prof. dr. Catherine (Katia) Pappas

Katia joined 2009 Delft University of Technology to lead the section Neutron and Positron Methods in Materials (NPM2), within the Faculty of Applied Sciences. Her field of expertise is in neutron scattering science and techniques, with focus on high-resolution (neutron spin echo) spectroscopy and polarized neutrons. Besides neutron instrumentation, her scientific interests are in the field of magnetism and chiral magnetism, and the topical field of skyrmions.

Before Delft Katia spent several years at the Hahn-Meitner Institute – nowadays Helmholtz Zentrum Berlin – where she was involved in numerous large scale neutron instrumentation projects. She was deputy director of the Berlin Neutron Scattering Center and head of the "Neutron Instruments and Methods" department. Once in Delft, she was again the initiator of several big instrumentation projects, such as the neutron powder diffractometer PEARL or the multipurpose instrument LARMOR, a Dutch-UK collaboration, which is being built at the UK neutron source ISIS and is supported by a NWO-Groot grant. 

prof.dr. Katia Pappas

Neutron & Positron Methods for Materials

Publications PURE

Short CV

2009 – now: Full professor and Group leader “Neutron and Positron Methods in Materials”, Faculty of Applied Sciences, Delft University of Technology

1991 – 2009: Department of “Neutron Instruments and Methods” at Hahn-Meitner-Institut Berlin, Germany, since 2007 acting head of the department and deputy director of BENSC.

1986 – 1991: Post-Doc Hahn-Meitner-Institut Berlin, Germany (prof. F. Mezei)

1985 – 1986: Dowel Schlumberger Laboratories, France

1984 – 1985: Post-Doc FU Berlin, Germany (prof. K. Baberschke)

1979 – 1984: Doctorat ès Sciences, Université Paris Sud (Paris XI), France: “Etude magnétique des composés isolants frustrés et désordonnés CsMnFeF6 et CsNiFeF6 â€“ Relations avec les verres de spin” (dr. J. Hammann and prof. A. Fert) 

1977 – 1979: Doctorat de Troisième Cycle, Université Pierre et Marie Curie (Paris VI), France: “Symétrie de champ cristallin et interactions magnétiques dans les alliages amorphes Terre Rare – Argent” (Dr. B. Boucher and prof. A. Authier)

1976 -1977: D.E.A. de Sciences des Matériaux, Université Pierre et Marie Curie (Paris VI), France

1972 – 1976: Physics Diploma, Athens University, Greece

Recent Publications

  • Multiple low-temperature skyrmionic states in a bulk chiral magnet; Bannenberg L.J., Wilhelm H., Cubitt R., Labh A., Schmidt M.P., Lelièvre-Berna E., Pappas C., Mostovoy M., Leonov A.O.; npj Quantum Materials 4, 11 (2019) 
  • Magnetization and ac susceptibility study of the cubic chiral magnet Mn1- xFexSi; Bannenberg, L. J., Weber, F., Lefering, A. J. E., Wolf, T., Pappas C.; Phys. Rev. B  98, 184430 (2018)

  • Evolution of helimagnetic correlations in Mn1-xFexSi with doping: A small-angle neutron scattering study; Bannenberg, L. J., Dalgliesh, R. M., Wolf, T., Weber F., Pappas C.; Phys. Rev. B,  98, 184431 (2018)

  • 1.5 GPa compact double-wall clamp cell for SANS and NSE studies at low temperatures and high magnetic fields;  Sadykov, R., Pappas, C., Bannenberg, L. J., Dalgliesh, R. M.; Falus, P.; Goodway, C.; Lelièvre-Berna, E.; Journal of Neutron Research 20, 25 (2018) 

  • New magnetic phase of the chiral skyrmion material Cu2OSeO3; Qian F. Bannenberg  L. J,  Wilhelm H., Chaboussant G., Debeer-Schmitt L. M., Schmidt M. P., Aqeel A., Palstra T. T. M., Brück E., Lefering A. J. E., Pappas C., Mostovoy M.,  Leonov A. O.; Sci. Adv. 4, eaat7323 (2018)
  • Spin textures induced by quenched disorder in a reentrant spin glass: Vortices versus “frustrated” skyrmions; Mirebeau I.,Martin N.,Deutsch M., Bannenberg L. J., Pappas C.,  Chaboussant G., Cubitt R., Decorse C., Leonov A.O.; Phys. Rev. B 98, 014420 (2018)
  • Magnetic Fluctuations, Precursor Phenomena, and Phase Transition in MnSi under a Magnetic Field; Pappas C., Bannenberg L. J., Lelièvre-Berna E., Qian F., Dewhurst C. D., Dalgliesh R. M., Schlagel D. L., Lograsso T. A., and Falus P.; 
 Phys. Rev. Lett. 119, 182 (2017).
  • Universality of the helimagnetic transition in cubic chiral magnets: Small angle neutron scattering and neutron spin echo spectroscopy studies of FeCoSi; Bannenberg, L. J., Kakurai K., Falus P., Lelièvre-Berna E., Dalgliesh R. Dewhurst C. D., Qian F, Onose Y., Endoh Y., Tokura Y,. Pappas C.; Phys Rev B 95, 144433 (2017).

  • Magnetic relaxation phenomena in the chiral magnet Fe1-xCoxSi : An ac susceptibility study; Bannenberg L. J., Lefering A. J. E., Kakurai K., Onose Y., Endoh Y., Tokaura Y., and Pappas C; Phys Rev B 94, 134433 (2016). 
  • Extended skyrmion lattice scattering and long-time memory in the chiral magnet Fe1−xCoxSi; Bannenberg, L. J., Kakurai K., Qian F., Lelièvre-Berna E, Dewhurst C. D., Onose Y., Endoh Y., Tokura Y. and Pappas C.
; Phys Rev B 94, 104406 (2016)
  • Phase diagram and magnetic relaxation phenomena in Cu2OSeO3; Qian F., Wilhelm H., Aqeel A., Palstra T. T. M., Lefering A. J. E., Brück E. H. and Pappas C.; Phys Rev B 94, 064418 (2016) .
  • From nanopores to macropores: Fractal morphology of graphite Zhou, Z., Bouwman W. G, Schut H., Desert S., Jestin J., Hartmann S., Pappas C.; Carbon 541–547 (2016). 
  • Quasielastic neutron scattering experiment on water using TOFLAR (Time Of Flight and LARmor precession) technique at SNS; A. Kusmin, L. van Eijck, C. Pappas, P. A. Zolnierczuk, N. Arend, M. Ohl and A. A. van Well, EPJ Web of Conferences 83, 03009 (2015).