Spin dynamics of the quantum dipolar magnet Yb${}_3$Ga${}_5$O${}_{12}$ in an external field

Abstract

We investigate ytterbium gallium garnet Yb${}_3$Ga${}_5$O${}_{12}$ in the paramagnetic phase above the supposed magnetic transition at $T_{\lambda }\approx 54$ mK. Our study combines susceptibility and specific heat measurements with neutron scattering experiments and theoretical calculations. Below 500 mK, the elastic neutron response is strongly peaked in the momentum space. Along with that the inelastic spectrum develops flat excitation modes. In magnetic field, the lowest energy branch follows a Zeeman shift in accordance with the field-dependent specific heat data. An intermediate state with spin canting away from the field direction is evidenced in small magnetic fields. In the field of 2 T, the total magnetization almost saturates and the measured excitation spectrum is well reproduced by the spin-wave calculations taking into account solely the dipole-dipole interactions. The small positive Curie-Weiss temperature derived from the susceptibility measurements is also accounted for by the dipole spin model. Altogether, our results suggest that Yb${}_3$Ga${}_5$O${}_{12}$ is a quantum dipolar magnet.

arXiv comment12 pages, 10 figures

References in corpus (14)

• Quantum Spin Liquids
• Magnetic and Thermodynamic Properties of the Collective Paramagnet-Spin Liquid Pyrochlore Tb2Ti2O7
• Enhanced magnetocaloric effect in frustrated magnets
• Frustrated magnet for adiabatic demagnetization cooling to milli-Kelvin temperatures
• Magnetocaloric effect in pyrochlore antiferromagnet Gd2Ti2O7
• Super-heavy fermion material as metallic refrigerant for adiabatic demagnetization cooling
• Magnetocaloric Study of Spin Relaxation in `Frozen' Dipolar Spin Ice Dy2Ti2O7
• Absence of magnetic order in Yb3Ga5O12: relation between phase transition and entropy in geometrically frustrated materials
• Dispersionless spin waves in Gadolinium Gallium Garnet
• Updating the phase diagram of the archetypal frustrated magnet Gd3Ga5O12
• Magnetic order and single-ion anisotropy in Tb${}_3$Ga${}_5$O${}_{12}$
• Crystal fields and magnetic structure of the Ising antiferromagnet Er${}_3$Ga${}_5$O${}_{12}$
• Field induced magnetic order in the frustrated magnet Gadolinium Gallium Garnet
• Low temperature spin fluctuations in geometrically frustrated Yb3Ga5O12

Cited by in corpus (4)

• Spin excitations in the quantum dipolar magnet Yb(BaBO${}_3$)${}_3$
• A Candidate for the Quantum Spin Liquid Ground-State in the Shastry-Sutherland Lattice Material Yb${}_2$Be${}_2$GeO${}_7$
• Microscopic spin Hamiltonian for a dipolar-Heisenberg magnet LiGdF4 from EPR measurements
• Uncommon magnetic ordering in the quantum magnet Yb${}_3$Ga${}_5$O${}_{12}$