High pressure study on maganites - The double exchange and polaron effects

Y. S. Wang; A. K. Heilman; B. Lorenz; Y. Y. Xue; C. W. Chu; J. P. Franck; W. M. Chen

doi:10.1016/S0921-4534(00)00686-9

High pressure study on maganites - The double exchange and polaron effects

Y. S. Wang, A. K. Heilman, B. Lorenz, Y. Y. Xue, C. W. Chu, J. P. Franck, W. M. Chen

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Abstract

We have examined the influence of oxygen-isotope on the pressure effects on the metal-insulator (M-I) transition in La_0.65Ca_0.35MnO₃ (A) and on both the M-I and charge ordering (CO) transitions in La_0.57Ca_0.43MnO₃ (B) under hydrostatic pressures. The pressure was found to enhance T_c at different rates, depending on the O-isotopic mass of the sample. The greater dlnTc/dP observed in the O-18 sample could be understood qualitatively in terms of the double exchange and the band reduction effect of polarons. In the B-samples, the situation is much more complex. Pressure enhances Tc linearly at rates independent of the O-isotopic mass but varies Tco nonlinearly in a complex way. The thermal hysteresis of the CO transition diminishes with increase in pressure suggesting the suppression of the first order CO transition under pressure in both isotopes.

Original language	English
Pages (from-to)	773-774
Number of pages	2
Journal	Physica C: Superconductivity and its applications
Volume	341-348
Issue number	PART 3
DOIs	https://doi.org/10.1016/S0921-4534(00)00686-9
Publication status	Published - 2000

All Science Journal Classification (ASJC) codes

Electronic, Optical and Magnetic Materials
Condensed Matter Physics
Energy Engineering and Power Technology
Electrical and Electronic Engineering

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title = "High pressure study on maganites - The double exchange and polaron effects",

abstract = "We have examined the influence of oxygen-isotope on the pressure effects on the metal-insulator (M-I) transition in La0.65Ca0.35MnO3 (A) and on both the M-I and charge ordering (CO) transitions in La0.57Ca0.43MnO3 (B) under hydrostatic pressures. The pressure was found to enhance Tc at different rates, depending on the O-isotopic mass of the sample. The greater dlnTc/dP observed in the O-18 sample could be understood qualitatively in terms of the double exchange and the band reduction effect of polarons. In the B-samples, the situation is much more complex. Pressure enhances Tc linearly at rates independent of the O-isotopic mass but varies Tco nonlinearly in a complex way. The thermal hysteresis of the CO transition diminishes with increase in pressure suggesting the suppression of the first order CO transition under pressure in both isotopes.",

author = "Wang, {Y. S.} and Heilman, {A. K.} and B. Lorenz and Xue, {Y. Y.} and Chu, {C. W.} and Franck, {J. P.} and Chen, {W. M.}",

note = "Funding Information: This work is supported in part by NSF Grant No.DMR-9804325, MRSEC/NSF Grant No. DMR-9632667, the T.L.L. Temple Foundation, the John and Rebecca Moores Endowment and the State of Texas through TCSUH. The work in Alberta is supported in part by the National Science and Engineering Research Council of Canada.",

year = "2000",

doi = "10.1016/S0921-4534(00)00686-9",

language = "English",

volume = "341-348",

pages = "773--774",

journal = "Physica C: Superconductivity and its applications",

issn = "0921-4534",

publisher = "Elsevier",

number = "PART 3",

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TY - JOUR

T1 - High pressure study on maganites - The double exchange and polaron effects

AU - Wang, Y. S.

AU - Heilman, A. K.

AU - Lorenz, B.

AU - Xue, Y. Y.

AU - Chu, C. W.

AU - Franck, J. P.

AU - Chen, W. M.

N1 - Funding Information: This work is supported in part by NSF Grant No.DMR-9804325, MRSEC/NSF Grant No. DMR-9632667, the T.L.L. Temple Foundation, the John and Rebecca Moores Endowment and the State of Texas through TCSUH. The work in Alberta is supported in part by the National Science and Engineering Research Council of Canada.

PY - 2000

Y1 - 2000

N2 - We have examined the influence of oxygen-isotope on the pressure effects on the metal-insulator (M-I) transition in La0.65Ca0.35MnO3 (A) and on both the M-I and charge ordering (CO) transitions in La0.57Ca0.43MnO3 (B) under hydrostatic pressures. The pressure was found to enhance Tc at different rates, depending on the O-isotopic mass of the sample. The greater dlnTc/dP observed in the O-18 sample could be understood qualitatively in terms of the double exchange and the band reduction effect of polarons. In the B-samples, the situation is much more complex. Pressure enhances Tc linearly at rates independent of the O-isotopic mass but varies Tco nonlinearly in a complex way. The thermal hysteresis of the CO transition diminishes with increase in pressure suggesting the suppression of the first order CO transition under pressure in both isotopes.

AB - We have examined the influence of oxygen-isotope on the pressure effects on the metal-insulator (M-I) transition in La0.65Ca0.35MnO3 (A) and on both the M-I and charge ordering (CO) transitions in La0.57Ca0.43MnO3 (B) under hydrostatic pressures. The pressure was found to enhance Tc at different rates, depending on the O-isotopic mass of the sample. The greater dlnTc/dP observed in the O-18 sample could be understood qualitatively in terms of the double exchange and the band reduction effect of polarons. In the B-samples, the situation is much more complex. Pressure enhances Tc linearly at rates independent of the O-isotopic mass but varies Tco nonlinearly in a complex way. The thermal hysteresis of the CO transition diminishes with increase in pressure suggesting the suppression of the first order CO transition under pressure in both isotopes.

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JO - Physica C: Superconductivity and its applications

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ER -

High pressure study on maganites - The double exchange and polaron effects

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