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Low-temperature specific heat of non-charge ordered Yb4(As0.36Sb0.64)3 and (Yb0.87Lu0.13)4As3

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Cichorek,  T.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Aoki,  H.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Gegenwart,  P.
Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Lang,  M.
Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Steglich,  F.
Frank Steglich, Physics of Quantum Materials, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Cichorek, T., Aoki, H., Gegenwart, P., Lang, M., Ochiai, A., & Steglich, F. (2002). Low-temperature specific heat of non-charge ordered Yb4(As0.36Sb0.64)3 and (Yb0.87Lu0.13)4As3. Physica B, 312, 370-372. doi:10.1016/S0921-4526(01)01125-5.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0015-3183-F
Abstract
Most of the unusual low-T properties of Yb4As3, including a large specific-heat coefficient C(T)/T similar or equal to 200 mJ/K(2)mol, result from the one-dimensional S = 1/2 antiferromagnetism caused by the formation of Yb3+ chains below the charge- ordering transition. On the other hand, large C(T)/T values for non-charge ordered Yb-4(As0.36Sb0.64)(3) and (Yb0.87Lu0.13)(4)As-3 have also been reported. In order to clarify similarities and differences in the low-T specific heat between the 64% Sb- and 13% Lu-doped systems and pure Yb4As3, measurements down to 0.06 K in magnetic fields up to 10T have been performed. The experiments reveal spin-glass freezing around 0.1 and 0.4K for Yb-4(As0.36Sb0.64)(3) and (Yb0.87Lu0.13)(4)As-3, respectively, that also affects their thermodynamic properties at higher temperatures. (C) 2002 Elsevier Science B.V. All rights reserved.