ORCID Profile
0000-0002-2270-2295
Current Organisations
University of Warwick
,
University of Southern Queensland
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Publisher: Springer Science and Business Media LLC
Date: 04-04-2016
DOI: 10.1038/NPHYS3710
Publisher: Springer Science and Business Media LLC
Date: 16-01-2015
DOI: 10.1038/SREP07719
Abstract: Bulk crystals and thin films of PbTi 1− x Fe x O 3−δ (PTFO) are multiferroic, exhibiting ferroelectricity and ferromagnetism at room temperature. Here we report that the Ruddlesden-Popper phase Pb n +1 (Ti 1− x Fe x ) n O 3 n +1−δ forms spontaneously during pulsed laser deposition of PTFO on LaAlO 3 substrates. High-resolution transmission electron microscopy, x-ray diffraction and x-ray photoemission spectroscopy were utilised to perform a structural and compositional analysis, demonstrating that "Equation missing" and "Equation missing" . The complex dielectric function of the films was determined from far-infrared to ultraviolet energies using a combination of terahertz time-domain spectroscopy, Fourier transform spectroscopy and spectroscopic ellipsometry. The simultaneous Raman and infrared activity of phonon modes and the observation of second harmonic generation establishes a non-centrosymmetric point group for Pb n +1 (Ti 0.5 Fe 0.5 ) n O 3 n +1−δ , a prerequisite for (but not proof of) ferroelectricity. No evidence of macroscopic ferromagnetism was found in SQUID magnetometry. The ultrafast optical response exhibited coherent magnon oscillations compatible with local magnetic order and additionally was used to study photocarrier cooling on picosecond timescales. An optical gap smaller than that of BiFeO 3 and long photocarrier lifetimes may make this system interesting as a ferroelectric photovoltaic.
Publisher: American Physical Society (APS)
Date: 07-04-2006
Publisher: American Chemical Society (ACS)
Date: 29-10-2013
DOI: 10.1021/CG4011136
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CC01138E
Abstract: Novel ferrite@zeolites have been synthesized and applied in citronellal isomerization under radiofrequency heating for enhanced microreactor development.
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 2022
Publisher: Elsevier BV
Date: 11-2017
Location: United Kingdom of Great Britain and Northern Ireland
Location: United Kingdom of Great Britain and Northern Ireland
No related grants have been discovered for Martin R. Lees.