PL EN


Preferences help
enabled [disable] Abstract
Number of results
2010 | 118 | 5 | 969-970
Article title

Field-Dependent Specific Heat and Energy Gap in the Yb_4As_3 Compound

Authors
Content
Title variants
Languages of publication
EN
Abstracts
EN
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.
Keywords
Year
Volume
118
Issue
5
Pages
969-970
Physical description
Dates
published
2010-11
References
  • 1. M. Köppen, M. Lang, R. Helfrich, F. Steglich, P. Thalmeier, B. Schmidt, B. Wand, D. Pankert, H. Benner, H. Aoki, A. Ochiai, Phys. Rev. Lett. 82, 4548 (1999)
  • 2. M. Kohgi, K. Iwasa, J.-M. Mignot, B. Fak, P. Gegenwart, M. Lang, A. Ochiai, H. Aoki, T. Suzuki, Phys. Rev. Lett. 86, 2439 (2001)
  • 3. N. Shibata, K. Ueda, J. Phys. Soc. Jpn. 70, 3690 (2001)
  • 4. G. Kamieniarz, R. Matysiak, P. Gegenwart, H. Aoki, A. Ochiai, J. Magn. Magn. Mater. 290-291, 353 (2005)
  • 5. G. Kamieniarz, R. Matysiak, P. Gegenwart, H. Aoki, A. Ochiai, Inorg. Chim. Acta 360, 3955 (2007)
  • 6. R. Matysiak, G. Kamieniarz, P. Gegenwart, A. Ochiai, Phys. Rev. B 79, 224413 (2009)
  • 7. F. Steglich, M. Köppen, P. Gegenwart, T. Cichorek, B. Wand, M. Lang, P. Thalmeier, B. Schmidt, H. Aoki, A. Ochiai, Acta Phys. Pol. A 97, 91 (2000)
Document Type
Publication order reference
YADDA identifier
bwmeta1.element.bwnjournal-article-appv118n5104kz
Identifiers
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.