New quantum criticality found in superconducting materials
The physicist organization network reported on the 3rd that using solid-state nuclear magnetic resonance (ssNMR) technology, scientists from the US Department of Energy ’s Ames Laboratory discovered a new quantum criticality in superconducting materials, which helps to better understand The link between unconventional superconductivity. Related papers were published in the most recent issue of Physics Review Letters.
Most iron-arsenic superconductors show magnetic and structural (also known as nematic) transitions, but what role does this transition play in the superconducting state, it is very difficult for scientists to understand.
This time, the CaK (Fe1-xNix) 4As4 compound containing calcium, potassium, iron and arsenic and a small amount of nickel manufactured by Ames Labs exhibited a new magnetic state called a hedgehog spin-a nematic transition. Antiferromagnetic state.
"Spin or nematic fluctuations are believed to play an important role in unconventional superconductivity." Said Yuji Furukawa, a senior scientist in the Ames laboratory. "With this new compound material, we hope that only Detecting its magnetic fluctuations, and nuclear magnetic resonance is one of the most sensitive detection techniques. Using solid-state nuclear magnetic resonance technology, we found that in the CaK (Fe1-xNix) 4As4 compound, the quantum criticality of the antiferromagnetic of the hedgehog spin crystals just happened. The discovery of magnetic quantum criticality indicates that spin fluctuations are the main driver of superconductivity. "
The review believes that this is a new type of magnetic arrangement. Under normal conditions, there is such an interesting interaction between superconductivity and magnetism under high pressure-high temperature superconductivity may come from antiferromagnetic near quantum critical change. (Reporter Fang Linlin)
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