Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/30119
Title: Magnetocaloric effect as a signature of quantum level-crossing for a spin-gapped system
Authors: CHAKRABORTY, Tanmoy 
Mitra, Chiranjib
Issue Date: 2019
Publisher: IOP PUBLISHING LTD
Source: JOURNAL OF PHYSICS-CONDENSED MATTER, 31(47) (Art N° 475802)
Abstract: Recent research dealing with magnetocaloric effect (MCE) study of antiferromagnetic (AFM) low dimensional spin systems have revealed a number of fascinating ground-state crossover characteristics upon application of external magnetic field. Herein, through MCI' investigation we have explored field-induced quantum level-crossing characteristics of one such spin system: NH4CuPO4 center dot H2O (NCP), an AFM spin 1/2 dimer. Experimental magnetization and specific heat data are presented and the data have been employed to evaluate entropy, magnetic energy and magnetocaloric properties. We witness a sign change in magnetic Grtineisen parameter across the level-crossing field B-C. An adiabatic cooling is observed at low temperature by tracing the isentropic curves in temperature-magnetic field plane. Energy-level crossover characteristics in NCP interpreted through MCE analysis are well consistent with the observations made from magnetization and specific heat data.
Notes: [Chakraborty, Tanmoy; Mitra, Chiranjib] Indian Inst Sci Educ & Res, Nadia 741246, W Bengal, India. [Chakraborty, Tanmoy] Hasselt Univ, Inst Mat Res IMO, Wetenschapspk 1, B-3590 Diepenbeek, Belgium.
Keywords: quantum level-crossing;magnetocaloric effect (MCE);magnetization;specific heat
Document URI: http://hdl.handle.net/1942/30119
ISSN: 0953-8984
e-ISSN: 1361-648X
DOI: 10.1088/1361-648X/ab3962
ISI #: 000482575600001
Rights: 2019 IOP Publishing Ltd
Category: A1
Type: Journal Contribution
Validations: ecoom 2020
Appears in Collections:Research publications

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