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Thermodynamics of the Spin-1/2 Two-Leg Ladder Compound (C\(_5\)H\(_{12}\)N)\(_2\)CuBr\(_4\)

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Abstract

The thermodynamic behavior of the spin \(S=1/2\) antiferromagnetic two-leg ladder compound (C\(_5\)H\(_{12}\)N)\(_{2}\)CuBr\(_{4}\) in a uniform magnetic field is studied using numerical and analytical approaches. The entropy \(S(H,T)\) and specific heat \(C(H,T)\) are calculated. The specific heat shows various behaviors in different regions of the magnetic field. The field dependence of the specific heat is almost symmetric about the average of quantum critical fields in complete agreement with experimental results. In addition, it is found that during an adiabatic demagnetization process, temperature drops in the vicinity of the field induced zero-temperature quantum phase transitions.

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Acknowledgments

It is our pleasure to thank T. Vekua and J. Vahedi for very useful comments and interesting discussions.

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Authors and Affiliations

  1. Department of Physics, University of Guilan, 41335-1914, Rasht, Iran

    Fatemeh Amiri, Saeed Mahdavifar & Hanif Hadipour

  2. Department of Physics, Payam Noor University, 19395-3697, Tehran, Iran

    Mahboobeh Shahri Naseri

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  1. Fatemeh Amiri
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  2. Saeed Mahdavifar
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  3. Hanif Hadipour
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Correspondence to Fatemeh Amiri.

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Amiri, F., Mahdavifar, S., Hadipour, H. et al. Thermodynamics of the Spin-1/2 Two-Leg Ladder Compound (C\(_5\)H\(_{12}\)N)\(_2\)CuBr\(_4\) . J Low Temp Phys 177, 203–216 (2014). https://doi.org/10.1007/s10909-014-1212-7

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