Navigation Links
Advanced light source provides a new look at vanadium dioxide
Date:10/23/2013

Graphene may command the lion's share of attention but it is not the only material generating buzz in the electronics world. Vanadium dioxide is one of the few known materials that acts like an insulator at low temperatures but like a metal at warmer temperatures starting around 67 degrees Celsius. This temperature-driven metal-insulator transition, the origin of which is still intensely debated, in principle can be induced by the application of an external electric field. That could yield faster and much more energy efficient electronic devices.

"If the origin of this metal-insulator transition is electronic, the application of an electric field should trigger the transition on a picosecond or faster time-scale," says Nagaphani Aetukuri at the IBM-Stanford Spintronic Science and Applications Center (SpinAps). "This would be the basis for an ultrafast electronic switch, in which devices would be activated so quickly that very little energy would be lost through dissipation."

To determine the origin of the metal-insulator transition of vanadium dioxide, Aetukuri and a collaboration of researchers led by Stuart Parkin, of SpinAps and the IBM Almaden Research Center and Hermann Drr of the SLAC National Laboratory, studied thin films of the material at Berkeley Lab's Advanced Light Source (ALS). Using ALS beamline 4.0.2, an undulator beamline that can provide soft X-rays with variable linear polarization, they performed a series of strain-, polarization- and temperature-dependent X-ray absorption spectroscopy tests, in conjunction with X-ray diffraction and electrical transport measurements.

"Our results outlined the electronic properties that govern the metal-insulator transitions in vanadium dioxide and identified for the first time the respective roles of the Pi-symmetry and delta-symmetry electron orbitals," Aetukuri says. "We believe that the metallic phase of vanadium dioxide can be stabilized by populating the Pi-Symmetry orbitals, which means that engineering devices on a nanoscale that can selectively transfer electrons to the Pi-symmetry orbitals should trigger an insulator to metal transition."

This study was made possible by the X-ray beams at ALS beamline 4.0.2, which penetrated the vanadium dioxide thin films to a depth of about five nanometers, providing a bulk-sensitive probe with minimal effects from surface adsorbates.

Elke Arenholz, an ALS scientist who manages beamline 4.0.2, explains. "It was crucial for the experiment to be performed at a beamline where the orientation of the beam could be changed from parallel to perpendicular without moving the sample. Moreover, beamline 4.0.2 also provided the stability and accuracy needed to measure nanoscale effects."


'/>"/>

Contact: Lynn Yarris
lcyarris@lbl.gov
510-486-5375
DOE/Lawrence Berkeley National Laboratory
Source:Eurekalert  

Related biology technology :

1. Celladon Corporation Announces Publication of Long Term Follow-Up Results from the MYDICAR CUPID 1 Trial in Advanced Heart Failure
2. Discovery Meets Recovery in New Cedars-Sinai’s Advanced Health Sciences Pavilion Designed by HOK
3. Advanced Biologics Opens New and Expanded Headquarters in Carlsbad, California
4. Advanced Care Veterinary Services Proves Stem Cell Therapy May Be the Best Weapon in Fighting Pet Pain Due to Arthritis
5. Advanced Tissue Services Offering Discounts on Bio-specimens Utilized in Academic Research
6. 2013 NASA Advanced Technology Phase I Concepts Selected For Study
7. Primary Progression-Free Survival Endpoint Met in Phase III Study of Nintedanib Plus Docetaxel in Second-Line Advanced NSCLC
8. Syngenta Opens Unique $72 Million Advanced Crop Lab
9. Study: FOLFIRINOX Followed by Chemoradiation Shows Substantial Activity in Locally Advanced Pancreatic Cancer
10. Amphora Research Systems welcomes Advanced Polymer Monitoring Technologies
11. Photonics-Enabled Tools for Forensic Investigations to be Advanced at SPIE DSS
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Advanced light source provides a new look at vanadium dioxide
(Date:1/23/2017)... ... 2017 , ... AxioMed will be presenting its viscoelastic cervical ... Montego Bay, Jamaica from January 26-28th. “We’re excited to be presenting the benefits ... the simplicity of the surgical technique,” said Jake Lubinski, President of AxioMed. ...
(Date:1/21/2017)... ... 20, 2017 , ... G&L Scientific Inc, a leading provider ... ), has announced the opening of new offices in Cambridge, Massachusetts, strengthening and ... This is the latest step in G&L’s expansion of its global clinical consulting ...
(Date:1/21/2017)... CA (PRWEB) , ... January 21, 2017 , ... ... our ongoing endeavors to bring to market a pioneering medical device for the ... has signed an engagement contract with Emergo, a global regulatory consultancy that helps ...
(Date:1/21/2017)... BOULDER, Colo. , Jan. 20, 2017 ... ("Bioptix" or the "Company"), announced that on January 14, ... a plan under which the Company will terminate certain ... subsidiary, Bioptix Diagnostics, Inc.  The Company commenced terminations on ... completed within 30 days.  The Company may pay severance ...
Breaking Biology Technology:
(Date:1/11/2017)... 11, 2017 Intoxalock, a leading ignition interlock ... of its patent-pending calibration device. With this new technology, ... securely upload data logs and process repairs at service ... "Fighting drunk driving through the application of cutting-edge ... large, but also for the customer who can get ...
(Date:1/6/2017)...  Delta ID Inc., a leader in consumer-grade iris ... at CES® 2017. Delta ID has collaborated with Gentex ... use of iris scanning as a secure, reliable and ... a car, and as a way to elevate the ... Delta ID and Gentex will demonstrate (booth #7326 LVCC) ...
(Date:12/22/2016)... , Dec. 20, 2016  As part of its longstanding ... leading personal genetics company, recently released its latest children,s book, ... The book focuses on the topics of inheritance and variation ... Standards (NGSS) taught in elementary school classrooms in the US. ... series by illustrator Ariana Killoran , whose previous book ...
Breaking Biology News(10 mins):