Pressure-induced Lifshitz transition in NbP: Raman, x-ray diffraction, electrical transport, and density functional theory

Gupta SN, Singh A, Pal K, Muthu DVS, Shekhar C, Qi Y, Naumov PG, Medvedev SA, Felser C, Waghmare UV, Sood AK (2018)

Publication Type: Journal article

Publication year: 2018

Journal

Physical Review B American Physical Society

Book Volume: 97

Article Number: 064102

Journal Issue: 6

DOI: 10.1103/PhysRevB.97.064102

Abstract

We report high-pressure Raman, synchrotron x-ray diffraction, and electrical transport studies on Weyl semimetals NbP and TaP along with first-principles density functional theoretical (DFT) analysis. The frequencies of first-order Raman modes of NbP harden with increasing pressure and exhibit a slope change at Pc∼9 GPa. The pressure-dependent resistivity exhibits a minimum at Pc. The temperature coefficient of resistivity below Pc is positive as expected for semimetals but changes significantly in the high-pressure phase. Using DFT calculations, we show that these anomalies are associated with a pressure-induced Lifshitz transition, which involves the appearance of electron and hole pockets in its electronic structure. In contrast, the results of Raman and synchrotron x-ray diffraction experiments on TaP and DFT calculations show that TaP is quite robust under pressure and does not undergo any phase transition.

Involved external institutions

Indian Institute of Science (IISc) IN India (IN) Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR) IN India (IN) Max-Planck-Institut für Chemische Physik fester Stoffe (MPI CPfS) / Max Planck Institute for Chemical Physics of Solids DE Germany (DE)

How to cite

APA:

Gupta, S.N., Singh, A., Pal, K., Muthu, D.V.S., Shekhar, C., Qi, Y.,... Sood, A.K. (2018). Pressure-induced Lifshitz transition in NbP: Raman, x-ray diffraction, electrical transport, and density functional theory. Physical Review B, 97(6). https://doi.org/10.1103/PhysRevB.97.064102

MLA:

Gupta, Satyendra Nath, et al. "Pressure-induced Lifshitz transition in NbP: Raman, x-ray diffraction, electrical transport, and density functional theory." Physical Review B 97.6 (2018).

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