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

Huang, C. L., Fritsch, V., Pilawa, B., Yang, C. C., Merz, M., & Löhneysen, H. v. (2015). Low-temperature magnetic, thermodynamic, and transport properties of antiferromagnetic CeAuSn single crystals. Physical Review B, 91(14): 144413, pp. 1-9. doi:10.1103/PhysRevB.91.144413.

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Huang, C. L.1, Author              
Fritsch, V.2, Author
Pilawa, B.2, Author
Yang, C. C.2, Author
Merz, M.2, Author
Löhneysen, H. v.2, Author
Affiliations:
1Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society, ou_1863445              
2External Organizations, ou_persistent22              

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 Abstract: We present measurements of the magnetization M, specific heat C, resistivity., 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-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 M-perpendicular to/M-parallel to approximate to 15 in B = 0.1 T around T-N, which is attributed to crystal-electric-field anisotropy. The analysis of the magnetic susceptibility indicates ferromagnetic correlations above T-N. Measurements of M(T) under hydrostatic pressure P show that T-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-2 below T-N indicating a gapless spin-wave 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-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.

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Language(s): eng - English
 Dates: 2015-04-16
 Publication Status: Published in print
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Title: Physical Review B
  Abbreviation : Phys. Rev. B
Source Genre: Journal
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Publ. Info: Woodbury, NY : American Physical Society
Pages: - Volume / Issue: 91 (14) Sequence Number: 144413 Start / End Page: 1 - 9 Identifier: ISSN: 1098-0121
CoNE: https://pure.mpg.de/cone/journals/resource/954925225008