Low-temperature magnetic, thermodynamic, and transport properties of antiferromagnetic CeAuSn single crystals

We present measurements of the magnetization M, specific heat C, resistivity [rho], and magnetoresistance MR of single-crystalline hexagonal CeAuSn for temperature down to T = 1.6 K and in magnetic field up to B = 12 T. Antiferromagnetic ordering at T sub(N) = 4.4 K is observed as previously found f...

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Bibliographic Details
Published in:Physical review. B, Condensed matter and materials physics Condensed matter and materials physics, 2015-04, Vol.91 (14), Article 144413
Main Authors: Huang, C. L., Fritsch, V., Pilawa, B., Yang, C. C., Merz, M., Löhneysen, H. v.
Format: Article
Language:English
Subjects:
Anisotropy
Antiferromagnetism
Condensed matter
Ferromagnetism
Magnetization
Orbitals
Order disorder
Single crystals
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Summary:We present measurements of the magnetization M, specific heat C, resistivity [rho], and magnetoresistance MR of single-crystalline hexagonal CeAuSn for temperature down to T = 1.6 K and in magnetic field up to B = 12 T. Antiferromagnetic ordering at T sub(N) = 4.4 K is observed as previously found for polycrystalline samples. A strong magnetic easy-plane anisotropy of M for B perpendicular and parallel to the c direction is found with in M sub([perpendicular])/M sub(||) approximately 15 in B = 0.1 T around T sub(N), which is attributed to crystal-electric-field anisotropy. The analysis of the magnetic susceptibility indicates ferromagnetic correlations above T sub(N). Measurements of M(T) under hydrostatic pressure P show that T sub(N)(P) increases linearly with P at a small rate of 0.035 K/kbar up to 4 kbar and gradually saturates approaching P = 16 kbar. Zero-field Delta C/T, the phonon contribution to C being subtracted, is proportional to T super(2) below T sub(N) indicating a gapless spinwave spectrum. It is found that all Delta C(T, B)/T curves for B = 0-9 T cross at the same temperature, providing an example of a particularly well defined isosbestic point in a very narrow region around T sub(iso) = 6.6 K. Finally, [rho](T) and MR experiments with current perpendicular and parallel to B allow us to separate orbital effects from the Zeeman splitting.
ISSN:1098-0121
1550-235X
DOI:10.1103/PhysRevB.91.144413