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Prof André Strydom

Primary Expertise:
Physics of highly correlated matter
Secondary Expertise:
Magnetism of 4f-electron systems, low-temperature charge and spin ordering phenomena, and ground states of matter
NRF Rating:
Internationally acclaimed researcher
Faculty:
Faculty of Science
Campus:
APK


André M. Strydom is a Professor of Physics and Vice Dean of Research and Postgraduate Studies at the Faculty of Science, University of Johannesburg (UJ). He holds a PhD in Physics from the University of the Witwatersrand. In July 2014, Prof Strydom was awarded the Bernard Coqblin Prize at the International Conference on Strongly Correlated Electron Systems in Grenoble.

Recent Invited Talks

  • Title to be confirmed - New Frontiers through the Synergy of Quasicrystals and Strongly Correlated Electron Systems, symposium to be held in June 2019, Sendai, Japan.
  • Title to be confirmed - Euro Condensed Matter 2019, conference to be held in June 2019, Berlin.
  • High-temperature ordering in the compound Ce2Rh2Ga - International Conference on Solid Compounds of Transition Elements, Vienna, March/April 2018.
  • Unusual physical properties in the new system Ce2Rh2Ga - Physics Department, UJ, April 2018.
  • The cubic compound Yb3Rh4Ge13: an electronic soup of Cooper pairs, magnons, and spin composites - Physics Department, UJ, September 12, 2013.
  • Scales of interactions in strongly correlated electrons: a comparison of three cerium systems - International Conference on Strongly Correlated Electron Systems, Grenoble, France, July 11, 2014.
  • Superconductivity, magnetism, and atomic rattling phenomena in R3T4Ge13 with R=Y, Lu, Yb - 15th Czech and Slovak Conference on Magnetism, Kosice, Slovakia, June 20, 2013.
  • Non-Fermi liquid behaviour in the heavy-fermion Kondo lattice Ce2Rh3Al9 - International Conference on Quantum Fluids and Solids, Matsue, Japan, August 01, 2013.
  • Thermal transport in magnetic fields: case study of superconductivity in the skutterudites LaPt4Ge12 and PrPt4Ge12 - Institute of Physics of the Chinese Academy of Science, Beijing, April 16, 2013.
  • Electronic correlations in cubic structures: the fascination of high symmetry  - Institute of Physics of the Chinese Academy of Science, Beijing, April 25, 2013.


Experimental Facilities

  • Properties of matter: A suite of electronic transport, thermal transport, thermodynamic, Magnetic, and dilatometry measurement options are made possible by three experimental stations housed in our Laboratory of our Highly Correlated Matter Research Group in the Physics Department of the Science Faculty at the University of Johannesburg.
  • We have at our disposal facilities to achieve experimental variables in terms of experimental temperatures between 0.05 and 1000 Kelvin, and in applied magnetic fields up to 9 Tesla.
  • Various sample synthesis facilities exist for high-temperature intermetallic materials synthesis including stable and controlled temperature environments up to 2000 oC with in-situ vacuum or in-situ purified argon. 
  • Materials characterization include powder x-ray diffractometer. For single-crystal workour laboratory houses a facility for real-time Laue orientation and surveying of crystalline material by means of the Photovoltaik und Röntgen X-ray station with an x-ray area detector from Multiwire (see http://www.lauecamera.com/indexengl.htm and http://www/multiwire.com).
  • In the Faculty Central Analytical Facility we have access to a variety of materials characterization methods such x-ray fluorescence, scanning electron microscopy with energy dispersive elemental detection.
  • For our cryogenic facilities we operate a helium liquefier plant to recover helium gas, to purify the gas and to reproduce cryogenic fuel.

 

Current Collaborators

  • Prof Dr Frank Steglich; founding Director of the Max Planck Institute for Chemical Physics of Solids in Dresden, Germany.
  • Dr Michael Baenitz and coworkers, Senior Research Associate at MPI-CPfS. 
  • Prof Dr Silke Bühler-Paschen; Institute of Solid State Physics at the Technical University of Vienna, Austria, and co-workers.
  • Dr Devashibhai Adroja, Dr Adrian Hillier, and co-workers at the ISIS Pulsed Neutron and Muon Facility of the Science & Technology Facilities Council, England.
  • Prof Andrei Gippius, Physics Department, Moscow State University.
  • Prof Avinash Mahajan, Indian Institute of Technology, Bombay, India.
  • Prof Peijie Sun, Group Leader at the Institute of Physics, Chinese Academy of Science, Beijing.
  • Dr Pascale Deen, European Spallation Source in Lund, Sweden.
  • Prof Dr Marian Reiffers and co-workers of the Institute of Experimental Physics, Slovak Academy of Sciences, and the Faculty of Sciences, University of Prešov, Slovakia.
  • Prof Mauro Giovannini and coworkers, Dipartimento di Chimica e Chimica Industriale, University of Genova, Italy.
  • Dr Anna Tursina of the Department of Chemistry at Moscow State University. 
  • Prof MB Tchoula Tchokonté, Physics Department, University of the Western Cape, SA .
  • Prof HS Nair, Physics Department, University of Texas El Paso.
  • Prof Kaushik Mallick, Department of Chemistry, University of Johannesburg. 

