gap function in optimally doped Ba0.6K0.4Fe2As2 journal January 2011
Three-dimensionality of band structure and a large residual quasiparticle population in Ba 0 . 67 K 0 . 33 Fe 2 As 2 as revealed by c -axis polarized optical measurements journal April 2011
Antiferromagnetic spin excitations in single crystals of nonsuperconducting Li 1 − x FeAs journal June 2011
Effect of the in-plane magnetic field on the neutron spin resonance in optimally doped FeSe 0 . 4 Te 0 . 6 and BaFe 1 . 9 Ni 0 . 1 As 2 superconductors journal July 2011

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
magnetism
superconductivity