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Title: Element-resolved thermodynamics of magnetocaloric LaFe 13 x Si x

Journal Article · · Physical Review Letters
 [1];  [2];  [3];  [4];  [4];  [2];  [4];  [5];  [5];  [5];  [6];  [7];  [4]
  1. Univ. of Duisburg-Essen, Duisburg (Germany); IFW Dresden, Dresden (Germany)
  2. Univ. of Duisburg-Essen, Duisburg (Germany); Max Planck Institute of Microstructure Physics, Halle (Germany)
  3. Ruhr-Univ. Bochum, Bochum (Germany)
  4. Univ. of Duisburg-Essen, Duisburg (Germany)
  5. Argonne National Lab. (ANL), Argonne, IL (United States)
  6. IFW Dresden, Dresden (Germany)
  7. TU Darmstadt, Darmstadt (Germany)

By combination of two independent approaches, nuclear resonant inelastic x-ray scattering and first-principles calculations in the framework of density functional theory, we demonstrate significant changes in the element-resolved vibrational density of states across the first-order transition from the ferromagnetic low temperature to the paramagnetic high temperature phase of LaFe13-xSix. These changes originate from the itinerant electron metamagnetism associated with Fe and lead to a pronounced magneto-elastic softening despite the large volume decrease at the transition. As a result, the increase in lattice entropy associated with the Fe subsystem is significant and contributes cooperatively with the magnetic and electronic entropy changes to the excellent magneto- and barocaloric properties.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
Argonne National Laboratory - Advanced Photon Source; USDOE
Grant/Contract Number:
AC02-06CH11357
OSTI ID:
1362293
Alternate ID(s):
OSTI ID: 1180313
Journal Information:
Physical Review Letters, Vol. 114, Issue 5; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 71 works
Citation information provided by
Web of Science

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Hysteresis Design of Magnetocaloric Materials-From Basic Mechanisms to Applications journal August 2018
Hysteresis and Phase Transition Kinetics in Magnetocaloric Materials journal October 2017
Moment-Volume Coupling in La(Fe 1 −x Si x ) 13 journal December 2017
Overview of magnetoelastic coupling in (Mn, Fe)2(P, Si)-type magnetocaloric materials journal July 2018
Temperature-dependent phonon spectra of magnetic random solid solutions journal February 2018
Two different critical regimes enclosed in the Bean–Rodbell model and their implications for the field dependence and universal scaling of the magnetocaloric effect journal January 2017
Influence of the Ge distribution on the first order magnetic transition of the MnFe(P,Ge) magnetocaloric material journal January 2018
Relation between paramagnetic entropy and disordered local moment in La(Fe 0.88 Si 0.12 ) 13 magnetocaloric compound journal June 2016
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Advanced materials for magnetic cooling: Fundamentals and practical aspects journal June 2017
Local electronic and magnetic properties of pure and Mn-containing magnetocaloric LaFe 13− x Si x compounds inferred from Mössbauer spectroscopy and magnetometry journal July 2015
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