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Tuning the electronic and the crystalline structure of LaBi by pressure: From extreme magnetoresistance to superconductivity

2017; American Physical Society; Volume: 95; Issue: 1 Linguagem: Inglês

10.1103/physrevb.95.014507

2469-9977

Fazel Tafti, M. S. Torikachvili, Ryan L. Stillwell, Bruce J. Baer, Elissaios Stavrou, Samuel T. Weir, Yogesh K. Vohra, Hung‐Yu Yang, E. F. McDonnell, Satya Kushwaha, Quinn Gibson, R. J. Cava, Jason R. Jeffries,

Iron-based superconductors research

Extreme magnetoresistance (XMR) in topological semimetals is a recent discovery which attracts attention due to its robust appearance in a growing number of materials. To search for a relation between XMR and superconductivity, we study the effect of pressure on LaBi. By increasing pressure, we observe the disappearance of XMR followed by the appearance of superconductivity at $P\ensuremath{\approx}3.5$ GPa. We find a region of coexistence between superconductivity and XMR in LaBi in contrast to other superconducting XMR materials. The suppression of XMR is correlated with increasing zero-field resistance instead of decreasing in-field resistance. At higher pressures, $P\ensuremath{\approx}11$ GPa, we find a structural transition from the face-centered cubic lattice to a primitive tetragonal lattice, in agreement with theoretical predictions. The relationship between extreme magnetoresistance, superconductivity, and structural transition in LaBi is discussed.