 

Selected Publications

  • A Amorese, K Kummer, NB Brookes, O Stockert, DT Adroja, André M StrydomA Sidorenko, H Winkler, DA Zocco, A Prokofiev, S Paschen, MW Haverkort, LH Tjeng, and A Severing. Determining the local low-energy excitations in the Kondo semimetal CeRu4Sn6 using resonant in-elastic x-ray scattering. Physical Review B - Rapid Communications 98 (2018) 081116(R)/1–6.

  • A Bhattacharyya, DT Adroja, N Kase, AD Hillier, AM Strydom, and J Akimitsu. Unconventional superconductivity in the cage type compound Sc5Rh6Sn18, Physical Review B 98 (2018) 024511/1–6.

  • JG Sereni, I Curlık, M Giovannini, A Strydom, and M Reiffers. Physical properties of the magnetically frustrated very-heavy-fermion compound YbCu4Ni. Physical Review B 98 (2018) 094420/1–8.

 

  • F Weickert, L Civale, BA Maiorov, M Jaime, MB Salamon, E Carleschi, AM Strydom, R Fittipaldi, V Granata, and A Vecchione. Missing magnetism in Sr4Ru3O10: Indication for Antisymmetric Exchange Interaction. Nature Scientific Reports 7 3867 1–9 DOI:10.1038/s41598-017-03648-2.

 

  • J Zhang, S Hu, H Zhao, P Wang, AM Strydom, J Luo, F Steglich, and P Sun. Magnetotransport properties of CeRu2Al10: similarities to URu2Si2. Physical Review B 94 (2016) 235120/1–5.

 

  • A Bhattacharyya, DT Adroja, J Quintanilla, AD Hillier, N Kase, AM Strydom, and J Akimitsu. Broken time-reversal symmetry probed by muon spin relaxation in the caged type superconductor Lu5Rh6Sn18. Physical Review B Rapid Communications 91 (2015) 060503(R).


  • PY Portnichenko, AS Cameron, MA Surmach, PP Deen, S Paschen, A Prokofiev, J-M Mignot, AM Strydom, MTF Telling, A Podlesnyak, and DS Inosov. Momentum-space structure of quasielastic spin fluctuations in Ce3Pd20Si6. Physical Review B 91 (2015) 094412.


  • HS Nair, CMN Kumar, VY Pomjakushin, Y Xiao, T Chatterji, and AM Strydom. Spin-lattice coupling and frustrated magnetism in Fe-doped hexagonal LuMnO3. Europhysics Letters 110 (2015) 37007. 

  • P Sun, B Wei, J Zhang, JM Tomczak, AM Strydom, M Søndergaard, BB Iversen, and F Steglich. Large Seebeck effect by charge-mobility engineering. Nature Communications 6 (2015) 7475.

  • A Bhattacharyya, DT Adroja, N Kase, AD Hillier, J Akimitsu, and AM Strydom. Unconventional superconductivity in Y5Rh6Sn18 . Nature Scientific Reports 5 (2015) 12926

 

  • P Khuntia, P Peratheepan, AM Strydom, Y Utsumi, K-T Ko, K-D Tsuei, LH Tjeng, F Steglich, and M. Baenitz. Contiguous 3d and 4f Magnetism: Strongly Correlated 3d Electrons in YbFe2Al10. Physical Review Letters 113 (2014) 216403.

 

  • A Bhattacharyya, DT Adroja, AM Strydom, J Kawabata, T Takabatake, AD Hillier, V Garcia Sakai, JW Taylor, and RI Smith. Contrasting carrier doping effects in the Kondo insulator CeOs2Al10: The influential role of c-f hybridization in spin-gap formation. Physical Review B 90 (2014) 174422.

 

  • A Bhattacharyya, DD Khalyavin, DT Adroja, AM Strydom, AD Hillier, P Manuel, T Takabatake, JW Taylor, and C Ritter. Anomalous change of the magnetic moment direction by hole doping in CeRu2Al10. Physical Review B 90 (2014) 174412.

 

  • A Bhattacharyya, DT Adroja, AM Strydom, AD Hillier, JW Taylor, A Thamizhavel, SK Dhar, WA Kockelmann and BD Rainford. μSR and inelastic neutron scattering investigation of the noncentrosymmetric antiferromagnet CeNiC2. Physical Review B 90 (2014) 054405.

 

  • M Smidman, AD Hillier, DT Adroja, MR Lees, VK Anand, RP Singh, RI Smith, DM Paul and G Balakrishnan. Investigation of the superconducting states of noncentrosymmetric LaPdSi3 and LaPtSi3Physical Review B 89 (2014) 094509.

 

  • VK Anand, D Britz, A Bhattacharyya, DT Adroja, AD Hillier, AM Strydom, W Kockelmann, BD Rainford and KA McEwen. Physical properties of the noncentrosymmetric superconductor LaIrSi3: A μSR study. Physical Review B 90 (2014) 014513.

