| Pressure-induced colossal piezoresistance effect and the collapse of the polaronic state in the bilayer manganite (La(0.4)Pr(0.6))(1.2)Sr(1.8)Mn(2)O(7). | |
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MedLine Citation:
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PMID: 22392884 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We have investigated the effect of hydrostatic pressure as a function of temperature on the resistivity of a single crystal of the bilayer manganite (La(0.4)Pr(0.6))(1.2)Sr(1.8)Mn(2)O(7). Whereas a strong insulating behaviour is observed at all temperatures at ambient pressure, a clear transition into a metallic-like behaviour is induced when the sample is subjected to a pressure (P) of ∼1.0 GPa at T < 70 K. A huge negative piezoresistance ∼10(6) in the low temperature region at moderate pressures is observed. When the pressure is increased further (5.5 GPa), the high temperature polaronic state disappears and a metallic behaviour is observed. The insulator to metal transition temperature exponentially increases with pressure and the distinct peak in the resistivity that is observed at 1.0 GPa almost vanishes for P > 7.0 GPa. A modification in the orbital occupation of the e(g) electron between 3d(x(2)-y(2)) and 3d(z(2)-r(2)) states, as proposed earlier, leading to a ferromagnetic double-exchange phenomenon, can qualitatively account for our data. |
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Authors:
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R Thiyagarajan; N Manivannan; S Arumugam; S Esakki Muthu; N R Tamilselvan; C Sekar; H Yoshino; K Murata; M O Apostu; R Suryanarayanan; A Revcolevschi |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-3-05 |
Journal Detail:
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Title: Journal of physics. Condensed matter : an Institute of Physics journal Volume: 24 ISSN: 1361-648X ISO Abbreviation: - Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-3-6 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101165248 Medline TA: J Phys Condens Matter Country: - |
Other Details:
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Languages: ENG Pagination: 136002 Citation Subset: - |
Affiliation:
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Centre for High Pressure Research, School of Physics, Bharathidasan University, Tiruchirappalli 620024, India. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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