Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Aberrant electronic and structural alterations in pressure tuned perovskite NaOsO3

Electronic and structural phase diagram of NaOsO3

CREDIT
Raimundas Sereika
Electronic and structural phase diagram of NaOsO3 CREDIT Raimundas Sereika

Abstract:
The perovskite NaOsO3 has a complicated, but interesting temperature dependent metal-insulator transition (MIT). A team led by Drs. Raimundas Sereika and Yang Ding from the Center for High Pressure Science and Technology Advanced Research (HPSTAR) showed that the insulating ground state in NaOsO3 can be preserved up to at least 35 GPa with a sluggish MIT reduction from 410 K to a near room temperature and possible transformation to a polar phase. The work published in the npj Quantum Materials.

Aberrant electronic and structural alterations in pressure tuned perovskite NaOsO3

Beijing, China | Posted on September 18th, 2020

NaOsO3 perovskite undergoes a metal-insulator transition concomitant with the onset of an antiferromagnetic long-range ordering at a Neel temperature of about 410 K which is accompanied by a magnetic ordering without any lattice distortion.

The team carried out a combined experimental and computational study to understand the effect of external pressure on perovskite NaOsO3. They found hidden hysteretic resistance properties with a transient metallic state near 200 K. Also three electronic character anomalies (at 1.7, 9.0, and 25.5 GPa), and a structural transition to the singular polar phase (at ~ 18 GPa) were discovered.

In terms of the MIT, the pressure-dependent electrical transport measurements indicate that the metallic state extends to the lower temperatures very slowly. The TMIT scales almost linearly upon pressure. At around 32 GPa, the MIT becomes much broader, but can still be identified. Importantly, up to this pressure, NaOsO3 preserves the insulating ground state.

In addition, the warming and cooling curves slightly deviate, forming a narrow thermal hysteresis loop below MIT. The hysteresis is progressively attenuated upon pressure but eventually disappears at about 18 GPa. "The observed hysteresis raises a question if MIT is really the second-order type that was initially assigned," Sereika said.

Further, when the pressure is increased, the Raman results show that NaOsO3 experiences a structural change. The Raman spectra in particular demonstrate the enhancement of the number of phonons and the pressure-induced-splitting of phonon mode above 18 GPa.

"Our pressure-dependent Raman measurements support the fact that the crystal symmetry does not change up to 16 GPa at room temperature and indicates that further pressure increase causes structural transformation to a different symmetry," Ding explained.

"At about 26 GPa, the continuous large-scale reduction in intensity is observed as the pressure increases. Finally, the Raman modes almost vanish at 35 GPa, indicating that sample is approaching a metallic state, that is the MIT," Ding added.

By combining theoretical modeling and experimental data all observed phenomena were explained in detail. A rich electronic and structural phase diagram of NaOsO3 shows the different types of transitions occurring in the system when pressure and temperature are applied: insulator-to-bad metal, bad-metal-to-metal, the anomalous metal island in the bad-metal region, and the subtle non-polar to polar structural transition.

At low temperature the system remains insulating up to a certain critical pressure (~20 GPa in DFT) and then transforms into a bad metal due to the closing of the indirect gap. In this pressure range the valence and conduction bands are still separated by a direct gap. This gap closes at very large pressure, indicating that the evolution of the electronic properties upon pressure share similarities with the temperature-induced band gap closing process.

"The magnetically itinerant Lifshitz-type mechanism with spin-orbit and spin-phonon interactions is responsible for these pressure-induced changes," Ding remarked. "Our findings provide another new playground for the emergence of new states in 5d materials by using high-pressure methods."

####

For more information, please click here

Contacts:
Haini Dong

86-021-801-77125

Copyright © Center for High Pressure Science and Technology Advanced Research

If you have a comment, please Contact us.

Issuers of news releases, not 7th Wave, Inc. or Nanotechnology Now, are solely responsible for the accuracy of the content.

