Comment on papers "Effect of Ag substitution on the transport property and magnetoresistance of LaMnO3" [J. Magn. Magn. Mater. 248 (2002) 26] and "Possible magnetic phase separation in Ru-doped La 0.67Ca0.33O3" [J. Magn. Magn. Mater. 257 (2003) 195]

E. Rozenberg; L. S. Lakshmi; V. Sridharan; D. V. Natarajan; S. Chandra; V. S. Sastry; T. S. Radhakrishnan; P. Pandian; R. J. Joseyphus; A. Narayanasamy

doi:10.1016/j.jmmm.2003.08.021

Comment on papers "Effect of Ag substitution on the transport property and magnetoresistance of LaMnO₃" [J. Magn. Magn. Mater. 248 (2002) 26] and "Possible magnetic phase separation in Ru-doped La _0.67Ca_0.33O₃" [J. Magn. Magn. Mater. 257 (2003) 195]

E. Rozenberg, L. S. Lakshmi, V. Sridharan, D. V. Natarajan, S. Chandra, V. S. Sastry, T. S. Radhakrishnan, P. Pandian, R. J. Joseyphus, A. Narayanasamy

Department of Physics

Research output: Contribution to journal › Comment/debate

7 Scopus citations

Abstract

In recent papers Ye et al. (J. Magn. Magn. Mater. 248 (2002) 26) and Lakshmi et al. (J. Magn. Magn. Mater. 257 (2003) 195) reported the characteristic features of electrical resistivity (ρ) versus temperature (T) dependences of polycrystalline-doped manganites La_1-xAg _xMnO₃ and La_0.67Ca_0.33Mn _1-xRu_xO₃. Infact, two peaks on ρ(T) curve coexist: broad one at some T_max below the Curie points (T _C) of these compounds and a sharp peak near T_C. Authors interpreted such coexistence as an evidence of electronic/magnetic phase separation in the above-noted systems below its T_C. It is shown in this comment that such an interpretation is obviously invalid for La _1-xAg_xMnO₃ system and is very questionable for La_0.67Ca_0.33Mn_1-xRu_xO₃. The simplest and natural reason for the appearance of considered features on ρ(T) dependences of polycrystalline manganites is the well-known grain-boundary effects.

Original language	English
Pages (from-to)	237-240
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	270
Issue number	1-2
DOIs	https://doi.org/10.1016/j.jmmm.2003.08.021
State	Published - 1 Mar 2004

Keywords

Electrical resistivity
Grain-boundary effects
Polycrystalline-doped manganites

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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10.1016/j.jmmm.2003.08.021

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Rozenberg, E., Lakshmi, L. S., Sridharan, V., Natarajan, D. V., Chandra, S., Sastry, V. S., Radhakrishnan, T. S., Pandian, P., Joseyphus, R. J., & Narayanasamy, A. (2004). Comment on papers "Effect of Ag substitution on the transport property and magnetoresistance of LaMnO₃" [J. Magn. Magn. Mater. 248 (2002) 26] and "Possible magnetic phase separation in Ru-doped La _0.67Ca_0.33O₃" [J. Magn. Magn. Mater. 257 (2003) 195]. Journal of Magnetism and Magnetic Materials, 270(1-2), 237-240. https://doi.org/10.1016/j.jmmm.2003.08.021

Rozenberg, E. ; Lakshmi, L. S. ; Sridharan, V. et al. / Comment on papers "Effect of Ag substitution on the transport property and magnetoresistance of LaMnO₃" [J. Magn. Magn. Mater. 248 (2002) 26] and "Possible magnetic phase separation in Ru-doped La _0.67Ca_0.33O₃" [J. Magn. Magn. Mater. 257 (2003) 195]. In: Journal of Magnetism and Magnetic Materials. 2004 ; Vol. 270, No. 1-2. pp. 237-240.

@article{6c7e03cbc3fd4c75a6be327c8a8e8c2a,

title = "Comment on papers {"}Effect of Ag substitution on the transport property and magnetoresistance of LaMnO3{"} [J. Magn. Magn. Mater. 248 (2002) 26] and {"}Possible magnetic phase separation in Ru-doped La 0.67Ca0.33O3{"} [J. Magn. Magn. Mater. 257 (2003) 195]",

abstract = "In recent papers Ye et al. (J. Magn. Magn. Mater. 248 (2002) 26) and Lakshmi et al. (J. Magn. Magn. Mater. 257 (2003) 195) reported the characteristic features of electrical resistivity (ρ) versus temperature (T) dependences of polycrystalline-doped manganites La1-xAg xMnO3 and La0.67Ca0.33Mn 1-xRuxO3. Infact, two peaks on ρ(T) curve coexist: broad one at some Tmax below the Curie points (T C) of these compounds and a sharp peak near TC. Authors interpreted such coexistence as an evidence of electronic/magnetic phase separation in the above-noted systems below its TC. It is shown in this comment that such an interpretation is obviously invalid for La 1-xAgxMnO3 system and is very questionable for La0.67Ca0.33Mn1-xRuxO3. The simplest and natural reason for the appearance of considered features on ρ(T) dependences of polycrystalline manganites is the well-known grain-boundary effects.",

keywords = "Electrical resistivity, Grain-boundary effects, Polycrystalline-doped manganites",

