欧美福利100000

Prof. Giovanni Hearne

Professor
Name: Giovanni Hearne
Location: C1 Lab 129 Auckland Park Kingsway Campus
Physics Academic Staff听 Staff Members

Contact Details:
Tel: 011 559 3849

Email:听grhearne@uj.ac.za

About Prof. Giovanni Hearne

Fields of Specialisation:听Materials Science, Solid State Physics Condensed Matter, Physics.

NRF rating:听B2

Research interests

Experimental Condensed听 Matter Physics. 57Fe M枚ssbauer-effect spectroscopy at variable cryogenic temperatures (down to 1.5 K) and high pressures (up to one megabar).听 High pressure physics (diamond- and gem- anvil cells, DACs and GACs).听 Laser spectroscopy, XRD, electrical-transport and synchrotron-based techniques (XAS), at high pressures. CO2 laser heating in DACs. Lattice-dynamics,听 superconductivity, magnetism , magnetic-electronic (insulator-metal and听 spin-state) transitions (in strongly correlated electron systems SCES), materials science. Instrumentation physics (electronics). Participation in听 numerous research projects pertaining to applied, industrial and bio-molecular physics. 197Au (gold) M枚ssbauer-effect spectroscopy. For information on Prof G. Hearne’s research interest, please click on this link.

Recent Research outputs

1. 鈥淚nterplay between H-bonding proton dynamics and Fe valence fluctuations in Fe3(PO4)2(OH)2 at high pressure鈥� G. Hearne, V. Ranieri, P. Hermet, J. Haines, O. Cambon, J.L. Bantignies, P. Fertey,
   T. Stuerzer, M. Poienar, J. Rouquette Phys. Rev. B 107, (2023) L060302 (1-8)
2. 鈥淓ffects of light-ion low-fluence implantation on the pressure response of double-walled carbon nanotubes鈥�
   G. R. Hearne, L. Kapesi, R. M. Erasmus, S. R. Naidoo, and R. Warmbier
   Phys. Rev. Materials 5, (2021), 033607 (1-11)
3. 鈥淧ressure-Induced Spin Crossover at Room Temperature in a Nanoporous Host-Guest Framework Structure鈥�
   Banele Vatsha, Rowan Goliath, and Giovanni Hearne
   ChemPlusChem 86, (2021), 82鈥�86
   Also selected as a Cover Feature (CHEMPLUSCHEM 1/21)
   (see https://0-doi-org.ujlink.uj.ac.za/10.1002/cplu.202000705)
4. 鈥淚nterplay between valence fluctuations and lattice instabilities across the quantum phase transition in EuCu2(Ge1-xSix)2 鈥�
   Mahmoud A. Ahmida, Dirk Johrendt, Giovanni R. Hearne, Christoph Geibel, Zakir Hossain, and Mohsen M. Abd-Elmeguid
   Phys. Rev. B 102, (2020) 155110 (1-13)
5. 鈥淐harge fluctuations across the pressure鈥搃nduced quantum phase transition in EuCu2(Ge1鈭抶Six)2鈥�
   Mahmoud A. Ahmida, Martin K. Forthaus, Christoph Geibel, Zakir Hossain, Giovanni R. Hearne, Jirka Ka拧til, Jiri Prchal, Vladimir Sechovsk媒, and Mohsen M. Abd-Elmeguid
   Phys. Rev. B 101, (2020) 205127 (1-10)
6. 鈥淯nusual pressure-induced metallic state in the correlated narrow band-gap semiconductor FeSi鈥�
   G. R. Hearne, P. Musyimi, S. Bhattacharjee, M.K. Forthaus and M.M. Abd-Elmeguid.
   Phys. Rev. B 100, (2019) 155118 (1-9). Highlighted as Editors鈥� Suggestion
7. 鈥淧ressure-induced disruption of the local environment of Fe-Fe dimers in FeGa3 accompanied by metallization鈥�
   G. R. Hearne, S. Bhattacharjee, B. P. Doyle, M. A. M. Ahmed, P. Musyimi, E. Carleschi and B. Joseph.
   Phys. Rev. B 98, (2018) 020101(R) (1-5)
   Also featured in Elettra Highlights 2018-2019
   (see https://www.elettra.eu/images/Documents/SCIENCE/Elettra%20HL%202019.pdf )
8. 鈥淓lectron-density distributions in selected ferrocenyl-pyrazolyl late transition metal complexes鈥�
   M. A. Peck, G. R. Hearne, C. Obuah and J. Darkwa
   Phys. Chem. Chem. Phys. 20, (2018) 11682-11691
9. 鈥淪ite-specific spin crossover in Fe2TiO4 post-spinel under high pressure up to nearly a megabar鈥�
   W. M. Xu, G. R. Hearne, S. Layek, D. Levy, J.-P. Iti茅, M. P. Pasternak, G. Kh Rozenberg, and E. Greenberg
   Phys. Rev. B 96, (2017) 045108 (1-11)
10. 鈥淚nterplay between structural and magnetic-electronic responses of FeAl2O4 to a megabar: Site inversion and spin crossover鈥�
    W. M. Xu, G. R. Hearne, S. Layek, D. Levy, M. P. Pasternak, G. Kh Rozenberg, and E. Greenberg
    Phys. Rev. B 97, (2018) 085120 (1-9)
11. 鈥淔eCr2O4 spinel to near megabar pressures: Orbital moment collapse and site-inversion facilitated spin crossover鈥�
    W. M. Xu, G. R. Hearne, S. Layek, D. Levy, J.-P. Iti茅, M. P. Pasternak, G. Kh Rozenberg, and E. Greenberg
    Phys. Rev. B 95, (2017) 045110 (1-9)
12. 鈥淐uFeO2 at a megabar: Stabilization of a mixed-valence low-spin magnetic semiconducting ground state鈥�
    W. M. Xu, G. R. Hearne, and M. P. Pasternak
    Phys. Rev. B 94, (2016) 035155 (1-6)
13. 鈥淐oexistence of site- and bond-centered electron localization in the high-pressure phase of LuFe2O4鈥�
    G. R. Hearne, E. Carleschi, W. N. Sibanda, P. Musyimi, G. Diguet, Yu. B. Kudasov, D. A. Maslov, and A. S. Korshunov
    Phys. Rev. B 93, (2016) 105101 (1-7)
14. 鈥淜-edge x-ray dichroism investigation of Fe1-xCoxSi: Experimental evidence for spin polarization crossover鈥�
    G.R. Hearne, G.Diguet, F.Baudelet , J.-P.Iti茅 , N.Manyala
    Journal of Magnetism and Magnetic Materials 379 , (2015) 274鈥�279
15. 鈥�(Phenoxyimidazolyl-salicylaldimine) iron complexes: synthesis , properties and iron catalysed ethylene reactions鈥�
    M. Yankey, C. Obuah, I. A. Guzei, E. Osei-Twum, G. Hearne and J. Darkwa
    Dalton Trans. 43, (2014), 13913鈥�13923

External Links

ORCID ID: 0000-0002-1662-7831