Experimental identification of electric dipoles induced by magnetic monopoles in Tb2Ti2O7
arXiv:1909.13199 · doi:10.1103/PhysRevLett.124.087601
Abstract
The fundamental principles of electrodynamics allow an electron carrying both electric monopole (charge) and magnetic dipole (spin) but prohibit its magnetic counterpart. Recently it was predicted that the magnetic "monopoles" carrying emergent magnetic charges in spin ice systems can induce electric dipoles. The inspiring prediction offers a novel way to study magnetic monopole excitations and magnetoelectric coupling. However, no clear example has been identified up to now. Here, we report the experimental evidence for electric dipoles induced by magnetic monopoles in spin frustrated Tb2Ti2O7. The magnetic field applied to pyrochlore Tb2Ti2O7 along [111] direction, brings out a "3-in-1-out" magnetic monopole configuration, and then induces a subtle structural phase transition at Hc~2.3 T. The transition is evidenced by the non-linear phonon splitting under magnetic fields and the anomalous crystal-field excitations of Tb3+ ions. The observations consistently point to the displacement of the oxygen O" anions along [111] axis which gives rise to the formation of electric dipoles. The finding demonstrates that the scenario of magnetic monopole having both magnetic charge and electric dipole is realized in Tb2Ti2O7 and sheds light into the coupling between electricity and magnetism of magnetic monopoles in spin frustrated systems.
References in corpus (26)
- Spin current and magneto-electric effect in non-collinear magnets
- Magnetic Monopoles in Spin Ice
- Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
- Magnetic Pyrochlore Oxides
- Multiferroic materials and magnetoelectric physics: symmetry, entanglement, excitation, and topology
- Ferroelectricity in the Magnetic E-Phase of Orthorhombic Perovskites
- Magnetic and Thermodynamic Properties of the Collective Paramagnet-Spin Liquid Pyrochlore Tb2Ti2O7
- Dynamically-Induced Frustration as a Route to a Quantum Spin Ice State in Tb2Ti2O7 via Virtual Crystal Field Excitations and Quantum Many-Body Effects
- Bond electronic polarization induced by spin
- Thermal Hall conductivity in the frustrated pyrochlore magnet Tb2Ti2O7
- Phonon and crystal field excitations in geometrically frustrated rare earth titanates
- Magnetoelastic excitations in the pyrochlore spin liquid TbTiO
- Femtoscale magnetically induced lattice distortions in multiferroic TbMnO3
- Electric dipoles on magnetic monopoles in spin ice
- Crystal field parameters of the rare earth pyrochlores TiO ( = Tb, Dy, Ho)
- Single crystal growth of the pyrochlores TiO ( = rare earth) by the optical floating-zone method
- Antiferromagnetic Spin Ice Correlations at (1/2,1/2,1/2) in the Ground State of the Pyrochlore Magnet Tb2Ti2O7
- Spin liquid correlations, anisotropic exchange and symmetry breaking in Tb2Ti2O7
- Magnetoelastics of a spin liquid: X-ray diffraction studies of Tb2Ti2O7 in pulsed magnetic fields
- Crystal field states of Tb3+ in the pyrochlore spin liquid Tb2Ti2O7 from neutron spectroscopy
- Observing Monopoles in a Magnetic Analog of Ice
- Vibrating-coil magnetometry of the spin liquid properties of Tb2Ti2O7
- Multiferroicity in spin ice: towards a magnetic crystallography of Tb2Ti2O7 in a field
- Critical speeding-up near the monopole liquid-gas transition in magnetoelectric spin-ice
- Crystal Field and Magnetoelastic Interactions in Tb2Ti2O7
- Double-layered monopolar order in Tb2Ti2O7 spin liquid
Cited by in corpus (6)
- Multiferroics and beyond: electric properties of different magnetic textures
- Low Energy Magneto-optics of TbTiO in [111] Magnetic Field
- Electric activity at magnetic moment fragmentation in spin ice
- Lattice dynamics and spin-phonon coupling in the kagome spin ice HoAgGe
- Exploring possible magnetic monopoles-induced magneto-electricity in spin ices
- Spin and quadrupole correlations by three-spin interaction in the frustrated pyrochlore magnet TbTiO