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Pressure Induced Topological Quantum Phase Transition in Weyl Semimetal Td-MoTe2


Guguchia, Zurab; dos Santos, Antonio M; Von Rohr, Fabian; Molaison, Jamie J; Banerjee, Soham; Rhodes, Daniel; Yin, Jiaxin; Khasanov, Rustem; Hone, James; Uemura, Yasutomo J; Hasan, M Zahid; Luetkens, Hubertus; Bozin, Emil S; Amato, Alex (2020). Pressure Induced Topological Quantum Phase Transition in Weyl Semimetal Td-MoTe2. Journal of the Physical Society of Japan, 89(9):094707.

Abstract

We report the temperature and pressure (pmax≃1.5 GPa) evolution of the crystal structure of the Weyl semimetal Td-MoTe2 by combination of neutron diffraction and the X-ray total scattering experiments. We find that the fundamental non-centrosymmetric structure Td is fully suppressed and transforms into a centrosymmertic 1T′ structure at a critical pressure of pcr ∼ 1.2–1.4 GPa. This is strong evidence for a pressure induced quantum phase transition (QPT) between topological to a trivial electronic state. Although the topological QPT has strong effect on magnetoresistance, it is interesting that the superconducting (SC) critical temperature Tc, the superfluid density, and the SC gap all change smoothly and continuously across pcr and no sudden effects are seen concomitantly with the suppression of the Td structure. This implies that the Tc, and thus the SC pairing strength, is unaffected by the topological QPT. However, the QPT requires the change in the SC gap symmetry from non-trivial s+− to a trivial s++ state, which we discuss in this work. Our systematic characterizations of the structure and SC properties associated with the topological QPT provide deep insight into the pressure induced phase diagram in this topological quantum material.

Abstract

We report the temperature and pressure (pmax≃1.5 GPa) evolution of the crystal structure of the Weyl semimetal Td-MoTe2 by combination of neutron diffraction and the X-ray total scattering experiments. We find that the fundamental non-centrosymmetric structure Td is fully suppressed and transforms into a centrosymmertic 1T′ structure at a critical pressure of pcr ∼ 1.2–1.4 GPa. This is strong evidence for a pressure induced quantum phase transition (QPT) between topological to a trivial electronic state. Although the topological QPT has strong effect on magnetoresistance, it is interesting that the superconducting (SC) critical temperature Tc, the superfluid density, and the SC gap all change smoothly and continuously across pcr and no sudden effects are seen concomitantly with the suppression of the Td structure. This implies that the Tc, and thus the SC pairing strength, is unaffected by the topological QPT. However, the QPT requires the change in the SC gap symmetry from non-trivial s+− to a trivial s++ state, which we discuss in this work. Our systematic characterizations of the structure and SC properties associated with the topological QPT provide deep insight into the pressure induced phase diagram in this topological quantum material.

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Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Department of Chemistry
07 Faculty of Science > Physics Institute
Dewey Decimal Classification:540 Chemistry
Scopus Subject Areas:Physical Sciences > General Physics and Astronomy
Uncontrolled Keywords:General Physics and Astronomy
Language:English
Date:15 September 2020
Deposited On:05 Feb 2021 07:07
Last Modified:06 Feb 2021 21:03
Publisher:The Physical Society of Japan
ISSN:0031-9015
OA Status:Closed
Publisher DOI:https://doi.org/10.7566/jpsj.89.094707
Project Information:
  • : FunderSNSF
  • : Grant IDP300P2_177832
  • : Project TitleUntangling Superconducting, Magnetic and Charge Orders of the strongly correlated and topologically non-trivial materials: Uniaxial Strain and Hydrostatic pressure effects
  • : FunderSNSF
  • : Grant IDPZ00P2_174015
  • : Project TitleChemistry and Physics of Nitride Based Materials

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Embargo till: 2021-11-01