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High Pressure Transport Study of Bad Metals

English title High Pressure Transport Study of Bad Metals
Applicant Forro Laszlo
Number 117742
Funding scheme Project funding
Research institution Laboratoire de nanostructures et nouveaux matériaux électroniques EPFL - SB - IPMC - LNNME
Institution of higher education EPF Lausanne - EPFL
Main discipline Material Sciences
Start/End 01.10.2007 - 31.05.2011
Approved amount 210'206.00
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Keywords (10)

HIGH PRESSURE TRANSPORT; BAD METALS; cuprates; VANADATES; NON-FERMI LIQUID BEHAVIOR; SHORT MEAN FREE PATH COND; short mean free path conductors; organic conductors; dichalcogenides; excitonic superconductors

Lay Summary (English)

Lead
Lay summary
There has been a great deal of interest in the relationship between various exotic low temperature phases of strongly correlated systems, including the antiferromagnetic insulating and unconventional superconducting phases of the high Tc cuprates, the charge ordered insulating and ferromagnetic metal phases of the manganese perovskites, the orbital-ordered and ferromagnetic metal phases of the ruthenates, low-dimensional organic conductors, and the charge-density-wave (CDW) and superconducting phases of layered dichalcogenides such as 2H-NbSe2. It turns out that strong correlations have their fingerprints not only at low temperatures, but at high temperatures, as well. The electrical resistivity is enhanced over the value expected for a good conductor; the electronic mean free path is very short, often even shorter than the lattice spacing. In other words, despite the metallic-like temperature dependence of the resistivity, strictly speaking some of them do not qualify for metals and they are very often called as bad metals. The understanding of these materials is a scientific challenge. Our goal is the investigation of bad metallicity by transport and magnetotransport studies in wide pressure (up to 10 GPa) and temperature (1-800 K) ranges. The lattice compression can vary the electron-phonon coupling, the screening of the electron-electron interactions, alter the exchange interaction, suppresses low-dimensional fluctuations, etc. We are confident that in some cases high pressures can tune the transition from a bad metal to a good metal (in some cases from non-Fermi liquid to a Fermi liquid), thus contributing towards the understanding of this peculiar transport mechanism.
Direct link to Lay Summary Last update: 21.02.2013

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Associated projects

Number Title Start Funding scheme
138053 High pressure transport study of bad metals: thermoelectric power 01.10.2011 Project funding
101998 High Pressure Transport Study of Bad Metals 01.10.2003 Project funding

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