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

Prabir K. Mukherjee, Prosenjit Sarkar, Amit K Chattopadhyay

Research output: Contribution to journalArticle

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.

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

Fingerprint

Manganites
Phase transitions
perturbation
Substitution reactions
Magnetic fields
Mean field theory
Phase boundaries
substitutes
Single crystals
predictions
magnetic fields
Experiments
shift
single crystals

Bibliographical 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

Cite this

@article{8e57d6b699624790a6214c6dd7ddfa85,
title = "Role of external and internal perturbations on ferromagnetic phase transitions in manganites: existence of tricritical points",
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.",
author = "Mukherjee, {Prabir K.} and Prosenjit Sarkar and Chattopadhyay, {Amit K}",
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",
year = "2018",
month = "7",
day = "25",
doi = "10.1088/1361-648X/aacb3a",
language = "English",
volume = "30",
journal = "Journal of Physics: Condensed Matter",
issn = "0953-8984",
publisher = "IOP Publishing Ltd.",
number = "29",

}

Role of external and internal perturbations on ferromagnetic phase transitions in manganites : existence of tricritical points. / Mukherjee, Prabir K.; Sarkar, Prosenjit; Chattopadhyay, Amit K.

In: Journal of Physics: Condensed Matter, Vol. 30, No. 29, 295101, 25.07.2018.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Role of external and internal perturbations on ferromagnetic phase transitions in manganites

T2 - existence of tricritical points

AU - Mukherjee, Prabir K.

AU - Sarkar, Prosenjit

AU - Chattopadhyay, Amit K

N1 - 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

PY - 2018/7/25

Y1 - 2018/7/25

N2 - 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.

AB - 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.

U2 - 10.1088/1361-648X/aacb3a

DO - 10.1088/1361-648X/aacb3a

M3 - Article

C2 - 29882515

VL - 30

JO - Journal of Physics: Condensed Matter

JF - Journal of Physics: Condensed Matter

SN - 0953-8984

IS - 29

M1 - 295101

ER -