 

  • DD Khalyavin, DT Adroja, A Bhattacharyya, AD Hilier, P Manuel, AM StrydomJ Kawabata, and T Takabatake. Magnetic ordering with reduced cerium moments in hole-doped CeOs2Al10. Physical Review B 89 (2014) 064422/1-5.

 

  • SC Ray, N Soin, T Makgato, CH Chuang, WF Pong, SS Roy, SK Ghosh, AM Strydomand JA McLaughlin. Graphene supported graphene/graphane bilayer nanostructure materials for spintronics. Nature Scientific Reports 4 (2014) 3862/1-7.

 

  • DT Adroja, AD Hillier, Y Muro, T Takabatake, AM Strydom, A Bhattacharyya, A Daoud-Aladin, and JW Taylor. muSR and inelastic neutron scattering investigations of the caged type Kondo semimetals: CeT2Al10 (T=Fe, Ru, Os). Physica Scripta 88 (2013) 068505-068525.

 

  • DD Khalyavin, DT Adroja, P Manuel, J Kawabata, K Umeo, T Takabatake, and AM Strydom. Change of magnetic ground state by light electron doping in CeOs2Al10. Physical Review B 88 (2013) 060403(R).

 

  • DT Adroja, AD Hillier, Y Muro, J Kajino, T Takabatake, P Peratheepan, AM StrydomPP Deen, F Demmel, JR Stewart, JW Taylor, RI Smith, S Ramos, and MA Adams. Competing 4f-electron dynamics in Ce(Ru1-xFex)2Al10 (0<x<1.0): Magnetic order emerging from the Kondo semiconducting state. Physical Review B 87 (2013). 224415/1-13.

 

  • K Mallick, and AM Strydom. Biophilic Carbon nanotubes. Colloids and Surfaces B: Biointerfaces 105 (2013) 310

 

  • V Guritanu, P Wissgott, T Weig, H Winkler, J Sichelschmidt, M Scheffler, A Prokofiev, S Kimura, T Iizuku, AM Strydom, M Dressel, F Steglich, K Held, and S Paschen . Anisotropic optical conductivity of the putative Kondo insulator CeRu4Sn6. Physical Review B 87 (2013) 115129/1-4.

 

  • J Custers, K-A Lorenzer, M Müller, A Prokofiev, A Sidorenko, H Winkler, AM StrydomY Shimura, T Sakakibara, R Yu, Q Si, and S Paschen. Destruction of the Kondo effect in cubic heavy fermion compound Ce3Pd20Si6. Nature Materials 11 (2012) 189

 

  • P Khuntia, AM Strydom, LS Wu, MC Aronson, F Steglich, and M Baenitz. Field tuned critical fluctuations in YFe2Al10: Evidence from magnetization and  27Al NMR and NQR investigations. Physical Review B 86 (2012) 220401(R).

 

  • JA Mydosh, AM Strydom, M Baenitz, B Chevalier, W Hermes, and R Pöttgen. Hysteretic behaviour and magnetic ordering in CeRuSnPhysical Review B 83 (2011) 054411.


  • VK Anand, AD Hillier, DT Adroja, AM Strydom, H Michor, KA McEwen, and BD Rainford. Specific heat and mSR study on the noncentrosymmetric superconductor LaRhSi3. Physical Review B 83 (2011) 064522.

 

  • AM Strydom and P Peratheepan. Magnetism and electronic correlations in the iron aluminides RFe2Al10 (R=Y, Yb). Physica Status Solidi – Rapid Research Letters 4 (2010) 356. 

 

  • DD Khalyavin, AD Hillier, DT Adroja, AM Strydom, P Manuel, LC Chapon, P Peratheepan, K Knight, P Deen, C Ritter, Y Muro, and T Takabatake. Long-range magnetic order in CeRu2Al10 studied via muon spin relaxation and neutron diffraction. Physical Review B 82 (2010) 100405.

 

  • DT Adroja, AD Hillier, PP Deen, AM Strydom, Y Muro, J Kajino, WA Kockelmann, T Takabatake, VK Anand, JR Stewart, and J Taylor. Long-range ordering of reduced magnetic moments in the spin-gap compound CeOs2Al10 as seen via muon spin relaxation and neutron scattering. Physical Review B 82 (2010) 104405.

 

  • EM Brüning, M Brando, M Baenitz, A Bentien, AM Strydom, RE Walstedt, and F Steglich . Low-temperature properties of CeRu4Sn6 from NMR and specific heat measurements: Heavy fermions emerging from a Kondo-insulating state. Physical Review B 82 (2010) 125115.

 

  • PP Deen, AM Strydom, S Paschen, DT Adroja, W Kockelmann, and S RolsQuantum fluctuations and the magnetic ground state of Ce3Pd20Si6. Physical Review B 81 (2010) 064427.


  • D. Britz and A. M. Strydom. On the Antiferromagnetic Superconductor YbPd2Sn: The case for Local-Moment Quantum Criticality. Journal of Low Temperature Physics, DOI 10.1007/s10909-014-1225-2. 

 

  • AM Strydom. Thermal and electronic transport in CeRu2Al10: Evidence for a metal-insulator transition. Physica B 404 (2009) 2981.

Publications