Kondo behaviour in an extremely low carrier concentration system: CeP

doi:10.1016/0921-4526(91)90541-L

Physica B: Condensed Matter

Volume 171, Issues 1–4, 1 May 1991, Pages 324-328

https://doi.org/10.1016/0921-4526(91)90541-L Get rights and content

Abstract

Electrical resistivity, magnetic susceptibility and specific heat under a magnetic field were measured in single crystalline CeP. The exerpiments show a Kondo behaviour of the system caused by a Γ₈ exited state at high temperatures, and a large mass enhancement caused by a Γ₇ ground state at low temperatures. An interesting magnetic phase diagram was also obtained.

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The transport, magnetic and thermodynamic properties of the cerium oxide bismuth compound Ce₂O₂Bi are systematically investigated in a wide temperature regime. The compound crystallizes in the anti-ThCr₂Si₂-type structure consisting of a separated Bi²⁻ square net layer between the CeO layers. In the high temperature regime 200–300 K, the compound shows the conventional metallic behavior and localized $4 f$ electrons of Ce³⁺ ions. In the low temperature regime 15–30 K, the resistivity increases with a logarithmic temperature dependence, accompanied with the negative magnetoresistance and a low carrier density. Further decreasing temperature, the resistivity drops rapidly below 6.2 K, signaling an antiferromagnetic ordering transition within the Kondo phase. Both susceptibility and specific heat display a similar transition around the same temperature, accompanied with a reduced magnetic entropy. A large Sommerfeld coefficient $\sim$ 336 mJ/mol K² is obtained by fitting the specific heat data and no superconductivity is observed down to 0.3 K. All these observations suggest that Ce₂O₂Bi is a rare low carrier density Kondo lattice compound whose interlayer hybridization between $4 f$ electrons of Ce³⁺ ions and conduction $6 p$ electrons of Bi²⁻ ions plays a crucial role.
High field magnetic phase diagram of CeP studied by synchrotron radiation X-ray diffraction
2004, Journal of Magnetism and Magnetic Materials
Magnetic structures of CeP have been studied under high magnetic fields up to $12.5 T (H|| [1 1 ̄ 0])$ by synchrotron X-ray diffraction. Magnetic phases with wave vectors $k= 211$ , $210$ and $29$ were observed at low temperatures. The magnetic phases with $k= 29$ (↑↑∘∘∘∘∘∘∘ or ↑↑←→←→←→←) and $k= 211$ (↑↑∘∘∘∘∘∘∘∘∘) are new phases under magnetic field found in the present work.
Magnetotransport studies of the low-carrier-density semimetal CeP
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Magnetoelastic properties of CeP
1998, Journal of Magnetism and Magnetic Materials
Magnetoelastic properties of a single crystal of CeP have been investigated by magnetostriction and thermal expansion measurements. The longitudinal magnetostriction at 4.2 K shows an abrupt decrease in length around 0.5 T with a large hysteresis in the virgin cycle. Moreover, iso-field thermal expansion shows a large increase of the length at the temperature where the ferromagnetic-paramagnetic transition takes place. Such large length changes can be understood by the p-f mixing effect which has been used successfully to explain the magnetic phase diagram of CeP.
High magnetic field dHvA effect measurements of CeP
1998, Journal of Magnetism and Magnetic Materials
The AC susceptibility of CeP has been measured for the magnetic field in the (0 1 0) plane up to 20 T, and the de Haas-van Alphen (dHvA) oscillations have been observed in all three magnetic phases below 20 T. The dHvA frequencies in the highest-field phase and their angle dependence are discussed in connection with successive metamagnetic transitions above 20 T. Spiky signals in the susceptibility observed only at 0.03 K are also discussed.
<sup>77</sup>Se NMR study of CeSe
1997, Physica B: Condensed Matter

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Kondo behaviour in an extremely low carrier concentration system: CeP

Abstract

J. Magn. & Magn. Mater.

Solid State Commun.

J. Magn. & Magn. Mater.

J. Magn. & Magn. Mater.