Tunable magnetic orders in CePd$_2$As$_{2-x}$P$_x$

T Shang; Y H Chen; W B Jiang; Y Chen; L Jiao; J L Zhang; Z F Weng; X Lu; H Q Yuan

doi:10.1088/0953-8984/26/4/045601

paper

Tunable magnetic orders in CePd $_{2}$ As $_{2 - x}$ P $_{x}$

arXiv:1312.6746 · doi:10.1088/0953-8984/26/4/045601

Abstract

We report the successful synthesis of the polycrystalline compounds CePd $_{2}$ As $_{2 - x}$ P $_{x}$ ( $0 \leq x \leq 2$ ) and their physical properties by measuring the transport, magnetic and thermodynamic behaviors as a function of temperature and/or magnetic field. Powder x-ray diffraction (XRD) indicates that CePd $_{2}$ As $_{2 - x}$ P $_{x}$ crystallizes in the ThCr $_{2}$ Si $_{2}$ -type tetragonal structure. CePd $_{2}$ As $_{2}$ exhibits a moderate Sommerfeld coefficient of $γ$ $\approx$ 88 mJ/mol-K $^{2}$ , and undergoes an antiferromagnetic (AFM) transition at the Néel temperature $T_{N} \approx$ 15 K. Upon substituting As with P, the $T_{N}$ is nearly unchanged up to $x ≃ 0.6$ , while a ferromagnetic (FM) transition develops below $T_{N}$ for $x ≃ 0.4$ . The Curie temperature $T_{C}$ increases with increasing $x$ and eventually merges with the AFM transition at $x ≃ 0.6$ . With further increase of $x$ , the system follows typical FM behaviors and its $T_{C}$ monotonically increases and reaches $T_{C} \approx 28$ K in CePd $_{2}$ P $_{2}$ . Moreover, a metamagnetic transition is observed in the As-rich samples, but vanishes for $x \geq 0.4$ . Such a tunable magnetic ground state may provide an opportunity to explore the possible quantum critical behavior in CePd $_{2}$ As $_{2 - x}$ P $_{x}$ .

13 pages, 8 figures

Tunable magnetic orders in CePd $_{2}$ As $_{2 - x}$ P $_{x}$

Abstract

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Tunable magnetic orders in CePd2​As2−x​Px​

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Tunable magnetic orders in CePd $_{2}$ As $_{2 - x}$ P $_{x}$