Nanotechnology Now

Our NanoNews Digest Sponsors
Heifer International

Wikipedia Affiliate Button

Home > Press > Perfect diamagnetism observation of high-temperature superconductivity in compressed H2S

(a) Simplified flow chart for the magnetic susceptibility measurement set-up for the diamond anvil cell (DAC). LIA and AC denote lock-in amplifier and alternating-current source, respectively. (b) Left: The sample in the gasket hole at 2 GPa and 200 K (left), and at 155 GPa and 300 K (right), respectively. Right: Magnetic susceptibility signals of sulfur hydride at various pressures.

CREDIT
©Science China Press
(a) Simplified flow chart for the magnetic susceptibility measurement set-up for the diamond anvil cell (DAC). LIA and AC denote lock-in amplifier and alternating-current source, respectively. (b) Left: The sample in the gasket hole at 2 GPa and 200 K (left), and at 155 GPa and 300 K (right), respectively. Right: Magnetic susceptibility signals of sulfur hydride at various pressures. CREDIT ©Science China Press

Abstract:
The discovery of the extremely high superconducting temperature (Tc) of ~200 K reported in the sulfur hydride system above 100 GPa, has broken the high-temperature superconductivity record for the copper oxides. The zero resistance superconducting measurements of sulfur hydride system have been reported by Eremets et al.. Direct, complete and many pressure-point Meissner effect measurements under high pressures are urgently needed. Motivated by this, the research group of Prof. Tian Cui from Jilin University has made a breakthrough in fulfilling the perfect diamagnetism of sulfur hydride system under high pressure, using a highly sensitive magnetic susceptibility technique adapted for a megabar-pressure diamond anvil cell (DAC).

Perfect diamagnetism observation of high-temperature superconductivity in compressed H2S

Beijing, China | Posted on June 14th, 2019

Through theoretical calculation and experimental research, scientists have found that some hydrogen-rich compounds show very high superconducting transition temperature under high pressure. For example, the superconducting transition temperature of sulfur hydride at 155 GPa is 203 K, and that of lanthanum hydride at 170 GPa is 250 K. However, the experimental studies on the superconductivity of hydrogen-rich compounds are focused on the characterization of the superconducting zero resistance characteristics. As is known to all, perfect diamagnetism is another essential characteristic of superconductors, but the experimental measurement of perfect diamagnetism in hydrogen-rich compounds at ultra-high pressure is extremely challenging. Megabar presures or even higher can be generated by the diamond anvil cell, but the sample size is less than 0.05×0.05×0.01 mm3. The very small sample dimension and sensitive metal parts of the cell lead to very low signal-to-noise ratio when performing magnetic measurement, so it is very difficult to extract weak sample signals from huge noise signals.

By suppressing the noise of signal source, shielding the transmission noise and improving the sensitivity of signal extraction, the authors optimize the magnetic measurement method based on DAC, build the magnetic susceptibility measurement system with high sensitivity, and measures the alternating current magnetic susceptibility of sulfur hydrogen sample under high pressure. They firstly sealed liquid hydrogen sulfide into a DAC using cryogenic technology. The target sample H3S was prepared by low temperature compression path and the superconducting transition was observed at 183 K and 149 GPa. The trend of superconducting transition temperature under different pressures was obtained, and the superconducting phase diagram of hydrogen sulfide was improved.

The research results show that it is feasible to measure the alternating current susceptibility in the hydrogen-rich compounds above megarbar pressure. The above research confirms the high-temperature superconductivity and determined the superconducting phase diagram of sulfur hydrogen system from magnetic susceptibility data, which opens up a broad research prospect for the experimental research of hydrogen-rich superconductors under ultra-high pressure.

####

For more information, please click here

Contacts:
Tian Cui

Copyright © Science China Press

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

See the article:

Related News Press

News and information

Nanometrics to Announce Second Quarter Financial Results on July 30, 2019 July 17th, 2019

Breakthrough material could lead to cheaper, more widespread solar panels and electronics July 16th, 2019

Caught in the act: Images capture molecular motions in real time July 15th, 2019

NUS ‘smart’ textiles boost connectivity between wearable sensors by 1,000 times: Metamaterials are incorporated into conventional clothing to dramatically improve signal strength between electronic devices, allowing for new applications July 15th, 2019

Superconductivity

Researchers report new understanding of thermoelectric materials: Discovery leads to promising new materials for converting waste heat to power June 21st, 2019

UCI scientists create new class of two-dimensional materials: Fabrication could help unlock new quantum computing and energy technologies June 6th, 2019

Scientists break record for highest-temperature superconductor: Experiment produces new material that can conduct electricity perfectly May 24th, 2019

Manipulating superconductivity using a 'mechanic' and an 'electrician' May 10th, 2019

Possible Futures

Breakthrough material could lead to cheaper, more widespread solar panels and electronics July 16th, 2019

Caught in the act: Images capture molecular motions in real time July 15th, 2019

Dresden physicists use nanostructures to free photons for highly efficient white OLEDs: Trapped light particles July 12th, 2019

Strange warping geometry helps to push scientific boundaries July 12th, 2019

Discoveries

Breakthrough material could lead to cheaper, more widespread solar panels and electronics July 16th, 2019

Caught in the act: Images capture molecular motions in real time July 15th, 2019

NUS ‘smart’ textiles boost connectivity between wearable sensors by 1,000 times: Metamaterials are incorporated into conventional clothing to dramatically improve signal strength between electronic devices, allowing for new applications July 15th, 2019

Strange warping geometry helps to push scientific boundaries July 12th, 2019

Announcements

Nanometrics to Announce Second Quarter Financial Results on July 30, 2019 July 17th, 2019

Breakthrough material could lead to cheaper, more widespread solar panels and electronics July 16th, 2019

Caught in the act: Images capture molecular motions in real time July 15th, 2019

NUS ‘smart’ textiles boost connectivity between wearable sensors by 1,000 times: Metamaterials are incorporated into conventional clothing to dramatically improve signal strength between electronic devices, allowing for new applications July 15th, 2019

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

Breakthrough material could lead to cheaper, more widespread solar panels and electronics July 16th, 2019

Caught in the act: Images capture molecular motions in real time July 15th, 2019

NUS ‘smart’ textiles boost connectivity between wearable sensors by 1,000 times: Metamaterials are incorporated into conventional clothing to dramatically improve signal strength between electronic devices, allowing for new applications July 15th, 2019

An 'EpiPen' for spinal cord injuries July 12th, 2019

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