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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摘要

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.

原文	English
頁（從 - 到）	773-774
頁數	2
期刊	Physica C: Superconductivity and its applications
卷	341-348
發行號	PART 3
DOIs	https://doi.org/10.1016/S0921-4534(00)00686-9
出版狀態	Published - 2000

All Science Journal Classification (ASJC) codes

電子、光磁材料
凝聚態物理學
能源工程與電力技術
電氣與電子工程

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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",

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pages = "773--774",

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

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