Magnetic torque in spin-orbit coupled metal Cd<sub>2</sub>Re<sub>2</sub>O<sub>7</sub>
ORAL
Abstract
Spin-orbit (SO) interactions lead to peculiar symmetry-broken phases in highly correlated systems. Among various SO coupled metals, a metallic pyrochlore Cd2Re2O7 is known to show unique multipole orders associated with the inversion symmetry breaking below ~200 K, whose order parameter has Eu symmetry. We have measured the magnetic torque of Cd2Re2O7 in a wide temperature and field range. We find that a four-fold symmetry of the magnetic torque signal as well as a two-fold symmetry is significantly enhanced at low temperatures below ~200 K. The symmetry analysis of the torque signal strongly suggests the presence of the primary order parameter (OP) with the even parity Eg symmetry, which induces the four-fold term, whereas the two-fold arises from the odd parity Eu OP. It is very likely that the Eg symmetry OP is purely of electronic origin and the coexistence with the odd-parity Eu OP provides important insights into the origin of the multipole orders induced by the SO coupling.
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Presenters
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Shinya Uji
- National Institute for Materials Science
- Quantum Transport Properties Group, National Institute for Materials Science (NIMS), Tsukuba 305-0003, Japan