Crossover from large to small polarons across the metal-insulator transition in manganites

Research output: Contribution to journalArticle

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Abstract

We report Mn K-edge extended x-ray absorption fine structure spectra on La0.75Ca0.25MnO3 up to high momentum transfer across the metal-insulator (M-I) transition. The data show compelling evidence for (i) large or intermediate Jahn-Teller polarons (IJTP), characterized by an anomalous longer Mn-O bond (Δ R = 0.09 Å) in the metallic phase (T < 170K), and (ii) appearance of small JT polarons (SJTP) at T> 170K, characterized by a longer Mn-O bond (Δ R = 0.21 Å), which coexist with the IJTP above the M-I transition and has equal probability in the temperature range of colossal magnetoresistance.

Original languageEnglish (US)
Pages (from-to)878-881
Number of pages4
JournalPhysical review letters
Volume81
Issue number4
DOIs
StatePublished - Jan 1 1998

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polarons
crossovers
insulators
x ray absorption
metals
momentum transfer
fine structure
temperature

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

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title = "Crossover from large to small polarons across the metal-insulator transition in manganites",
abstract = "We report Mn K-edge extended x-ray absorption fine structure spectra on La0.75Ca0.25MnO3 up to high momentum transfer across the metal-insulator (M-I) transition. The data show compelling evidence for (i) large or intermediate Jahn-Teller polarons (IJTP), characterized by an anomalous longer Mn-O bond (Δ R = 0.09 {\AA}) in the metallic phase (T < 170K), and (ii) appearance of small JT polarons (SJTP) at T> 170K, characterized by a longer Mn-O bond (Δ R = 0.21 {\AA}), which coexist with the IJTP above the M-I transition and has equal probability in the temperature range of colossal magnetoresistance.",
author = "Sang-Wook Cheong",
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doi = "https://doi.org/10.1103/PhysRevLett.81.878",
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pages = "878--881",
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Crossover from large to small polarons across the metal-insulator transition in manganites. / Cheong, Sang-Wook.

In: Physical review letters, Vol. 81, No. 4, 01.01.1998, p. 878-881.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Crossover from large to small polarons across the metal-insulator transition in manganites

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AB - We report Mn K-edge extended x-ray absorption fine structure spectra on La0.75Ca0.25MnO3 up to high momentum transfer across the metal-insulator (M-I) transition. The data show compelling evidence for (i) large or intermediate Jahn-Teller polarons (IJTP), characterized by an anomalous longer Mn-O bond (Δ R = 0.09 Å) in the metallic phase (T < 170K), and (ii) appearance of small JT polarons (SJTP) at T> 170K, characterized by a longer Mn-O bond (Δ R = 0.21 Å), which coexist with the IJTP above the M-I transition and has equal probability in the temperature range of colossal magnetoresistance.

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