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Correlation between electronic and structural orders in 1T − TiSe2

DOI: 10.1103/PhysRevResearch.3.L022003 DOI Help

Authors: Hiroki Ueda (Swiss Light Source) , Michael Porer (Swiss Light Source) , Jose R. L. Mardegan (Swiss Light Source) , Sergii Parchenko (Swiss Light Source) , Namrata Gurung (Paul Scherrer Institute; ETH Zurich) , Federica Fabrizi (Diamond Light Source) , Mahesh Ramakrishnan (Swiss Light Source) , Larissa Boie (ETH Zurich) , Martin Josef Neugebauer (ETH Zurich) , Bulat Burganov (ETH Zurich) , Max Burian (Swiss Light Source) , Steven Lee Johnson (ETH Zurich; Paul Scherrer Institute) , Kai Rossnagel (Christian-Albrechts-Universität zu Kiel; Deutsches Elektronen-Synchrotron DESY) , Urs Staub (Swiss Light Source)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Physical Review Research , VOL 3

State: Published (Approved)
Published: April 2021
Diamond Proposal Number(s): 15742

Open Access Open Access

Abstract: The correlation between electronic and crystal structures of 1T − TiSe2 in the charge-density wave (CDW) state is studied by x-ray diffraction in order to clarify basic properties in the CDW state, transport properties, and chirality. Three families of reflections are used to probe atomic displacements and the orbital asymmetry in Se. Two distinct onset temperatures are found: T CDW and a lower T ∗ indicative for an onset of Se out-of-plane atomic displacements. T ∗ coincides with a DC resistivity maximum and the onset of the proposed gyrotropic (chiral) electronic structure. However, no indication for chirality is found. The relation between the atomic displacements and the transport properties is discussed in terms of Ti 3 d and Se 4 p states that only weakly couple to the CDW order.

Journal Keywords: Charge density waves; Crystal symmetry; Electrical conductivity; Structural order parameter; Transition-metal dichalcogenide

Subject Areas: Materials, Physics

Instruments: I16-Materials and Magnetism

Other Facilities: X04SA at Swiss Light Source

Added On: 13/04/2021 14:36


Discipline Tags:

Quantum Materials Hard condensed matter - electronic properties Physics Materials Science

Technical Tags:

Diffraction Single Crystal X-ray Diffraction (SXRD)