Investigation of thermodynamic properties of Cu(NH3)4SO4•H2O, a Heisenberg spin chain compound

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS

卷:439

Article

Chakraborty, Tanmoy^1,2  Singh, Harkirat^1,3  Chaudhuri, Dipanjan^1,4  Jeevan, Hirale S.⁵  Gegenwart, Philipp^5,6  Mitra, Chiranjib¹ 

[1] Indian Inst Sci Educ & Res IISER Kolkata, Mohanpur Campus,PO BCKV Campus Main Off, Nadia 741252, W Bengal, India

[2] Tech Univ Dortmund, Fak Phys, D-44221 Dortmund, Germany

[3] Tata Inst Fundamental Res, Homi Bhabha Rd, Bombay 400005, Maharashtra, India

[4] Johns Hopkins Univ, Dept Phys & Astron, Inst Quantum Matter, Baltimore, MD 21218 USA

[5] Georg August Univ, I Phys Inst, D-37073 Gottingen, Germany

[6] Univ Augsburg, Ctr Elect Correlat & Magnetism, Expt Phys 6, D-86159 Augsburg, Germany

关键词: Spin 1/2 chain;    Magnetization;    Specific heat;   

DOI  :  10.1016/j.jmmm.2017.05.020

来源: Elsevier

【 摘 要 】

Detailed experimental investigation of thermal and magnetic properties are presented for Cu(NH3)(4)SO4 center dot H2O, an ideal uniform Heisenberg spin 1/2 chain compound. A comparison of these properties with relevant spin models is also presented. Temperature dependent magnetic susceptibility and specific heat data have been compared with the exact solution for uniform Heisenberg chain model derived by means of Bethe ansatz technique. Magnetization isotherms measured as a function of field are analyzed using the numerical results simulated by Quantum Monte Carlo technique. Specific heat as a function of magnetic field (up to 7T) and temperature (down to 2 K) is reported. Subsequently, the data are compared with the corresponding theoretical curves for infinite Heisenberg spin 1/2 chain model with J = 6 K. Moreover, internal energy and entropy are calculated by analyzing the experimental specific heat data. Magnetic field and temperature dependent behavior of entropy and internal energy are in good agreement with the theoretical predictions. (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

Free