Magnetic properties and crystal field in Pr$_2$ Zr$_2$ O$_7$

P. Bonville; S. Guitteny; A. Gukasov; I. Mirebeau; S. Petit; C. Decorse; M. Ciomaga Hatnean; G. Balakrishnan

Magnetic properties and crystal field in Pr$_2$ Zr$_2$ O$_7$

P. Bonville ¹ S. Guitteny ² A. Gukasov ² I. Mirebeau ^{2, *} S. Petit ² C. Decorse ³ M. Ciomaga Hatnean ⁴ G. Balakrishnan ⁴

* Corresponding author

1 LNO - Laboratoire Nano-Magnétisme et Oxydes

SPEC - UMR3680 - Service de physique de l'état condensé, IRAMIS - Institut Rayonnement Matière de Saclay

2 LLB - UMR 12 - Laboratoire Léon Brillouin

3 LPCES, ICMMO - Laboratoire Physicochimique Etat Solide, UMR 8648,CNRS

4 Department of Physics [Coventry]

Abstract : In this work, we revisit the crystal field acting on the non-Kramers Pr$^{3+}$ ion (4f$^2$) in the quantum spin-ice candidate Pr$_2$ Zr$_2$ O$_7$ using both a standard calculation restricted to the ground spin-orbit multiplet and intermediate coupling states in the full basis of the f$^2$ configuration. Analysis of the thermal variation of the polycrystal magnetic susceptibility and of the local susceptibilities $\chi$⊥ and $\chi _\parallel$ determined by means of polarized neutron diffraction experiments reveals that the effective antiferromagnetic exchange is strongly depleted at low temperature with respect to its high-temperature value. We then discuss the influence of crystal field imperfections arising from residual strains, which are especially important for a non-Kramers ion. We find that they are an essential ingredient to account for the very low temperature $M(H)$ magnetization curves, showing that the saturation is not achieved even at 8 T. Furthermore, as possible candidates to qualitatively understand the Curie-like behavior observed below 0.5 K, we discuss the influence of the magnetic hyperfine interaction.

Document type :

Journal articles

Domain :

Physics [physics]

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