Magnetic properties and crystal field in Pr$_2$ Zr$_2$ O$_7$ - Archive ouverte HAL Access content directly
Journal Articles Physical Review B: Condensed Matter and Materials Physics (1998-2015) Year : 2016

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

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P. Bonville
• Function : Author
S. Guitteny
• Function : Author
A. Gukasov
• Function : Author
I. Mirebeau
• Function : Correspondent author
• PersonId : 990190

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S. Petit
C. Decorse
• Function : Author
M. Ciomaga Hatnean
• Function : Author
G. Balakrishnan

#### 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.

#### Domains

Physics [physics]

### Dates and versions

cea-01550625 , version 1 (29-06-2017)

### Identifiers

• HAL Id : cea-01550625 , version 1
• DOI :

### Cite

P. Bonville, S. Guitteny, A. Gukasov, I. Mirebeau, S. Petit, et al.. Magnetic properties and crystal field in Pr$_2$ Zr$_2$ O$_7$. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2016, 94, pp.134428. ⟨10.1103/PhysRevB.94.134428⟩. ⟨cea-01550625⟩

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