Crystal-field study of magnetization and specific heat properties of frustrated pyrochlore Pr2Zr2O7

We report low-temperature magnetization and thermal expansion studies of single-crystal pyrochlore magnet Pr 2 Zr 2 O 7. The temperature dependence of the magnetic susceptibility shows no sign of magnetic ordering down to 2 K. The susceptibility exhibits Curie-Weiss behavior below 10 K, yielding an effective moment µ eff = 2.5 µ B and a Weiss temperature θ CW = 0.25 K. Under [111] magnetic fields, the field dependence of the magnetization exhibits a metamagnetic transition at B c = 2.1 T, indicating the transition from the spin-ice manifold to the polarized "3(1)-in,1(3)-out" state. The linear thermal expansion coefficient α measured along the [111] direction increases with decreasing temperature and forms a maximum at ~1.3 K. The observed maximum of α can possibly be attributed to the magneto-elastic coupling between magnetic monopoles and the lattice.

show abstract

“…1 (a). The negative θ CW indicates the antiferromagnetic interaction in the system, which is consistent with previous studies [13,21,22]. [23].…”

Section: Methodssupporting

confidence: 92%

Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr₂Zr₂O₇

Tang

Sakai

Kimura

et al. 2020

Proceedings of the International Conference on Strongly Correlated Electron Systems (SCES2019)

View full text Add to dashboard Cite

show abstract

“…This work is focused on Pr 2 Zr 2 O 7 -based pyrochlores, which have received considerable attention in the last decade. The magnetic properties of praseodymium zirconate and its solid solutions have been actively studied [15][16][17]. It has been found that Pr 2 Zr 2 O 7 -based pyrochlores (e.g.…”

Section: Introductionmentioning

confidence: 99%

Defect chemistry of pyrochlore Pr2O3-ZrO2 system: the relevant thermodynamic parameters

Abrantes,

Gomes,

Shlyakhtina

2024

J Solid State Electrochem

View full text Add to dashboard Cite

Materials of the system Pr2O3-ZrO2, namely the Pr2Zr2O7-based pyrochlores, have received considerable attention in the last decade, being a very interesting structure for defect chemistry because of its high solubility for various dopants, anti-site behaviour between A and B, and the multitude of possible combinations of A and B that are compatible in this type of structure. The compositions (Pr2-xZrx)Zr2O7+x/2 (x = 0.15), Pr2Zr2O7, and Pr2(Zr2-xPrx)O7-x/2 (x = 0.1), were prepared in previous works through the coprecipitation method and were characterised by impedance spectroscopy as a function of the oxygen partial pressure. In the present work, a defect chemistry model is proposed, and, based on the previously obtained experimental conductivity data, the relevant thermodynamic parameters were obtained by fitting, using a non-linear optimisation numerical method. The mobility of oxygen vacancies and interstitials oxygen were accurately determined, as well as the equilibrium constant of the formation of anti-Frenkel defects. It was observed that deviations from the stoichiometry promote an increase in ionic conductivity, respectively, 1.3x10-4, 1.4x10-3 and 1.7x10-2 S/cm, for the stoichiometric, excess of Pr and excess of Zr composition. The higher value obtained for the composition with an excess of Zr4+, suggests a higher interstitial oxygen mobility when compared with the oxygen vacancy mobility. It is also demonstrated that the novel applied methodology of fitting conductivity experimental data with an optimisation numerical method is suitable for determining the thermodynamically relevant parameters of defect chemistry models, allowing the prediction of material properties.

show abstract

Effect of the oxidation states on the electrical properties of Fe-doped Pr2Zr2O7 pyrochlore

Veiga

Fortuño-Morte

Beltrán‐Mir

2022

Journal of Materials Research and Technology

View full text Add to dashboard Cite

Crystal-field study of magnetization and specific heat properties of frustrated pyrochlore Pr2Zr2O7

Cited by 7 publications

References 46 publications

Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr₂Zr₂O₇

Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr₂Zr₂O₇

Defect chemistry of pyrochlore Pr2O3-ZrO2 system: the relevant thermodynamic parameters

Effect of the oxidation states on the electrical properties of Fe-doped Pr2Zr2O7 pyrochlore

Contact Info

Product

Resources

About

Crystal-field study of magnetization and specific heat properties of frustrated pyrochlore Pr2Zr2O7

Cited by 7 publications

References 46 publications

Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr2Zr2O7

Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr2Zr2O7

Defect chemistry of pyrochlore Pr2O3-ZrO2 system: the relevant thermodynamic parameters

Effect of the oxidation states on the electrical properties of Fe-doped Pr2Zr2O7 pyrochlore

Contact Info

Product

Resources

About

Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr₂Zr₂O₇

Magnetization and Thermal Expansion Properties of Quantum Spin Ice Candidate Pr₂Zr₂O₇