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001039787 1001_ $$0P:(DE-Juel1)180764$$aBiniskos, Nikolaos$$b0$$eCorresponding author
001039787 245__ $$aParamagnetic fluctuations of the magnetocaloric compound MnFe 4 Si 3
001039787 260__ $$aWoodbury, NY$$bInst.$$c2025
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001039787 520__ $$aAn inelastic neutron scattering technique is employed to investigate the paramagnetic spin dynamics in a single-crystalline sample of the magnetocaloric compound MnFe4Si3. In the investigated temperature range, 1.033 x TC to 1.5 x TC , where TC is the Curie temperature, the spin fluctuations are well described by the ferromagnetic Heisenberg model predictions. Apart from the Heisenberg exchange, additional pseudodipolar interactions manifest through a finite long-wavelength relaxation rate that vanishes at the transition temperature (TC = 305 K). Based on the characteristic extent of spin fluctuations in wave-vector and energy space, we determine that the nature of magnetism in MnFe4Si3 is localized above room temperature. This contrasts with the most celebrated Mn- and Fe-based magnetocaloric materials that are considered as itinerant magnets. The field dependence of the paramagnetic spectra shows a strong suppression of the quasielastic excitations, while a field-induced spin-wave mode appears at finite-energy transfers for a magnetic field of 2 T. This modification of the spectra suggests a decrease of magnetic entropy with applied magnetic field that finds echo in the magnetocaloric properties of the system.
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001039787 65017 $$0V:(DE-MLZ)GC-1604-2016$$2V:(DE-HGF)$$aMagnetic Materials$$x0
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001039787 7001_ $$0P:(DE-Juel1)130943$$aSchmalzl, K.$$b1
001039787 7001_ $$0P:(DE-Juel1)130884$$aPersson, J.$$b2$$ufzj
001039787 7001_ $$00000-0002-5421-5061$$aRaymond, S.$$b3
001039787 773__ $$0PERI:(DE-600)2844160-6$$a10.1103/PhysRevB.111.054424$$gVol. 111, no. 5, p. 054424$$n5$$p054424$$tPhysical review / B$$v111$$x2469-9950$$y2025
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