Colossal refrigerant capacity in $[\mathrm{Fe}{(\mathrm{hyptrz})}_{3}]{\mathrm{A}}_{2}\ifmmode\cdot\else\textperiodcentered\fi{}{\mathrm{H}}_{2}\mathrm{O}$ around the freezing temperature of water

Colossal refrigerant capacity in $[Fe {(hyptrz)}_{3}] A_{2} \cdot H_{2} O$ around the freezing temperature of water

P. J. von Ranke, B. P. Alho, R. M. Ribas, E. P. Nobrega, A. Caldas, V. S. R. de Sousa, M. V. Colaço, Lippy F. Marques, Daniel L. Rocco, and P. O. Ribeiro

Phys. Rev. B 98, 224408 – Published 5 December 2018

Abstract

We report a giant barocaloric effect in the spin-crossover compound $[Fe {(hyptrz)}_{3}] A_{2} \cdot H_{2} O$ with $hyptzr = 4$ -(3′-hydroxypropyl)-1,2,4-triazole and $A = 4$ -chlorobenzenesulfonate. The origin of the giant barocaloric effect comes from the strong coupling between the lattice vibration and the electronic states $t_{2 g}^{6} (S = 0)$ and $(t_{2 g}^{4} e_{g}^{2}) (S = 2)$ of low and high spin in $F e^{+ 2} N_{6}$ cores, respectively. Our theoretical and indirect experimental results lead to the barocaloric potential $Δ S_{T} \sim 56 J k g^{- 1} K^{- 1}$ and $Δ T_{ad} \sim 10 K$ , upon pressure changes $Δ P = 0.9$ kbar, which can easily be obtained experimentally. The giant barocaloric in $[Fe {(hyptrz)}_{3}] A_{2} \cdot H_{2} O$ leads to colossal refrigerant capacity of $RC = 1223 J k g^{- 1}$ in a wide temperature span around ( $T = 273 K$ ), the freezing temperature of the water.

Received 30 August 2018
Revised 15 November 2018

DOI:https://doi.org/10.1103/PhysRevB.98.224408

Physics Subject Headings (PhySH)

Entropy Heat transfer Magnetic interactions Magnetic refrigeration Molecular magnetism

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

P. J. von Ranke^1,*, B. P. Alho¹, R. M. Ribas¹, E. P. Nobrega¹, A. Caldas¹, V. S. R. de Sousa¹, M. V. Colaço¹, Lippy F. Marques², Daniel L. Rocco³, and P. O. Ribeiro⁴

¹Instituto de Física Armando Dias Tavares, Universidade do Estado do Rio de Janeiro UERJ, Rua São Francisco Xavier, 524, 20550-013 Rio de Janeiro, RJ, Brazil
²Grupo de Materiais Inorgânicos Multifuncionais (GMIM), Instituto de Química, Universidade do Estado do Rio de Janeiro UERJ, Rua São Francisco Xavier, 524, 20550-013 Rio de Janeiro, RJ, Brazil
³Instituto de Física, Universidade Federal Fluminense, Av. Gal. Milton Tavares de Souza s/n, 24210–346 Niterói, RJ, Brazil
⁴Instituto de Aplicação Fernando Rodrigues da Silveira, Universidade do Estado do Rio de Janeiro – UERJ, Rua Santa Alexandrina 288, 20261-232 RJ, Brazil

^*Author to whom correspondence should be addressed: von.ranke@uol.com.br; Present address: Universidade do Estado do Rio de Janeiro Instituto de Física - Departemento de Eletrônica Quântica, Rua São Francisco Xavier, 524 - 30 Andar. Maracanã - Rio de Janeiro – 20550-013, Brazil.

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Vol. 98, Iss. 22 — 1 December 2018

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Physical Review B

covering condensed matter and materials physics

Colossal refrigerant capacity in $[Fe {(hyptrz)}_{3}] A_{2} \cdot H_{2} O$ around the freezing temperature of water

P. J. von Ranke, B. P. Alho, R. M. Ribas, E. P. Nobrega, A. Caldas, V. S. R. de Sousa, M. V. Colaço, Lippy F. Marques, Daniel L. Rocco, and P. O. Ribeiro

Phys. Rev. B 98, 224408 – Published 5 December 2018

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Physical Review B

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Colossal refrigerant capacity in [Fe(hyptrz)3]A2·H2O around the freezing temperature of water

P. J. von Ranke, B. P. Alho, R. M. Ribas, E. P. Nobrega, A. Caldas, V. S. R. de Sousa, M. V. Colaço, Lippy F. Marques, Daniel L. Rocco, and P. O. Ribeiro

Phys. Rev. B 98, 224408 – Published 5 December 2018

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Colossal refrigerant capacity in $[Fe {(hyptrz)}_{3}] A_{2} \cdot H_{2} O$ around the freezing temperature of water