Unifying phase diagrams could be used to find materials with useful applications in magnetic memory
A new study from the Cava lab has revealed a unifying connection between seemingly unrelated materials that exhibit extreme magnetoresistance, the ability of some materials to drastically change their electrical resistance in response to a magnetic field, a property that could be useful in magnetic memory applications.
"The chemistry of these materials looks completely different but they're connected on a profound level by their physics," said Robert Cava, the Russell Wellman Moore professor of chemistry and corresponding author on the work published in the Proceedings of the National Academy of Sciences.
Numerous materials with extreme magnetoresistance have been reported since the Cava lab first discovered extreme magnetoresistance (originally named 'large magnetoresistance' by Nature editors before the research field supplanted it with the current term) in WTe2 two years ago.
But in particular, researchers in the Cava lab noticed that five materials with extreme magnetoresistance yet very different structures and chemical make-up all share the same characteristics when their resistance-temperature-applied-magnetic-field diagrams are measured. This diagram maps the temperature and magnetic field strength at which the material's magnetoresistance turns on and then saturates. Using the phase diagrams as a clue, scientists may be able to identify other materials with extreme magnetoresistance.
Detailed investigations by Fazel Tafti, a former Cava lab postdoc and physics PhD, revealed a common feature related to the materials' electronic structures, leading the researchers to propose a picture of the underlying physics that unifies these chemically disparate materials. This kind of research, where materials chemistry and materials physics meet, is what the Cava lab and its collaborators enjoy the most, Cava said.
"Now we hope that other people will think about this, and make more measurements to see whether our proposal for the unifying physics holds up to more intense scrutiny," Cava said. He was confident that first author Fazel Tafti, now an assistant professor of physics at Boston College, would get to the bottom of this phenomenon. "Physicists quest for truth," he said.
Read the full article here:
Tafti, F. F.; Gibson, Q.; Kushwaha, S.; Krizan, J. W.; Haldolaarachchige, N.; Cava, R. J. "Temperature-field phase diagram of extreme magnetoresistance." Published online before print June 7, 2016.
This research was supported by the Gordon and Betty Moore Foundation under the EPiQS program, Grant GBMF 4412 and the ARO MURI on topological insulators, Grant W911NF-12-1-0461.
Tien Nguyen | EurekAlert!
Breaking bad metals with neutrons
16.01.2018 | DOE/Argonne National Laboratory
White graphene makes ceramics multifunctional
16.01.2018 | Rice University
What enables electrons to be transferred swiftly, for example during photosynthesis? An interdisciplinary team of researchers has worked out the details of how...
For the first time, scientists have precisely measured the effective electrical charge of a single molecule in solution. This fundamental insight of an SNSF Professor could also pave the way for future medical diagnostics.
Electrical charge is one of the key properties that allows molecules to interact. Life itself depends on this phenomenon: many biological processes involve...
At the JEC World Composite Show in Paris in March 2018, the Fraunhofer Institute for Laser Technology ILT will be focusing on the latest trends and innovations in laser machining of composites. Among other things, researchers at the booth shared with the Aachen Center for Integrative Lightweight Production (AZL) will demonstrate how lasers can be used for joining, structuring, cutting and drilling composite materials.
No other industry has attracted as much public attention to composite materials as the automotive industry, which along with the aerospace industry is a driver...
Scientists at Tokyo Institute of Technology (Tokyo Tech) and Tohoku University have developed high-quality GFO epitaxial films and systematically investigated their ferroelectric and ferromagnetic properties. They also demonstrated the room-temperature magnetocapacitance effects of these GFO thin films.
Multiferroic materials show magnetically driven ferroelectricity. They are attracting increasing attention because of their fascinating properties such as...
The oceans are the largest global heat reservoir. As a result of man-made global warming, the temperature in the global climate system increases; around 90% of...
08.01.2018 | Event News
11.12.2017 | Event News
08.12.2017 | Event News
18.01.2018 | Medical Engineering
18.01.2018 | Ecology, The Environment and Conservation
17.01.2018 | Ecology, The Environment and Conservation