. 24/7 Space News .
Topology explains queer electrical current boost in non-magnetic metal
by Staff Writers
Kyoto, Japan (SPX) Apr 15, 2016

Applying a magnetic field to PdCoO2, a non-magnetic metal, made it conduct 70% more electricity, even though basic physics principles would have predicted the opposite. Image courtesy Eiri Ono/Kyoto University. For a larger version of this image please go here.

Insights from pure mathematics are lending new insights to material physics, which could aid in development of new devices and sensors. Now an international team of physicists has discovered that applying a magnetic field to a non-magnetic metal made it conduct 70% more electricity, even though basic physics principles would have predicted the opposite.

"We never expected that magnetoresistance could be lowered even further in the compound we tested, because in theory it should have increased," says Kyoto University study author Shingo Yonezawa.

Applying a magnetic field to metals affects how well they are able to conduct electricity. Resistance arising from the magnetic field - magnetoresistance - is used in contexts like writing data in hard discs. Because of its wide application potential, material physicists are constantly striving to find new materials that show large-scale magnetoresistance.

Exposing a non-magnetic metal to a magnetic field typically increases its resistance and reduces the amount of electric current that is able to pass through it. Researchers at Kyoto University and the National Institute for Materials Science, in collaboration with researchers at National High-Magnetic Field Laboratory in the US, observed otherwise, however; when they applied a magnetic field to the compound PdCoO2, its resistance actually decreased, consequently increasing electrical current.

"Oxides tend not to deliver currents so readily, but PdCoO2 is one the oxides that actually conduct electricity beautifully," says Yonezawa. "It already has low resistance relative to other oxides."

The phenomenon remained unexplained until colleagues from the United States made a link with an analogy from topology, a mathematics discipline concerning continuous deformations.

"Electrons in some classes of materials have topological characteristics that lead them to be 'boosted' by magnetic fields, ultimately decreasing resistance," continues Yonezawa. Although PdCoO2 was believed to lack such topological characteristics, it turns out that in the magnetic field this material can exhibit a phenomenon similar to these, aided by its very 'clean', layered crystal structure."

Resistance also decreased in compounds PtCoO2 and Sr2RuO4, which have similar layered structures to PdCoO2.

"From these observations we now know that the phenomenon generally applies to other oxides with a layered structure," explains Yoshiteru Maeno, a senior author also at Kyoto University. "Further developments in stratified non-magnetic metals with good conductivity should bring about new devices and sensors that have large magnetoresistance even when exposed to weak magnetic fields."

Research paper: "Interplanar coupling-dependent magnetoresistivity in high-purity layered metals" appeared March 39, 2016 in Nature Communications, with doi: 10.1038/ncomms10903

Thanks for being here;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.
SpaceDaily Contributor
$5 Billed Once

credit card or paypal
SpaceDaily Monthly Supporter
$5 Billed Monthly

paypal only


Related Links
Kyoto University
Space Technology News - Applications and Research

Comment on this article via your Facebook, Yahoo, AOL, Hotmail login.

Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

Previous Report
Catalyst could make production of key chemical more eco-friendly
Providence RI (SPX) Apr 14, 2016
The world has more carbon dioxide than it needs, and a team of Brown University chemists has come up with a potential way to put some of it to good use. The researchers developed a new composite catalyst using nitrogen-rich graphene dotted with copper nanoparticles. A study, published in the journal Nano Energy, showed that the new catalyst can efficiently and selectively convert carbon dioxide ... read more

Supernova iron found on the moon

Russia to shift all Lunar launches to Vostochny Cosmodrome

Lunar lava tubes could help pave way for human colony

The Moon thought to play a major role in maintaining Earth's magnetic field

Russia, Italy plan first bid to explore beneath mars surface in 2018

First light for ExoMars

First joint EU-Russian ExoMars mission to reach Mars orbit Oct 16

Help keep heat on Mars Express through data mining

NASA begins testing of revolutionary e-sail technology

Concept's success buoys Commercial Crew's path to flight

A US Department of Space

New, fast solar wind propulsion system is aim of NASA, UAH study

China begins testing Tiangong-2 space lab

Lessons learned from Tiangong 1

China launches SJ-10 retrievable space science probe

Has Tiangong 1 gone rogue

NASA to test first expandable habitat on ISS

Dragon and Cygnus To Meet For First Time In Space

Russian cargo ship docks successfully with space station

Russia launches cargo ship to space station

Orbital ATK awarded major sounding rocket contract by NASA

SpaceX lands rocket on ocean platform for first time

SpaceX cargo arrives at crowded space station

Orbital ATK receives NASA order for rockets

1917 astronomical plate has first-ever evidence of exoplanetary system

Stars strip away atmospheres of nearby super-Earths

Cooked planets shrink due to radiation

More accurately measuring distances between planetary nebulae and Earth

Cooling down the hot side of space hardware

Brittle is better for making cement

Catalyst could make production of key chemical more eco-friendly

Graphene is both transparent and opaque to radiation

The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.