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Kumar, Nitesh; Sun, Yan; Nicklas, Michael; Watzman, Sarah J; Young, Olga; Leermakers, Inge; Hornung, Jacob; Klotz, Johannes; Gooth, Johannes; Manna, Kaustuv; Süß, Vicky; Guin, Satya N; Förster, Tobias; Schmidt, Marcus; Muechler, Lukas; Yan, Binghai; Werner, Peter; Schnelle, Walter; Zeitler, Uli; Wosnitza, Jochen; Parkin, Stuart S P; Felser, Claudia; Shekhar, Chandra
Nature communications, 06/2019, Volume: 10, Issue: 1Journal Article
Weyl and Dirac fermions have created much attention in condensed matter physics and materials science. Recently, several additional distinct types of fermions have been predicted. Here, we report ultra-high electrical conductivity in MoP at low temperature, which has recently been established as a triple point fermion material. We show that the electrical resistivity is 6 nΩ cm at 2 K with a large mean free path of 11 microns. de Haas-van Alphen oscillations reveal spin splitting of the Fermi surfaces. In contrast to noble metals with similar conductivity and number of carriers, the magnetoresistance in MoP does not saturate up to 9 T at 2 K. Interestingly, the momentum relaxing time of the electrons is found to be more than 15 times larger than the quantum coherence time. This difference between the scattering scales shows that momentum conserving scattering dominates in MoP at low temperatures.
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