Magnon specific heat of high-TC parent compounds La _2CuO_4 and y Ba_2Cu_3O_6: Green's function approach

Rutonjski M.S.; Rado?evi? S.M.; Panti? M.R.Pavkov-Hrvojevi? M.V.Kapor D.V.?krinjar M.G.

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Magnon specific heat of high-TC parent compounds La _2CuO_4 and y Ba_2Cu_3O_6: Green's function approach

机译：Magnon specific heat of high-TC parent compounds La _2CuO_4 and y Ba_2Cu_3O_6: Green's function approach

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We calculate the temperature dependence of the magnon contribution to specific heat of the high-TC superconducting parent compounds La _2CuO_4 and Y Ba_2Cu_3O_6 using the Green's function (GF) method within the Tyablikov's approximation (RPA). By making use of quantum Heisenberg S=12 three-dimensional antiferromagnetic model, we obtain the specific heat temperature dependence in the whole temperature range from absolute zero to the Nel temperature. The analysis performed for La_2CuO_4 suggests that the magnon contribution to the total specific heat measured in the experiment is small, but not negligible as predicted by the simplified two-dimensional model often used within the linear spin-wave (LSW) theory. This discrepancy originates from the renormalization of the magnon energies due to the RPA in GF approach. Further, we discuss the influence of the in-plane frustration and the three-dimensionality of the system on the magnon specific heat in La _2CuO_4. We study the low-temperature behavior of the specific heat as well as the behavior in the vicinity of the Nel temperature which gives for the critical exponent α value α=-12. Finally, we tend to improve the LSW theory results found in the literature by applying that theory to the three-dimensional orthorhombic model with second- and third-neighbor exchange interaction.

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来源
《Solid State Communications》 |2011年第7期|518-522|共5页
作者
Rutonjski M.S.; Rado?evi? S.M.; Panti? M.R.Pavkov-Hrvojevi? M.V.Kapor D.V.?krinjar M.G.;
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Department of Physics, Faculty of Sciences, University of Novi Sad, Trg Dositeja Obradovi?a 4, Novi Sad, Serbia;

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正文语种英语
中图分类固体物理学;
关键词
A. High-T_C superconductor parent compounds; A. Quasi-two-dimensional antiferromagnetic copper oxides; D. Magnon specific heat in Green's function approach;

Magnon specific heat of high-TC parent compounds La _2CuO_4 and y Ba_2Cu_3O_6: Green's function approach

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