Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-12-15
PNAS 108, 6862 (2011)
Physics
Condensed Matter
Strongly Correlated Electrons
21 pages, 4 figures
Scientific paper
The presence of a quantum critical point (QCP) can significantly affect the thermodynamic properties of a material at finite temperatures T. This is reflected, e.g., in the entropy landscape S(T, r) in the vicinity of a QCP, yielding particularly strong variations for varying the tuning parameter r such as pressure or magnetic field B. Here we report on the determination of the critical enhancement of $ \delta S / \delta B$ near a B-induced QCP via absolute measurements of the magnetocaloric effect (MCE), $(\delta T / \delta B)_S$, and demonstrate that the accumulation of entropy around the QCP can be used for efficient low-temperature magnetic cooling. Our proof of principle is based on measurements and theoretical calculations of the MCE and the cooling performance for a Cu$^{2+}$-containing coordination polymer, which is a very good realization of a spin-1/2 antiferromagnetic Heisenberg chain - one of the simplest quantum-critical systems.
Assmus Wolf
Donath G.
Hofmann Georg
Honecker Andreas
Jaiswal-Nagar Deepshikha
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