Magnetic resonance in crystalline La0.9Ca0.1MnO 3: Comparative study of bulk and nanometer-sized samples

Alexander Shames; Mark Auslender; Evgeny Rosenberg; Gad Gorodetsky; E. Sominski; A. Gedanken; Ya M. Mukovskii

doi:10.1016/j.jmmm.2005.10.023

Magnetic resonance in crystalline La_0.9Ca_0.1MnO ₃: Comparative study of bulk and nanometer-sized samples

Alexander Shames, Mark Auslender, Evgeny Rosenberg, Gad Gorodetsky, E. Sominski, A. Gedanken, Ya M. Mukovskii

Research output: Contribution to journal › Conference article › peer-review

18 Scopus citations

Abstract

X-band electron magnetic resonance (EMR) measurements were done at 115≤T≤600 K on bulk and nanometer size-grain powder single-crystalline samples of La_0.9Ca_0.1MnO₃, in order to study an impact of structural inhomogeneity on magnetic ordering. For the nano-crystal sample, two superimposed EMR lines are observed below 240 K, while for bulk-crystal one, a second line emerges in narrow temperature interval below 130 K. Temperature dependences of resonance field and line width of the main and the secondary line are drastically different. EMR data and complementary magnetic measurements of bulk-crystal sample reveal mixed-magnetic phase, which agrees with the published phase diagram of bulk La_1- _xCa_xMnO₃. In a marked contrast, the same analysis for nano-crystal sample shows two phases one of which is definitely ferromagnetic (FM) and other is likely such, or super paramagnetic. The data obtained are interpreted in terms of very different magnetic ground states in the two samples, that is attributed to different randomness of the indirect FM exchange interactions mediated by bound holes.

Original language	English
Pages (from-to)	12-15
Number of pages	4
Journal	Journal of Magnetism and Magnetic Materials
Volume	300
Issue number	1
DOIs	https://doi.org/10.1016/j.jmmm.2005.10.023
State	Published - 1 May 2006
Externally published	Yes
Event	Third International Symposium on Magnetism 2005 - Duration: 26 Jun 2005 → 30 Jun 2005

Keywords

CMR manganites
Ferromagnetic and electron paramagnetic resonance

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

Access to Document

10.1016/j.jmmm.2005.10.023

Cite this

@article{eee7bd49965443448c4f3ce9e5f4c28d,

title = "Magnetic resonance in crystalline La0.9Ca0.1MnO 3: Comparative study of bulk and nanometer-sized samples",

abstract = "X-band electron magnetic resonance (EMR) measurements were done at 115≤T≤600 K on bulk and nanometer size-grain powder single-crystalline samples of La0.9Ca0.1MnO3, in order to study an impact of structural inhomogeneity on magnetic ordering. For the nano-crystal sample, two superimposed EMR lines are observed below 240 K, while for bulk-crystal one, a second line emerges in narrow temperature interval below 130 K. Temperature dependences of resonance field and line width of the main and the secondary line are drastically different. EMR data and complementary magnetic measurements of bulk-crystal sample reveal mixed-magnetic phase, which agrees with the published phase diagram of bulk La1- xCaxMnO3. In a marked contrast, the same analysis for nano-crystal sample shows two phases one of which is definitely ferromagnetic (FM) and other is likely such, or super paramagnetic. The data obtained are interpreted in terms of very different magnetic ground states in the two samples, that is attributed to different randomness of the indirect FM exchange interactions mediated by bound holes.",

keywords = "CMR manganites, Ferromagnetic and electron paramagnetic resonance",

author = "Alexander Shames and Mark Auslender and Evgeny Rosenberg and Gad Gorodetsky and E. Sominski and A. Gedanken and Mukovskii, {Ya M.}",

year = "2006",

month = may,

day = "1",

doi = "10.1016/j.jmmm.2005.10.023",

language = "English",

volume = "300",

pages = "12--15",

journal = "Journal of Magnetism and Magnetic Materials",

issn = "0304-8853",

publisher = "Elsevier B.V.",

number = "1",

note = "Third International Symposium on Magnetism 2005 ; Conference date: 26-06-2005 Through 30-06-2005",

}

TY - JOUR

T1 - Magnetic resonance in crystalline La0.9Ca0.1MnO 3

T2 - Third International Symposium on Magnetism 2005

AU - Shames, Alexander

AU - Auslender, Mark

AU - Rosenberg, Evgeny

AU - Gorodetsky, Gad

AU - Sominski, E.

AU - Gedanken, A.

AU - Mukovskii, Ya M.

PY - 2006/5/1

Y1 - 2006/5/1

N2 - X-band electron magnetic resonance (EMR) measurements were done at 115≤T≤600 K on bulk and nanometer size-grain powder single-crystalline samples of La0.9Ca0.1MnO3, in order to study an impact of structural inhomogeneity on magnetic ordering. For the nano-crystal sample, two superimposed EMR lines are observed below 240 K, while for bulk-crystal one, a second line emerges in narrow temperature interval below 130 K. Temperature dependences of resonance field and line width of the main and the secondary line are drastically different. EMR data and complementary magnetic measurements of bulk-crystal sample reveal mixed-magnetic phase, which agrees with the published phase diagram of bulk La1- xCaxMnO3. In a marked contrast, the same analysis for nano-crystal sample shows two phases one of which is definitely ferromagnetic (FM) and other is likely such, or super paramagnetic. The data obtained are interpreted in terms of very different magnetic ground states in the two samples, that is attributed to different randomness of the indirect FM exchange interactions mediated by bound holes.

AB - X-band electron magnetic resonance (EMR) measurements were done at 115≤T≤600 K on bulk and nanometer size-grain powder single-crystalline samples of La0.9Ca0.1MnO3, in order to study an impact of structural inhomogeneity on magnetic ordering. For the nano-crystal sample, two superimposed EMR lines are observed below 240 K, while for bulk-crystal one, a second line emerges in narrow temperature interval below 130 K. Temperature dependences of resonance field and line width of the main and the secondary line are drastically different. EMR data and complementary magnetic measurements of bulk-crystal sample reveal mixed-magnetic phase, which agrees with the published phase diagram of bulk La1- xCaxMnO3. In a marked contrast, the same analysis for nano-crystal sample shows two phases one of which is definitely ferromagnetic (FM) and other is likely such, or super paramagnetic. The data obtained are interpreted in terms of very different magnetic ground states in the two samples, that is attributed to different randomness of the indirect FM exchange interactions mediated by bound holes.

KW - CMR manganites

KW - Ferromagnetic and electron paramagnetic resonance

UR - http://www.scopus.com/inward/record.url?scp=33644700221&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2005.10.023

DO - 10.1016/j.jmmm.2005.10.023

M3 - Conference article

AN - SCOPUS:33644700221

SN - 0304-8853

VL - 300

SP - 12

EP - 15

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

IS - 1

Y2 - 26 June 2005 through 30 June 2005

ER -