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Connections among crystal chemistry, disorder and critical temperature Tc have been at the forefront of superconductivity, one of the most widely studied phenomena in physics, chemistry and materials science alike. In Fe-based superconductors Tc correlates with the average anion height above the Fe plane, i.e. with the geometry of the FeAs4 or FeCh4 (Ch = Te, Se, S) tetrahedron. By synthesizing FeSe1−xSx (0 ≤ x ≤ 1) single crystal alloys with atomic defects we find that their Tc is not correlated with the anion height of other Fe superconductors. Instead, changes in Tc(x) and tetragonal-to-orthorombic (nematic) transition Ts(x) on cooling are correlated with Bragg plane and Fe vibrations disorder in direction orthogonal to Fe planes and thereby induced scattering rates (1/τ) (x) [1,2]. The disorder stems from deformed Fe (Se, S)4 tetrahedra with different Fe-Se and Fe-S bond distances. Moreover, high-temperature metallic resistivity in the region of strong disorder exceeds Mott limit and provides an example of the strong violation of Matthiesen’s rule and Mooij law which is known to be a dominant when adding moderate disorder past the Drude/Matthiassen’s regime in all materials [2]. Scattering mechanism of Mott limit-exceeding resistivity is unrelated to phonons and arises for strong Se/S atom disorder in tetrahedral surrounding of Fe. Observations point to intricate connection between nanostructure details and unconventional scattering mechanism, possibly related to charge-nematic or magnetic spin fluctuations [2,3].
References
[1] Aifeng Wang et al., Inorg. Chem. 61, 11036 (2022).
[2] Aifeng Wang et al., Nano Lett. 22, 6900 (2022).
[3] Yu Liu et al., Nanoscale Horizons 10, 59 (2023).
Education:
September 2000: Ph. D. degree in Physics, Florida State University, NHMFL Tallahassee, FL
December 1997: M. Sc. degree in Physics, Florida State University, Tallahassee, FL
August 1996: B. Sc. degree in Theoretical Physics, University of Belgrade, Serbia
Employment and research activities:
2023.10 - present: Shanghai Advanced Research in Physical Sciences Shanghai, China
2023.09 - present: Vinca Institute of Nuclear Sciences, Belgrade, Serbia
2002.10 - 2023.09: Condensed Matter Physics and Materials Science Department, Brookhaven National Laboratory (BNL), Upton NY USA
In charge of establishing and leading exploratory materials/crystals growth and characterization lab
2008 - present: Physicist with tenure, Condensed Matter Physics and Materials Science Department,
2006 - 2008: Physicist, Condensed Matter Physics and Materials Science Department,
2004 - 2006: Associate Physicist, Condensed Matter Physics and Materials Science Department,
2002 - 2003: Assistant Physicist, Physics Department, Brookhaven National Laboratory
2016- present: Adjunct Professor of Materials Science, Materials Science and Engineering, Stony Brook University, Stony Brook USA
2012 - present: Visiting professor of Physics, Department of Physics, University of Belgrade, Serbia
2011 - 2014: Alexander von Humboldt Fellow, Hochfeld Magnetlabor Dresden, HZDR
2010 - present: Adjunct Professor of Physics, Department of Physics and Astronomy, Stony Brook University, Stony Brook USA
2009 - present: Adjunct Professor of Physics, Department of Physics and Astronomy, Johns Hopkins University, Baltimore MD USA
2008 - 2019: Foreign Associate Member, Canadian Institute for Advanced Research (CIFAR), Quantum Materials Program, Toronto ON, Canada
2007 - 2009: Adjunct Assistant Professor of Physics, Department of Physics and Astronomy, Johns Hopkins University, Baltimore MD USA
2008 (April - July): Visiting Professor of Physics, ISSP, University of Tokyo, Japan
2000 - 2002: Postdoc, Condensed Matter Physics, Ames Laboratory, Iowa State University
1997 - 2000: Graduate Research Assistant, NHMFL Tallahassee & MST-10 Group, LANL
Awards:
“Marko Jaric” Serbian Physics award 2009
Humboldt Fellowship for Experienced Researchers 2011-2014
Serbian Academy of Sciences and Arts – Foreign Associate Member (2015-present)
APS Fellow 2016
BNL Science and Technology Award (2022)
Venue: TDLI Meeting Room N499
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