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Keith M Taddei

K.M. Taddei

Keith M Taddei

PostDoctoral Research Associate

Bio

Keith M. Taddei received a B.S. in Physics from Lewis University where he performed undergraduate research building and characterizing open cavity infrared lasers. He then received his Ph.D. in Physics from Northern Illinois University where he held a joint position as a guest graduate researcher at Argonne National Laboratory in the Neutron and X-ray Scattering Group and received funding through a dissertation completion fellowship. His research focused on the synthesis and study via scattering techniques of iron-based superconductors.  As a postdoctoral associate at Oak Ridge National Laboratory (ORNL), he has continued to use neutron scattering to study quantum materials including multiferroics, low-dimensional systems and rare-earth magnetism.  He currently leads a collaboration to investigate an exotic family of quasi-one-dimensional superconducting materials to understand how incipient orders lead to unconventional superconductivity. He helps operate and support the High Flux Isotope Reactor’s neutron powder diffractometer instrument HB-2A. Dr. Taddei is a member of the APS, ACA, PDS, NSSA, Sigma Xi and is the current secretary of ORNL’s post graduate association.  

Awards

2016 Outstanding Graduate Student Award - Physics (Northern Illinois University)

2016 Dissertation Completion Fellowship (Northern Illinois University)

2015 American Crystallographic Association Margaret Etter Student Lecturer Award

Publications

K.M. Taddei, Q. Zheng, A.S. Sefat, C. de la Cruz. “Coupling of structure to magnetic and superconducting orders in quasi-one-dimensional K2Cr3As3” Phys. Rev. B. Rapid Comm. 96, 180506(R) (2017)

B.A. Frandsen, K.M. Taddei, M. Yi, A. Frano, Z. Guguchia, R. Yi, Q. Si, D.E. Bugaris, R. Stadel, R. Osborn, S. Rosenkranz, O. Chmaissem, R.J. Birgeneau. “Local orthorhombicity in the magnetic C4 phase of the hole-doped iron-arsenide superconductor Sr1-xNaxFe2As2.” Phys. Rev. Lett. 119, 187001 (2017).

N. Sangeneni, K.M. Taddei, N. Bhat, S.A. Shivashankar. “Magnetic Properties of superparamagnetic, nanocrystalline cobalt ferrite thin films deposited at low temperature.” IEEE Transactions on Magnetics - submitted

K.M. Taddei, J.M. Allred, D.E. Bugaris, S.H. Lapidus, M.J. Krogstad, H. Claus, D.Y. Chung, M.G. Kanatzidis, R. Osborn, S. Rosenkranz, O. Chmaissem. “Observation of the magnetic C4 phase in Ca1-xNaxFe2As2 and its universality in the hole-doped 122 superconductors”  Phys. Rev. B 95, 064508 (2017)

J.M. Allred, K.M. Taddei, D.E. Bugaris, M.J. Krogstad, S.H. Lapidus, D.Y. Chung, H. Claus, M.G. Kanatzidis, D.E. Brown, J. Kang, R.M. Fernandes, I. Eremin, S. Rosenkranz, O. Chmaissem, R. Osborn, “Double-Q spin-density wave in iron arsenide superconductors.”  Nature Phys. DOI: 10.1038/NPHYS3629 (2016)

K.M. Taddei, J.M. Allred, D.E. Bugaris, M.J. Krogstad, S.H. Lapidus, D.Y. Chung, R. Stadel, M.G. Kanatzidis, D.E. Brown, S. Rosenkranz, R. Osborn, O. Chmaissem. “Detailed magnetic and structural analysis mapping a robust magnetic C4 dome in Sr1-xNaxFe2As2”  Phys. Rev. B 93, 134510 (2016)

S. Jiang, C. Liu, H. Cao, T. Birol, J.M. Allred, W. Tian, L. Liu, K. Cho, M.J. Krogstad, J. Ma, K.M. Taddei, M.A. Tanatar, M. Hoesch, R. Prozorov, S. Rosenkranz, Y.J. Uemura, G. Kotliar, N. Ni. “The structural/magnetic phase transitions in Ca0.73La0.27FeAs2 with electron overdoped FeAs layers” Phys. Rev. B 93, 174413 (2016) 

M.P. Smylie, M. Leroux, V. Mishra, L. Fang, K.M. Taddei, O. Chmaissem, H. Claus, A. Kayani, A. Snezhko, U. Welp, W.K. Kwok, “Effect of proton irradiation on superconductivity in optimally doped BaFe2(As1-xPx)2 single crystals.” Phys. Rev. B 93, 115119 (2016)

J.M. Allred, S. Avci, D.Y. Chung, H. Claus, D.D. Khalyavin, P. Manuel, K.M. Taddei, M.G. Kanatzidis, S. Rosenkranz, R. Osborn, O. Chmaissem. “Tetragonal magnetic phase in Ba1-xKxFe2As2 from x-ray and neutron diffraction.” Phys. Rev. B 92, 094515 (2015).

K.M. Taddei, M. Struza, D.Y. Chung, H.B. Cao, H. Claus, M.G. Kanatzidis, R. Osborn, S. Rosenkranz,  O. Chmaissem, “Cesium vacancy ordering in phase-separated CsxFe2-ySe2.” Phys. Rev. B 92, 094505 (2015).

J.M. Allred, K.M. Taddei, D.E. Bugaris, S. Avci, D.Y. Chung, H. Claus, C. dela Cruz, M.G. Kanatzidis, S. Rosenkranz, R. Osborn, O. Chmaissem,  “Coincident structural and magnetic order in BaFe2(As1-xPx)2 revealed by high-resolution neutron diffraction.” Phys. Rev. B 90, 104513 (2014).

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