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Abstracts
We report the low-temperature specific-heat simulation results and reanalyzed measurement data on polydomain Yb_4As_3 in magnetic fields B = 0 and 6 T. The data considered here are independent and supplement those considered earlier. A quantitative agreement has again been achieved between the magnetic experimental specific-heat data and the numerical results obtained by the quantum transfer-matrix simulation technique, yielding a new evidence in favour of the Heisenberg model of the antiferromagnetic spin S = 1/2 chain with the value of the exchange integral J/k_{B} = - 28 K. The finite-size quantum transfer matrix approximants have been extrapolated exploiting the procedure developed previously. On the basis of the data in magnetic field and using the corresponding density-matrix renormalization group results, the energy-gap size Δ has been estimated for the applied magnetic field B = 6 T, leading to the experimental verification in the extended region of the scaling law Δ ∿ B^{2/3} following from the sine-Gordon model.
Discipline
Journal
Year
Volume
Issue
Pages
969-970
Physical description
Dates
published
2010-11
Contributors
author
- Institute of Engineering and Computer Education, University of Zielona Góra, Prof. Z. Szafrana 4, 65-516 Zielona Góra, Poland
References
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- 6. R. Matysiak, G. Kamieniarz, P. Gegenwart, A. Ochiai, Phys. Rev. B 79, 224413 (2009)
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Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv118n5104kz