Emission Mössbauer study of CMR manganite La0.8Ca0.2MnO3 . II. Step by step snapshots of the metal-insulator transition

Vladimir Chechersky, Kiyoshi Nomura, Amar Nath, Honglyoul Ju, Richard L. Greene

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

We follow the step by step progression of events while approaching Curie temperature TC from below using 57Co substituent as microprobe in an emission Mössbauer study combined with resistivity measurements. In the temperature range 0.33 < T/TC ≤ 1, the material consists of a mixture of ferromagnetic and paramagnetic regions within the same matrix. An increase of the amount of paramagnetic fraction is accompanied by a decrease in electron delocalization in the ferromagnetic regions. At T ≥ TC , the electrons are localized to neighboring Mn4+/Mn3+ pairs only, in about 46% of the paramagnetic species. The strength with which Mn atoms are bound to the neighbors also decreases progressively and rather steeply in the range 0.65 ≤ T/TC = 1. Zero field resistivity, ρ0, follows linearly with the amount of paramagnetic phase in the range 0.65 ≤ T/TC ≤ 1 and still show metal-like behavior up to T/TC ≈ 1.03.

Original languageEnglish
Pages (from-to)732-737
Number of pages6
JournalFizika Nizkikh Temperatur (Kharkov)
Volume23
Issue number7
Publication statusPublished - 1997 Dec 1

Fingerprint

insulators
electrical resistivity
progressions
metals
Curie temperature
electrons
matrices
atoms
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Chechersky, Vladimir ; Nomura, Kiyoshi ; Nath, Amar ; Ju, Honglyoul ; Greene, Richard L. / Emission Mössbauer study of CMR manganite La0.8Ca0.2MnO3 . II. Step by step snapshots of the metal-insulator transition. In: Fizika Nizkikh Temperatur (Kharkov). 1997 ; Vol. 23, No. 7. pp. 732-737.
@article{391f9905c554442db84b8307b3cda862,
title = "Emission M{\"o}ssbauer study of CMR manganite La0.8Ca0.2MnO3 . II. Step by step snapshots of the metal-insulator transition",
abstract = "We follow the step by step progression of events while approaching Curie temperature TC from below using 57Co substituent as microprobe in an emission M{\"o}ssbauer study combined with resistivity measurements. In the temperature range 0.33 < T/TC ≤ 1, the material consists of a mixture of ferromagnetic and paramagnetic regions within the same matrix. An increase of the amount of paramagnetic fraction is accompanied by a decrease in electron delocalization in the ferromagnetic regions. At T ≥ TC , the electrons are localized to neighboring Mn4+/Mn3+ pairs only, in about 46{\%} of the paramagnetic species. The strength with which Mn atoms are bound to the neighbors also decreases progressively and rather steeply in the range 0.65 ≤ T/TC = 1. Zero field resistivity, ρ0, follows linearly with the amount of paramagnetic phase in the range 0.65 ≤ T/TC ≤ 1 and still show metal-like behavior up to T/TC ≈ 1.03.",
author = "Vladimir Chechersky and Kiyoshi Nomura and Amar Nath and Honglyoul Ju and Greene, {Richard L.}",
year = "1997",
month = "12",
day = "1",
language = "English",
volume = "23",
pages = "732--737",
journal = "Fizika Nizkikh Temperatur",
issn = "0132-6414",
publisher = "American Institute of Physics Publising LLC",
number = "7",

}

Emission Mössbauer study of CMR manganite La0.8Ca0.2MnO3 . II. Step by step snapshots of the metal-insulator transition. / Chechersky, Vladimir; Nomura, Kiyoshi; Nath, Amar; Ju, Honglyoul; Greene, Richard L.

In: Fizika Nizkikh Temperatur (Kharkov), Vol. 23, No. 7, 01.12.1997, p. 732-737.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Emission Mössbauer study of CMR manganite La0.8Ca0.2MnO3 . II. Step by step snapshots of the metal-insulator transition

AU - Chechersky, Vladimir

AU - Nomura, Kiyoshi

AU - Nath, Amar

AU - Ju, Honglyoul

AU - Greene, Richard L.

PY - 1997/12/1

Y1 - 1997/12/1

N2 - We follow the step by step progression of events while approaching Curie temperature TC from below using 57Co substituent as microprobe in an emission Mössbauer study combined with resistivity measurements. In the temperature range 0.33 < T/TC ≤ 1, the material consists of a mixture of ferromagnetic and paramagnetic regions within the same matrix. An increase of the amount of paramagnetic fraction is accompanied by a decrease in electron delocalization in the ferromagnetic regions. At T ≥ TC , the electrons are localized to neighboring Mn4+/Mn3+ pairs only, in about 46% of the paramagnetic species. The strength with which Mn atoms are bound to the neighbors also decreases progressively and rather steeply in the range 0.65 ≤ T/TC = 1. Zero field resistivity, ρ0, follows linearly with the amount of paramagnetic phase in the range 0.65 ≤ T/TC ≤ 1 and still show metal-like behavior up to T/TC ≈ 1.03.

AB - We follow the step by step progression of events while approaching Curie temperature TC from below using 57Co substituent as microprobe in an emission Mössbauer study combined with resistivity measurements. In the temperature range 0.33 < T/TC ≤ 1, the material consists of a mixture of ferromagnetic and paramagnetic regions within the same matrix. An increase of the amount of paramagnetic fraction is accompanied by a decrease in electron delocalization in the ferromagnetic regions. At T ≥ TC , the electrons are localized to neighboring Mn4+/Mn3+ pairs only, in about 46% of the paramagnetic species. The strength with which Mn atoms are bound to the neighbors also decreases progressively and rather steeply in the range 0.65 ≤ T/TC = 1. Zero field resistivity, ρ0, follows linearly with the amount of paramagnetic phase in the range 0.65 ≤ T/TC ≤ 1 and still show metal-like behavior up to T/TC ≈ 1.03.

UR - http://www.scopus.com/inward/record.url?scp=0010001069&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0010001069&partnerID=8YFLogxK

M3 - Article

AN - SCOPUS:0010001069

VL - 23

SP - 732

EP - 737

JO - Fizika Nizkikh Temperatur

JF - Fizika Nizkikh Temperatur

SN - 0132-6414

IS - 7

ER -