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Journal of Low Temperature Physics

, Volume 187, Issue 5–6, pp 712–718 | Cite as

Magnetic Signatures of Quantum Critical Points of the Ferrimagnetic Mixed Spin-(1/2, S) Heisenberg Chains at Finite Temperatures

Article

Abstract

Magnetic properties of the ferrimagnetic mixed spin-(1/2,S) Heisenberg chains are examined using quantum Monte Carlo simulations for two different quantum spin numbers \(S=1\) and 3/2. The calculated magnetization curves at finite temperatures are confronted with zero-temperature magnetization data obtained within the density matrix renormalization group method, which imply an existence of two quantum critical points determining a breakdown of the gapped Lieb–Mattis ferrimagnetic phase and Tomonaga–Luttinger spin-liquid phase, respectively. While a square root behavior of the magnetization accompanying each quantum critical point is gradually smoothed upon rising temperature, the susceptibility and isothermal entropy change data at low temperatures provide a stronger evidence of the zero-temperature quantum critical points through marked local maxima and minima, respectively.

Keywords

Ferrimagnetic Heisenberg chains Quantum critical point Quantum Monte Carlo 

Notes

Acknowledgments

This work was financially supported by the Grant of The Ministry of Education, Science, Research and Sport of the Slovak Republic under the Contract No. VEGA 1/0043/16, as well as, by Grants of the Slovak Research and Development Agency provided under Contract Nos. APVV-0097-12 and APVV-14-0073.

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Copyright information

© Springer Science+Business Media New York 2016

Authors and Affiliations

  1. 1.Institute of PhysicsFaculty of Science of P. J. Šafárik UniversityKošiceSlovak Republic
  2. 2.Institute for Condensed Matter PhysicsNASULviv-11Ukraine

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