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Michael De Volder, Engineering Department - IfM
 

Mon 17 Mar 13:00: Title to be confirmed

http://talks.cam.ac.uk/show/rss/5408 - Wed, 15/01/2025 - 14:59
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Mon 10 Mar 13:00: Title to be confirmed

http://talks.cam.ac.uk/show/rss/5408 - Wed, 15/01/2025 - 14:56
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Mon 24 Feb 13:00: Title to be confirmed

http://talks.cam.ac.uk/show/rss/5408 - Wed, 15/01/2025 - 14:55
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Mon 10 Feb 13:00: Title to be confirmed

http://talks.cam.ac.uk/show/rss/5408 - Wed, 15/01/2025 - 14:54
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Mon 03 Feb 13:00: Title to be confirmed

http://talks.cam.ac.uk/show/rss/5408 - Wed, 15/01/2025 - 14:53
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Wed 22 Jan 11:15: Tuning dimensionality, magnetism and conduction in van-der-Waals Mott insulators FeP(S,Se)3

http://talks.cam.ac.uk/show/rss/5408 - Wed, 15/01/2025 - 12:43
Tuning dimensionality, magnetism and conduction in van-der-Waals Mott insulators FeP(S,Se)3

The van-der-Waals antiferromagnets TMPS3 , where TM = Transition Metal, form an ideal playground for tuning both low-dimensional magnetic and electronic properties . These are layered honeycomb antiferromagnetic Mott insulators, long studied as near-ideal 2D magnetic systems with a rich landscape of competing interactions and a variety of magnetic properties across the family. I will give an overview of my work using high pressure as a continuous tuning parameter to control the dimensionality of these materials. Due to the weak physical inter-planar forces in such van-der-Waals materials, pressure gives us clean and selective control over the interplanar spacing and hence interactions.

I will present magnetic, structural and electrical transport results and compare the behaviour of Fe-, V-, Mn- and NiPS3 as we tune them towards 3D structures – and Mott transitions from insulator to metal. I show multiple enigmatic features in electrical transport in this ‘strange metal’ high pressure regime. I will focus in particular upon our recent ultra-high pressure neutron scattering results, which have unveiled an enigmatic form of short-range magnetic order in metallic FePS3. This phase is particularly important as it most likely forms a precursor to superconductivity, and the direct observation of magnetism here completely overturns the existing wisdom in the literature of a spin-crossover transition as the Fe local environment changes. I will contrast these measurements with our recent equivalent results on sister compound FePSe3, in which superconductivity has in fact recently been observed.

Finally I will describe our recent efforts to engineer magnetic frustration into this lattice, and discuss muon-spin-rotation measurements on some members of the family which give interesting hints towards complex magnetic behaviour.

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Achieving Highly Efficient, Mechanically Robust and Thermally Stable Organic Solar Cells through Optimizing Branching Positions and Side Chain Length of Small Molecule Acceptors

http://feeds.rsc.org/rss/ee - Wed, 15/01/2025 - 11:43
Energy Environ. Sci., 2025, Accepted Manuscript
DOI: 10.1039/D4EE04969A, PaperMing Shao, Di Zhang, Junfeng Liu, Xiang Gao, Zhi Wang, Jiayi He, Zhenye Wang, Yerun Gao, Lvpeng Yang
Achieving high efficiency, mechanical robustness and long-term stability is crucial for practical application of organic solar cells (OSCs). Owing to the crystalline nature of small molecule acceptors (SMAs), high-efficiency OSCs...
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