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ENERGY TECH
New chromium-based superconductor has an unusual electronic state
by Staff Writers
Kobe, Japan (SPX) Jul 27, 2017


Crystal structures of the new superconductor, an iron-based superconductor, and a high-temperature copper-oxide superconductor. Image courtesy Kobe University.

When certain materials are cooled below a critical temperature they become superconductors, with zero electrical resistance. An international research team observed an unusual electronic state in new superconductor chromium arsenide. This finding could prove useful in future superconductor research and material design. The study was published on June 5 in Nature Communications.

These discoveries were made by a research team at the Chinese University of Hong Kong in collaboration with Associate Professor KOTEGAWA Hisashi (Kobe University Graduate School of Science) and other researchers from Kobe University and Kyoto University.

Well-known superconductors include high-temperature copper-oxide superconductors and iron-based superconductors. These have two-dimensional layered crystal structures. In contrast, chromium arsenide has a "non-symmorphic" crystal structure formed by zigzag chains of chromium (see figure 1). The relationship between this crystal structure and its superconductivity has drawn attention from scientists.

The superconductivity of chromium arsenide was discovered in 2014 under pressure, and it is the first magnetic superconductor to incorporate chromium.

The research group found that at ultralow temperatures, the electrical resistance of chromium arsenide shows a linear increase against the magnetic field. In normal metals the resistance increases as a square of the magnetic field, creating a curved (parabolic) graph, but the magnetic field resistance of chromium arsenide makes a linear graph (see figure 2).

Linear magnetic resistance is created under extremely special circumstances when electron mass within a solid effectively becomes smaller. There are cases of it occurring in non-magnetic low carrier materials, but chromium arsenide is a metal with strong magnetic properties and very different qualities from other materials that have shown linear magnetic resistance. The special crystal structure of chromium arsenide may have created this unusual electronic state.

These findings show that the superconductivity of chromium arsenide features an unusual electronic state, information that could contribute to superconductivity research and material design.

Research paper

ENERGY TECH
High-temperature superconductivity in B-doped Q-carbon
Raleigh NC (SPX) Jul 25, 2017
Researchers at North Carolina State University have significantly increased the temperature at which carbon-based materials act as superconductors, using a novel, boron-doped Q-carbon material. The previous record for superconductivity in boron-doped diamond was 11 Kelvin, or minus 439.60 degrees Fahrenheit. The boron-doped Q-carbon has been found to be superconductive from 37K to 57K, whi ... read more

Related Links
Kobe University
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