Organic Metals

From the everyday experience one normally identifies organic materials as electrical insulators. However, there is a class of synthetic molecular charge-transfer salts, which exhibit metallic conductivity, some of them being even superconductors.
Team
Mark Kartsovnik, Werner Biberacher, Shamil Erkenov, Rudolf Gross
Recent projects
Evolution of the charge carrier properties and electronic correlations in layered organic metals near the Mott metal-insulator transition
Rudolf Gross, Mark Kartsovnik, N/A
Recent publications
Coherent heavy charge carriers in an organic conductor near the bandwidth-controlled Mott transition
Sebastian Oberbauer, Shamil Erkenov, Werner Biberacher, Natalia D. Kushch, Rudolf Gross, Mark V. Kartsovnik
Research Article | Physical Review B 107, 075139  (2023)
Preprint: arXiv:2208.03230
Experimental evidence for Zeeman spin–orbit coupling in layered antiferromagnetic conductors
R. Ramazashvili, P. D. Grigoriev, T. Helm, F. Kollmannsberger, M. Kunz, W. Biberacher, E. Kampert, H. Fujiwara, A. Erb, J. Wosnitza, R. Gross & M. V. Kartsovnik
Research Article | npj Quantum Materials 6, 11  (2021)
Spin Vortex Crystal Order in Organic Triangular Lattice Compound
Kira Riedl, Elena Gati, David Zielke, Steffi Hartmann, Oleg M. Vyaselev, Nataliya D. Kushch, Harald O. Jeschke, Michael Lang, Roser Valentí, Mark V. Kartsovnik, Stephen M. Winter
Research Article | Physical Review Letters 127, 147204  (2021)
Preprint: arXiv:2106.02130
Fermi surface properties of the bifunctional organic metal kappa-(BETS)2Mn[N(CN)2]3 near the metal--insulator transition
V.N. Zverev, W. Biberacher, S. Oberbauer, I. Sheikin, P. Alemany, E. Canadell, M.V. Kartsovnik
Research Article | Physical Review B 99, 125136  (2019)
Magnetotransport evidence for irreversible spin reorientation in the collinear antiferromagnetic state of underdoped Nd2-xCexCuO4
A. Dorantes, A. Alshemi, Z. Huang, A. Erb, T. Helm, M. V. Kartsovnik
Research Article | Physical Review B 97, 054430  (2018)

The key common features of these crystalline organic metals,

  • extremely high electronic anisotropy: quasi-one & quasi-two-dimensional conduction bands,
  • strong electron-electron and electron-phonon interactions, 

give rise to very rich electronic phase diagrams and fascinating phenomena such as charge- and spin-density waves, quantum electric-dipole- and spin-liquid states, topological excitations, etc. Of special interest is the emergence of superconductivity in close proximity to various insulating ground states, similarly to what happens in other exotic superconductors like high-Tc cuprates, iron-pnictides and chalcogenides.

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