Bookmark:
Delicious Digg Newsvine Google Yahoo Reddit Magnoliacom Furl Facebook

Related Links

"Aberrant electronic and structural alterations in pressure tuned perovskite NaOsO3", npj Quantum Materials (2020) 5:66.:

Related News Press

News and information

Deca Partners with ADTEC Engineering to Enhance Adaptive Patterning™ for 2µm Chiplet Scaling October 20th, 2020

Graphenea awarded “Best Graphene Firm” prize October 20th, 2020

Veeco Announces Aledia Order of 300mm MOCVD Equipment for microLED Displays: Propel™ Platform First 300mm System with EFEM Designed for Advanced Display Applications October 20th, 2020

Revealing the reason behind jet formation at the tip of laser optical fiber October 16th, 2020

Perovskites

Crystal structure discovered almost 200 years ago could hold key to solar cell revolution July 3rd, 2020

Printed perovskite LEDs: An innovative technique towards a new standard process of electronics manufacturing June 12th, 2020

Getting through the bottleneck—A new class of layered perovskite with high oxygen-ion conductivity April 29th, 2020

Argonne scientists fashion new class of X-ray detector: New perovskite-based detectors can sense X-rays over a broad energy range. April 24th, 2020

Possible Futures

Deca Partners with ADTEC Engineering to Enhance Adaptive Patterning™ for 2µm Chiplet Scaling October 20th, 2020

Graphenea awarded “Best Graphene Firm” prize October 20th, 2020

Veeco Announces Aledia Order of 300mm MOCVD Equipment for microLED Displays: Propel™ Platform First 300mm System with EFEM Designed for Advanced Display Applications October 20th, 2020

Multi-state data storage leaving binary behind: Stepping 'beyond binary' to store data in more than just 0s and 1s October 16th, 2020

Discoveries

Revealing the reason behind jet formation at the tip of laser optical fiber October 16th, 2020

Multi-state data storage leaving binary behind: Stepping 'beyond binary' to store data in more than just 0s and 1s October 16th, 2020

Octopus-inspired sucker transfers thin, delicate tissue grafts and biosensors October 16th, 2020

Controlling the speed of enzyme motors brings biomedical applications of nanorobots closer: Recent advances in this field have made micro- and nanomotors promising devices for solving many biomedical problems October 13th, 2020

Materials/Metamaterials

Development of cost-efficient electrocatalyst for hydrogen production: Development of a highly efficient and durable electrocatalyst for water electrolysis that will lead to cost-efficient hydrogen production. Trace amounts of titanium doping on low-cost molybdenum phosphide resu October 9th, 2020

Graphene detector reveals THz light's polarization October 8th, 2020

Multi-institutional team extracts more energy from sunlight with advanced solar panels October 6th, 2020

The most sensitive and fastest graphene microwave bolometer September 30th, 2020

Announcements

Deca Partners with ADTEC Engineering to Enhance Adaptive Patterning™ for 2µm Chiplet Scaling October 20th, 2020

Graphenea awarded “Best Graphene Firm” prize October 20th, 2020

Veeco Announces Aledia Order of 300mm MOCVD Equipment for microLED Displays: Propel™ Platform First 300mm System with EFEM Designed for Advanced Display Applications October 20th, 2020

GLOBALFOUNDRIES Accelerating Innovation in IoT and Wearables with Adaptive Body Bias Feature on 22FDX Platform October 16th, 2020

Interviews/Book Reviews/Essays/Reports/Podcasts/Journals/White papers/Posters

Making disorder for an ideal battery: Manufacturing safer, more powerful batteries that use geopolitically stable resources requires solid electrolytes and replacing lithium with sodium. A chemical solution is now being offered to battery developers. October 16th, 2020

Revealing the reason behind jet formation at the tip of laser optical fiber October 16th, 2020

Multi-state data storage leaving binary behind: Stepping 'beyond binary' to store data in more than just 0s and 1s October 16th, 2020

Octopus-inspired sucker transfers thin, delicate tissue grafts and biosensors October 16th, 2020

NanoNews-Digest
The latest news from around the world, FREE




  Premium Products
NanoNews-Custom
Only the news you want to read!
 Learn More
NanoStrategies
Full-service, expert consulting
 Learn More











ASP
Nanotechnology Now Featured Books




NNN

The Hunger Project