author = "E. Rozenberg and Lakshmi, {L. S.} and V. Sridharan and Natarajan, {D. V.} and S. Chandra and Sastry, {V. S.} and Radhakrishnan, {T. S.} and P. Pandian and Joseyphus, {R. J.} and A. Narayanasamy",

year = "2004",

month = mar,

day = "1",

doi = "10.1016/j.jmmm.2003.08.021",

language = "English",

volume = "270",

pages = "237--240",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier",

number = "1-2",

}

Rozenberg, E, Lakshmi, LS, Sridharan, V, Natarajan, DV, Chandra, S, Sastry, VS, Radhakrishnan, TS, Pandian, P, Joseyphus, RJ & Narayanasamy, A 2004, 'Comment on papers "Effect of Ag substitution on the transport property and magnetoresistance of LaMnO₃" [J. Magn. Magn. Mater. 248 (2002) 26] and "Possible magnetic phase separation in Ru-doped La _0.67Ca_0.33O₃" [J. Magn. Magn. Mater. 257 (2003) 195]', Journal of Magnetism and Magnetic Materials, vol. 270, no. 1-2, pp. 237-240. https://doi.org/10.1016/j.jmmm.2003.08.021

Comment on papers "Effect of Ag substitution on the transport property and magnetoresistance of LaMnO₃" [J. Magn. Magn. Mater. 248 (2002) 26] and "Possible magnetic phase separation in Ru-doped La _0.67Ca_0.33O₃" [J. Magn. Magn. Mater. 257 (2003) 195]. / Rozenberg, E.; Lakshmi, L. S.; Sridharan, V. et al.
In: Journal of Magnetism and Magnetic Materials, Vol. 270, No. 1-2, 01.03.2004, p. 237-240.

Research output: Contribution to journal › Comment/debate

TY - JOUR

T1 - Comment on papers "Effect of Ag substitution on the transport property and magnetoresistance of LaMnO3" [J. Magn. Magn. Mater. 248 (2002) 26] and "Possible magnetic phase separation in Ru-doped La 0.67Ca0.33O3" [J. Magn. Magn. Mater. 257 (2003) 195]

AU - Rozenberg, E.

AU - Lakshmi, L. S.

AU - Sridharan, V.

AU - Natarajan, D. V.

AU - Chandra, S.

AU - Sastry, V. S.

AU - Radhakrishnan, T. S.

AU - Pandian, P.

AU - Joseyphus, R. J.

AU - Narayanasamy, A.

PY - 2004/3/1

Y1 - 2004/3/1

N2 - In recent papers Ye et al. (J. Magn. Magn. Mater. 248 (2002) 26) and Lakshmi et al. (J. Magn. Magn. Mater. 257 (2003) 195) reported the characteristic features of electrical resistivity (ρ) versus temperature (T) dependences of polycrystalline-doped manganites La1-xAg xMnO3 and La0.67Ca0.33Mn 1-xRuxO3. Infact, two peaks on ρ(T) curve coexist: broad one at some Tmax below the Curie points (T C) of these compounds and a sharp peak near TC. Authors interpreted such coexistence as an evidence of electronic/magnetic phase separation in the above-noted systems below its TC. It is shown in this comment that such an interpretation is obviously invalid for La 1-xAgxMnO3 system and is very questionable for La0.67Ca0.33Mn1-xRuxO3. The simplest and natural reason for the appearance of considered features on ρ(T) dependences of polycrystalline manganites is the well-known grain-boundary effects.

AB - In recent papers Ye et al. (J. Magn. Magn. Mater. 248 (2002) 26) and Lakshmi et al. (J. Magn. Magn. Mater. 257 (2003) 195) reported the characteristic features of electrical resistivity (ρ) versus temperature (T) dependences of polycrystalline-doped manganites La1-xAg xMnO3 and La0.67Ca0.33Mn 1-xRuxO3. Infact, two peaks on ρ(T) curve coexist: broad one at some Tmax below the Curie points (T C) of these compounds and a sharp peak near TC. Authors interpreted such coexistence as an evidence of electronic/magnetic phase separation in the above-noted systems below its TC. It is shown in this comment that such an interpretation is obviously invalid for La 1-xAgxMnO3 system and is very questionable for La0.67Ca0.33Mn1-xRuxO3. The simplest and natural reason for the appearance of considered features on ρ(T) dependences of polycrystalline manganites is the well-known grain-boundary effects.

KW - Electrical resistivity

KW - Grain-boundary effects

KW - Polycrystalline-doped manganites

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U2 - 10.1016/j.jmmm.2003.08.021

DO - 10.1016/j.jmmm.2003.08.021

M3 - Comment/debate

AN - SCOPUS:0742320750

SN - 0304-8853

VL - 270

SP - 237

EP - 240

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 1-2

ER -

Rozenberg E, Lakshmi LS, Sridharan V, Natarajan DV, Chandra S, Sastry VS et al. Comment on papers "Effect of Ag substitution on the transport property and magnetoresistance of LaMnO₃" [J. Magn. Magn. Mater. 248 (2002) 26] and "Possible magnetic phase separation in Ru-doped La _0.67Ca_0.33O₃" [J. Magn. Magn. Mater. 257 (2003) 195]. Journal of Magnetism and Magnetic Materials. 2004 Mar 1;270(1-2):237-240. doi: 10.1016/j.jmmm.2003.08.021