Non-equilibrium dynamics in geometrically frustrated spin glass Bi2Fe3GaO9 with a Cairo lattice

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Abstract
We have explored the magnetic relaxation of the spin glass phase in Bi2Fe3GaO9, a geometrically frustrated magnet with a unique Cairo lattice made of pentagonal building blocks. Using dc magnetization measurements, we find the relaxation behavior in single crystals follows the Arrhenius law as a function of temperature but remains relatively constant under different magnetic fields. Through a carefully designed protocol, we observe significant rejuvenation and memory effects, reminiscent of classical dilute spin glasses rather than spin jamming systems. Our finding suggests that Bi2Fe3GaO9 is probably located in the crossover between conventional spin glass and perfect spin jam and thus provides an excellent platform for investigating the evolution of underlying magnetic structure, paving the way for further neutron scattering research.
Funding Information
  • U.S. Department of Energy > Office of Science > Basic Energy Sciences

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