Role of external and internal perturbations on ferromagnetic phase transitions in manganites: existence of tricritical points

Research output: Contribution to journalArticle

View graph of relations Save citation

Authors

Research units

Abstract

A phenomenological mean-field theory is presented to describe the role of external magnetic field, pressure and chemical substitution on the nature of ferromagnetic (FM) to paramagnetic (PM) phase transition in manganites. The application of external field (or pressure) shifts the transition, leading to a field (or pressure) dependent phase boundary along which a tricritical point is shown to exist where a first-order FM-PM transition becomes second-order. We show that the effect of chemical substitution on the FM transition is analogous to that of external perturbations (magnetic field and pressure); this includes the existence of a tricritical point at which the order of transition changes. Our theoretical predictions satisfactorily explain the nature of FM-PM transition, observed in several systems. The modeling hypothesis has been critically verified from our experimental data from a wide range of colossal magnetoresistive manganite single crystals like Sm0.52Sr0.48MnO3. The theoretical model prediction of a tricritical point has been validated in this experiment which provides a major ramification of the strength of the model proposed.

Request a copy

Request a copy

Documents

  • Role of external and internal perturbations on ferromagnetic phase transitions

    Rights statement: This is an author-created, un-copyedited version of an article accepted for publication/published in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-648X/aacb3a

    Accepted author manuscript, 819 KB, PDF-document

    Embargo ends: 8/06/19

    Licence: CC BY-NC-ND Show licence

Details

Original languageEnglish
Article number295101
JournalJournal of Physics: Condensed Matter
Volume30
Issue number29
Early online date8 Jun 2018
DOIs
StatePublished - 25 Jul 2018

Bibliographic note

This is an author-created, un-copyedited version of an article accepted for publication/published in [insert name of journal]. IOP Publishing Ltd is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at https://doi.org/10.1088/1361-648X/aacb3a

Employable Graduates; Exploitable Research

Copy the text from this field...