Ben Mallett

BSc(Hons), PhD in Physics Victoria University of Wellington

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Research Fellow

Biography

After trying his hand at philosophy, Ben graduated with Ph.D. in physics from Victoria University of Wellington under the supervision of Prof. Jeffery Tallon. He then undertook postdoctoral research in the group of Prof. Christian Bernhard at Fribourg University in Switzerland. In 2016 he returned to New Zealand and is currently is a Rutherford Postdoctoral Research Fellow at the University of Auckland, and based in the Photon Factory there. Ben’s research interests orbit around novel physics in solids and using spectroscopy to understand it. Ben is an active member of the Faculty of Science Post-doctoral Society at the University of Auckland, which supports fellow early-career researchers, and he is regularly involved in science outreach activities.

Research | Current

My research interests lie in the field of experimental solid-state physics, in particular the physics of complex superconductors, magnetic materials and the emergent properties of thin-film multilayers. The latter topic is my current focus, studying what I’ve dubbed ‘Superconductor Sandwiches’ – thin-film multilayers of a superconductor and a magnetic material. We discovered that these systems have a new, tuneable ground-state due to an interaction between the superconductor and specific properties of the magnetic material grown on top. We believe it’s a ‘granular’ superconducting state. Remarkably, they also display magnetic-field induced superconducting coherence – one of only five known cases in the 103 year history of superconductors, and unique amongst high-temperature superconductors. This an effect which results from a novel, as yet unknown mechanism!

To undertake my research, I use techniques appropriate for the physics questions at hand (but I do have a real soft spot for[BM1]  infrared and optical spectroscopy) and I regularly make use of synchrotrons and other large-scale user facilities.

 [BM1]Specific interest??

 [BM2]Is this an agreed acronym the University uses widely?

Distinctions/Honours

Rutherford Post-Doctoral Fellow

Swiss Embassy International Scholarship

Areas of expertise

Condensed matter physics

Optical spectroscopies applied to solids

Committees/Professional groups/Services

Faculty of Science Post-Doctoral Society

Colloquia organiser for the Department of Physics

Selected publications and creative works (Research Outputs)

  • Perret, E., Monney, C., Johnston, S., Khmaladze, J., Lyzwa, F., Gaina, R., ... Mallett, B. P. P. (2018). Coupled Cu and Mn charge and orbital orders in YBa2Cu3O7/Nd-0.65(Ca1-ySry)(0.35)MnO3 multilayers. COMMUNICATIONS PHYSICS, 110.1038/s42005-018-0046-z
  • Baldini, E., Kubacka, T., Mallett, B. P. P., Ma, C., Koohpayeh, S. M., Zhu, Y., ... Carbone, F. (2018). Lattice-mediated magnetic order melting in. Physical Review B, 97 (12).10.1103/PhysRevB.97.125149
    URL: http://hdl.handle.net/2292/43046
  • Mallett, B. P. P., Marsik, P., Khmaladze, J., Arul, R., Minola, M., Simpson, M. C., & Bernhard, C. (2018). Superconductor sandwiches: Cuprate-manganite multilayers with a remarkable new ground state. Proceedings of SPIE - The International Society for Optical Engineering. 10.1117/12.2289215
  • Perret, E., Sen, K., Khmaladze, J., Mallett, B. P. P., Yazdi-Rizi, M., Marsik, P., ... de Andrés Prada R (2017). Structural, magnetic and electronic properties of pulsed-laser-deposition grown SrFeO_{3-δ} thin films and SrFeO_{3-δ}/La_{2/3}Ca_{1/3}MnO_{3} multilayers. Journal of Physics Condensed Matter, 29 (49)10.1088/1361-648X/aa93a6
    URL: http://hdl.handle.net/2292/42381
  • Yazdi-Rizi, M., Marsik, P., Mallett, B. P. P., Sen, K., Cerreta, A., Dubroka, A., ... Bernhard, C. (2017). Infrared ellipsometry study of photogenerated charge carriers at the (001) and (110) surfaces of SrTiO3 crystals and at the interface of the corresponding LaAlO3/SrTiO3 heterostructures. Physical Review B, 95 (19).10.1103/PhysRevB.95.195107
    URL: http://hdl.handle.net/2292/35246
  • Baldini, E., Chiodo, L., Dominguez, A., Palummo, M., Moser, S., Yazdi-Rizi, M., ... Magrez, A. (2017). Strongly bound excitons in anatase TiO2 single crystals and nanoparticles. Nature Communications, 8 (1), 13-13. 10.1038/s41467-017-00016-6
    URL: http://hdl.handle.net/2292/35244
  • Mallett, B. P. P., Wang, C. N., Marsik, P., Sheveleva, E., Yazdi-Rizi, M., Tallon, J. L., ... Bernhard, C. (2017). Muon spin rotation and infrared spectroscopy study of magnetism and superconductivity in Ba₁₋ₓKₓFe₂As₂. Physical Review B, 95 (5)10.1103/PhysRevB.95.054512
    URL: http://hdl.handle.net/2292/35237
  • Yazdi-Rizi, M., Marsik, P., Mallett, B. P. P., & Bernhard, C. (2017). Anisotropy of infrared-active phonon modes in the monodomain state of tetragonal SrTiO(3) (110). Physical Review B, 95 (2).10.1103/PhysRevB.95.024105
    URL: http://hdl.handle.net/2292/35263

Identifiers

Contact details

Primary office location

SCIENCE CENTRE 302 - Bldg 302
23 SYMONDS ST
AUCKLAND 1010
New Zealand

Web links