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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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