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:6/23/2016)... ... June 23, 2016 , ... ClinCapture, the ... Convention Center and will showcase its product’s latest features from June 26 to ... a scientific poster on Disrupting Clinical Trials in The Cloud during the conference. ...
(Date:6/23/2016)... ... June 23, 2016 , ... Velocity ... intelligent tools designed, tuned and optimized exclusively for Okuma CNC machining centers at ... result of a collaboration among several companies with expertise in toolholding, cutting tools, ...
(Date:6/23/2016)... India , June 23, 2016 ... media market research report to its pharmaceuticals section ... profiles, product details and much more. ... spread across 151 pages, profiling 15 companies and ... available at http://www.reportsnreports.com/reports/601420-global-cell-culture-media-industry-2016-market-research-report.html . ...
(Date:6/22/2016)... , June 22, 2016 Research and ... Global Markets" report to their offering. ... billion in 2014 from $29.3 billion in 2013. The market is ... of 13.8% from 2015 to 2020, increasing from $50.6 billion in ... projected product forecasts during the forecast period (2015 to 2020) are ...
Breaking Biology Technology:
(Date:4/13/2016)... , April 13, 2016  IMPOWER physicians supporting ... are setting a new clinical standard in telehealth thanks ... By leveraging the higi platform, IMPOWER patients can routinely ... pulse and body mass index, and, when they opt ... and convenient visit to a local retail location at ...
(Date:3/31/2016)... , March 31, 2016  Genomics firm Nabsys has ... CEO, Barrett Bready , M.D., who returned to ... the original technical leadership team, including Chief Technology Officer, ... Product Development, Steve Nurnberg and Vice President of Software ... the company. Dr. Bready served as CEO ...
(Date:3/23/2016)... WAKEFIELD, Massachusetts , March 23, 2016 ... kombiniert im Interesse erhöhter Sicherheit Gesichts- und ... Xura, Inc. (NASDAQ: MESG ... heute bekannt, dass das Unternehmen mit SpeechPro ... insbesondere aus der Finanzdienstleistungsbranche, wird die Möglichkeit ...
Breaking Biology News(10 mins):