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- W2061781451 abstract "In this paper we report point-contact spectroscopy (PCS) measurements on single crystals of metallic ${mathrm{La}}_{0.75}{mathrm{Sr}}_{0.25}{mathrm{MnO}}_{3}.$ The electron-phonon coupling function as obtained from the PCS shows large peaks for phonon frequencies $20 mathrm{meV}<~ensuremath{omega}<~100 mathrm{meV}.$ This leads to a rather large electron-phonon coupling constant $ensuremath{lambda}ensuremath{simeq}1.2.$ We have shown that a sizable fraction of the total resistivity in the temperature range $T<~{0.4T}_{c}$ can be of phononic origin and can be explained using the experimentally observed electron-phonon coupling function. As $stackrel{ensuremath{rightarrow}}{T}{T}_{c},$ extra contribution to resistivity arising from spins dominate. We find that the magnetoresistance vanishes in the temperature range $T<~{0.4T}_{c},$ where the predominant contribution to $ensuremath{rho}$ arises from phonons. We have also performed PCS in 6 T magnetic field. The resistivity calculated from the spectrum at 6 T does not differ appreciably from that calculated at 0 T. Our experiment has been validated by a similar experiment on a nonmagnetic perovskite oxide system, ${mathrm{Na}}_{0.9}{mathrm{WO}}_{3}.$" @default.
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- W2061781451 date "2002-04-04" @default.
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- W2061781451 title "Point-contact spectroscopy of single crystal<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>La</mml:mi></mml:mrow><mml:mrow><mml:mn>0.75</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>0.25</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant=normal>MnO</mml:mi></mml:mrow><mml:mrow…" @default.
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- W2061781451 doi "https://doi.org/10.1103/physrevb.65.140406" @default.
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