Formation and Control of Twin Domains in the Pyrochlore Oxide Cd2Re2O7

Abstract

The successive phase transitions of the pyrochlore oxide Cd2Re2O7 are studied by polarizing microscopy and magnetic susceptibility measurements. The formation of twin domains is visualized in the polarizing images of a pristine (111) crystal surface upon cooling through the cubic-to-tetragonal transition at Ts1 ~ 200 K. Moreover, a dramatic change in the twinning pattern is observed at Ts2 ~120 K, which suggests that the tetragonal c axis flips as the strain changes its direction at the tetragonal-to-tetragonal transition. Magnetic susceptibility measurements reveal significant domain alignment upon cooling across Ts1 and Ts2 in a magnetic field of 7 T, which are due to ~10% anisotropy in the magnetic susceptibility for the low-temperature phases. Interestingly, the anisotropy is reversed at Ts2: \c{hi}c < \c{hi}a above Ts2 and vice versa below Ts2.

arXiv comment8 pages, 7 figures, J. Phys. Soc. Jpn, in press

References in corpus (10)

• Parity-breaking phases of spin-orbit-coupled metals with gyrotropic, ferroelectric and multipolar orders
• A parity-breaking electronic nematic phase transition in the spin-orbit coupled metal Cd${}_2$Re${}_2$O${}_7$
• Low Temperature Symmetry of Pyrochlore Oxide Cd2Re2O7
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• Structural Order Parameter in the Pyrochlore Superconductor Cd2Re2O7
• The nature of the tensor order in Cd2Re2O7
• Evidence of an improper displacive phase transition in Cd${}_2$Re${}_2$O${}_7$ via time-resolved coherent phonon spectroscopy
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• Structural order parameter and itinerant electron magnetism in Cd2Re2O7

Cited by in corpus (6)

• Electric Toroidal Quadrupoles in Spin-Orbit Coupled Metal Cd${}_2$Re${}_2$O${}_7$
• Unified description of electronic orderings and cross correlations by complete multipole representation
• Antisymmetric Thermopolarization by Electric Toroidicity
• Crystal structure of the inversion-breaking metal Cd2Re2O7
• Successive phase transitions of the spin-orbit-coupled metal Cd2Re2O7 probed by high-resolution synchrotron x-ray diffraction
• Domain Control by Adjusting Anisotropic Stress in Pyrochlore Oxide Cd2Re2O7