Record Breaking Weyl Semimetal Tungsten Diphosphide – WP2

by Tommy on 14/03/2017

It’s something new every day, for the guy who utterly failed to predict the iron arsenides in 1994.

Extremely high magnetoresistance and conductivity in the type-II Weyl semimetal WP2, Nitesh Kumar, Yan Sun, Kaustuv Manna, Vicky Suess, Inge Leermakers, Olga Young, Tobias Foerster, Marcus Schmidt, Binghai Yan, Uli Zeitler, Claudia Felser and Chandra Shekhar (13 March 2017)

The experimental realization of tungsten diphosphide, WP2, a type-II Weyl semimetal with robust Weyl points is presented. Weyl points are closely located to each other in the Brillouin zone but here are of the same chirality and are therefore protected against annihilation from structural distortions or defects. The single crystals show extremely high residual resistivity (RRR) values of 25,000 with a very low residual resistivity of 3 nano-ohm cm, and an enormous, highly anisotropic, magnetoresistance that exceeds 200 million percent at 63 T and 0.5 K. These properties are likely a consequence of the novel fermions expressed in this compound.

I did point out that any metal-insulator sitting across the metalloid band would be cool, though.

In this case, very cool.

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