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

• Authors: R. Matysiak
• 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

EN

75.10.Jm; 75.40.Cx; 75.40.Mg; 71.55.Ak

Discipline

• 71.55.Ak: Metals, semimetals, and alloys
• 75.40.Mg: Numerical simulation studies
• 75.40.Cx: Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
• 75.10.Jm: Quantized spin models, including quantum spin frustration

• Journal: Acta Physica Polonica A
• Year: 2010
• Volume: 118
• Issue: 5
• Pages: 969-970

Dates

published

2010-11

Contributors

author

R. Matysiak

• Institute of Engineering and Computer Education, University of Zielona Góra, Prof. Z. Szafrana 4, 65-516 Zielona Góra, Poland

References

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Identifiers

DOI

10.12693/APhysPolA.118.969