Large magnetic cooling power involving frustrated antiferromagnetic spin-glass state in R 2 NiSi 3 (R= Gd, Er)

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dc.contributor.authorPakhira, Sen_AU
dc.contributor.authorMazumdar, Cen_AU
dc.contributor.authorRanganathan, Ren_AU
dc.contributor.authorGiri, Sen_AU
dc.contributor.authorAvdeev, Men_AU
dc.date.accessioned2020-11-30T00:18:56Zen_AU
dc.date.available2020-11-30T00:18:56Zen_AU
dc.date.issued2016-09-14en_AU
dc.date.statistics2020-11-03en_AU
dc.description.abstractThe ternary intermetallic compounds Gd2NiSi3 and Er2NiSi3 are synthesized in chemically single phase, which are characterized using dc magnetization, ac magnetic susceptibility, heat capacity, and neutron diffraction studies. Neutron diffraction and heat capacity studies confirm that long-range magnetic ordering coexists with the frustrated glassy magnetic components for both compounds. The static and dynamical features of dc magnetization and frequency-dependent ac susceptibility data reveal that Gd2NiSi3 is a canonical spin-glass system, while Er2NiSi3 is a reentrant spin cluster-glass system. The spin freezing temperature merges with the long-range antiferromagnetic ordering temperature at 16.4 K for Gd2NiSi3. Er2NiSi3 undergoes antiferromagnetic ordering at 5.4 K, which is slightly above the spin freezing temperature at 3 K. The detailed studies of nonequilibrium dynamical behavior, viz., the memory effect and relaxation behavior using different protocols, suggest that both compounds favor the hierarchical model over the droplet model. A large magnetocaloric effect is observed for both compounds. Maximum values of isothermal entropy change (−ΔSM) and relative cooling power (RCP) are found to be 18.4 J/kg K and 525 J/kg for Gd2NiSi3 and 22.6 J/kg K and 540 J/kg for Er2NiSi3, respectively, for a change in field from 0 to 70 kOe. The values of RCP are comparable to those of the promising refrigerant materials. A correlation between large RCP and magnetic frustration is discussed for developing new magnetic refrigerant materials. ©2016 American Physical Societyen_AU
dc.identifier.articlenumber104414en_AU
dc.identifier.citationPakhira, S., Mazumdar, C., Ranganathan, R., Giri, S., & Avdeev, M. (2016). Large magnetic cooling power involving frustrated antiferromagnetic spin-glass state in R 2 NiSi 3 (R= Gd, Er). Physical Review B, 94(10), 104414. doi:10.1103/PhysRevB.94.104414en_AU
dc.identifier.issn2469-9969en_AU
dc.identifier.issue10en_AU
dc.identifier.journaltitlePhysical Review Ben_AU
dc.identifier.urihttps://doi.org/10.1103/PhysRevB.94.104414en_AU
dc.identifier.urihttps://apo.ansto.gov.au/dspace/handle/10238/10031en_AU
dc.identifier.volume94en_AU
dc.language.isoenen_AU
dc.publisherAmerican Physical Societyen_AU
dc.subjectMagnetismen_AU
dc.subjectNeutron diffractionen_AU
dc.subjectSpecific heaten_AU
dc.subjectSpin glass stateen_AU
dc.subjectAntiferromagnetismen_AU
dc.subjectRefrigerantsen_AU
dc.titleLarge magnetic cooling power involving frustrated antiferromagnetic spin-glass state in R 2 NiSi 3 (R= Gd, Er)en_AU
dc.typeJournal Articleen_AU
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