Nature of the tensor order in Cd2Re2O7

Di Matteo, S.; Norman, M. R.

doi:10.1103/PhysRevB.96.115156

Title: Nature of the tensor order in ${Cd}_{2} {Re}_{2} O_{7}$

Journal Article · Fri Sep 01 00:00:00 EDT 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.115156· OSTI ID:1416023

Di Matteo, S.; Norman, M. R.

The pyrochlore metal Cd₂Re₂O₇ has been recently investigated by second-harmonic generation (SHG) reflectivity. In this paper, we develop a general formalism that allows for the identification of the relevant tensor components of the SHG from azimuthal scans. We demonstrate that the secondary order parameter identified by SHG at the structural phase transition is the x² - y² component of the axial toroidal quadrupole. This differs from the 3z² - r² symmetry of the atomic displacements associated with the I4m2 crystal structure that was previously thought to be its origin. Within the same formalism, we suggest that the primary order parameter detected in the SHG experiment is the 3z² - r² component of the magnetic quadrupole. We discuss the general mechanism driving the phase transition in our proposed framework, and suggest experiments, particularly resonant x-ray scattering ones, that could clarify this issue.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

DOE Contract Number:: AC02-06CH11357

OSTI ID:: 1416023

Journal Information:: Physical Review B, Vol. 96, Issue 11; ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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