Skip to content Skip to navigation
University of Warwick
  • Study
  • |
  • Research
  • |
  • Business
  • |
  • Alumni
  • |
  • News
  • |
  • About

University of Warwick
Publications service & WRAP

Highlight your research

  • WRAP
    • Home
    • Search WRAP
    • Browse by Warwick Author
    • Browse WRAP by Year
    • Browse WRAP by Subject
    • Browse WRAP by Department
    • Browse WRAP by Funder
    • Browse Theses by Department
  • Publications Service
    • Home
    • Search Publications Service
    • Browse by Warwick Author
    • Browse Publications service by Year
    • Browse Publications service by Subject
    • Browse Publications service by Department
    • Browse Publications service by Funder
  • Help & Advice
University of Warwick

The Library

  • Login
  • Admin

Caloric effects around phase transitions in magnetic materials described by ab initio theory : the electronic glue and fluctuating local moments

Tools
- Tools
+ Tools

Mendive-Tapia, Eduardo and Staunton, Julie B. (2020) Caloric effects around phase transitions in magnetic materials described by ab initio theory : the electronic glue and fluctuating local moments. Journal of Applied Physics, 127 (11). 113903. doi:10.1063/5.0003243 ISSN 0021-8979.

[img]
Preview
PDF
WRAP-caloric-effects-transitions-magnetic-ab-initio-glue-fluctuating-moments-Staunton-2020.pdf - Accepted Version - Requires a PDF viewer.

Download (2487Kb) | Preview
Official URL: http://dx.doi.org/10.1063/5.0003243

Request Changes to record.

Abstract

We describe magneto-, baro-, and elastocaloric effects (MCEs, BCEs, and eCEs) in materials, which possess both discontinuous (first-order) and continuous (second-order) magnetic phase transitions. Our ab initio theory of the interacting electrons of materials in terms of disordered local moments has produced explicit mechanisms for the drivers of these transitions, and here, we study associated caloric effects in three case studies where both types of transition are evident. Our earlier work had described FeRh’s magnetic phase diagram and large MCE. Here, we present calculations of its substantial BCE and eCE. We describe the MCE of dysprosium and find very good agreement with experimental values for isothermal entropy ((ΔSiso) and adiabatic temperature (ΔTad) changes over a large temperature span and different applied magnetic field values. We examine the conditions for optimal values of both ΔSiso and ΔTad that comply with a Clausius–Clapeyron analysis, which we use to propose a promising elastocaloric cooling cycle arising from the unusual dependence of the entropy on temperature and biaxial strain found in our third case study—the Mn3GaN antiperovskite. We explain how both ΔSiso and ΔTad can be kept large by exploiting the complex tensile strain–temperature magnetic phase diagram, which we had earlier predicted for this material and also propose that hysteresis effects will be absent from half of the caloric cycle. This rich and complex behavior stems from the frustrated nature of the interactions among the Mn local moments.

Item Type: Journal Article
Subjects: Q Science > QC Physics
Divisions: Faculty of Science, Engineering and Medicine > Science > Physics
Library of Congress Subject Headings (LCSH): Magnetic materials , Cooling curves
Journal or Publication Title: Journal of Applied Physics
Publisher: American Institute of Physics
ISSN: 0021-8979
Official Date: 18 March 2020
Dates:
DateEvent
18 March 2020Published
5 March 2020Accepted
Volume: 127
Number: 11
Article Number: 113903
DOI: 10.1063/5.0003243
Status: Peer Reviewed
Publication Status: Published
Reuse Statement (publisher, data, author rights): “This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in J. Appl. Phys. 127, 113903 (2020); https://doi.org/10.1063/5.0003243 and may be found at http://dx.doi.org/10.1063/5.0003243
Access rights to Published version: Restricted or Subscription Access
Date of first compliant deposit: 19 March 2020
Date of first compliant Open Access: 23 March 2020
RIOXX Funder/Project Grant:
Project/Grant IDRIOXX Funder NameFunder ID
EP/J06750/1 [EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
EP/M028941/1[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266
HI1300/6-2[EPSRC] Engineering and Physical Sciences Research Councilhttp://dx.doi.org/10.13039/501100000266

Request changes or add full text files to a record

Repository staff actions (login required)

View Item View Item

Downloads

Downloads per month over past year

View more statistics

twitter

Email us: wrap@warwick.ac.uk
Contact Details
About Us