Crystal Shape-Dependent Magnetic Susceptibility and Curie Law Crossover in the Spin Ices Dy2Ti2O7 and Ho2Ti2O7

Abstract

We present an experimental determination of the isothermal magnetic susceptibility of the spin ice materials Dy2Ti2O7 and Ho2Ti2O7 in the temperature range 1.8-300 K. The use of spherical crystals has allowed the accurate correction for demagnetizing fields and allowed the true bulk isothermal susceptibility X_T(T) to be estimated. This has been compared to a theoretical expression based on a Husimi tree approximation to the spin ice model. Agreement between experiment and theory is excellent at T > 10 K, but systematic deviations occur below that temperature. Our results largely resolve an apparent disagreement between neutron scattering and bulk measurements that has been previously noted. They also show that the use of non-spherical crystals in magnetization studies of spin ice may introduce very significant systematic errors, although we note some interesting - and possibly new - systematics concerning the demagnetizing factor in cuboidal samples. Finally, our results show how experimental susceptibility measurements on spin ices may be used to extract the characteristic energy scale of the system and the corresponding chemical potential for emergent magnetic monopoles.

11 pages, 3 figures 1 table. Manuscript submitted

References in corpus (9)

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Cited by in corpus (15)

• Crystal field parameters of the rare earth pyrochlores $R_2$Ti${}_2$O${}_7$ ($R$ = Tb, Dy, Ho)
• Experimental signature of the attractive Coulomb force between positive and negative magnetic monopoles in spin ice
• Special temperatures in frustrated ferromagnets
• Curie-law crossover in spin liquids
• Dynamic behavior of magnetic avalanches in the spin-ice compound Dy${}_2$Ti${}_2$O${}_7$
• Microscopic Aspects of Magnetic Lattice Demagnetizing Factors
• LiHoF${}_4$: Cuboidal Demagnetizing Factor in an Ising Ferromagnet
• Modification of Spin Ice Physics in Ho${}_2$Ti${}_2$O${}_7$ Thin Films
• Effects of uniaxial pressure on the spin ice Ho2Ti2O7
• Determination of the Entropy via Measurement of the Magnetization: Application to the Spin ice Dy2Ti2O7
• Screening and the Pinch Point Paradox in Spin Ice
• Low temperature crystal structure and local magnetometry for the geometrically frustrated pyrochlore Tb2Ti2O7
• Tunable critical correlations in kagome ice
• Experimental measurement of the isolated magnetic susceptibility
• Low-temperature high-frequency dynamic magnetic susceptibility of classical spin-ice Dy${}_2$Ti${}_2$O${}_7$