Electron spin resonance above Tc in layered manganites

N. O. Moreno; P. G. Pagliuso; C. Rettori; J. S. Gardner; J. L. Sarrao; J. D. Thompson; D. L. Huber; J. F. Mitchell; J. J. Martinez; S. B. Oseroff

doi:10.1103/PhysRevB.63.174413

Electron spin resonance above T_c in layered manganites

N. O. Moreno
, P. G. Pagliuso
, C. Rettori
, J. S. Gardner
, J. L. Sarrao
, J. D. Thompson
, D. L. Huber
, J. F. Mitchell
, J. J. Martinez
, S. B. Oseroff

Research output: Contribution to journal › Article › peer-review

31 Scopus citations

Abstract

We have performed electron spin resonance (ESR) and dc magnetization measurements on single crystals of La_2(1-x)Sr_1+2xMn₂O₇ up to 800 K with special emphasis on the x = 0.4 composition. The ESR linewidth shows behavior similar to that observed in the three-dimensional perovskites and above ∼500 K can be described by a universal expression ΔH_pp(T)=[C/T_χ(T)]ΔH_pp (∞). The linewidth and the resonance field become anisotropic below ∼500 K. The anisotropy in the resonance field is proportional to the magnetization M, and we concluded that it is intrinsic to the system. We show that demagnetization effects can explain only part of the anisotropy. The remainder arises from short-range uniaxial terms in the Hamiltonian that are associated with the crystal field and Dzialozhinsky-Moriya interactions. The anisotropy in the linewidth is attributed to the easy-plane ferromagnetic ordering, which also arises from the short-range anisotropy.

Original language	English
Article number	174413
Pages (from-to)	1744131-1744136
Number of pages	6
Journal	Physical Review B - Condensed Matter and Materials Physics
Volume	63
Issue number	17
DOIs	https://doi.org/10.1103/PhysRevB.63.174413
State	Published - 2001
Externally published	Yes

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@article{84720150e5a34bb8b8e7efea5e430643,

title = "Electron spin resonance above Tc in layered manganites",

abstract = "We have performed electron spin resonance (ESR) and dc magnetization measurements on single crystals of La2(1-x)Sr1+2xMn2O7 up to 800 K with special emphasis on the x = 0.4 composition. The ESR linewidth shows behavior similar to that observed in the three-dimensional perovskites and above ∼500 K can be described by a universal expression ΔHpp(T)=[C/Tχ(T)]ΔHpp (∞). The linewidth and the resonance field become anisotropic below ∼500 K. The anisotropy in the resonance field is proportional to the magnetization M, and we concluded that it is intrinsic to the system. We show that demagnetization effects can explain only part of the anisotropy. The remainder arises from short-range uniaxial terms in the Hamiltonian that are associated with the crystal field and Dzialozhinsky-Moriya interactions. The anisotropy in the linewidth is attributed to the easy-plane ferromagnetic ordering, which also arises from the short-range anisotropy.",

author = "Moreno, \{N. O.\} and Pagliuso, \{P. G.\} and C. Rettori and Gardner, \{J. S.\} and Sarrao, \{J. L.\} and Thompson, \{J. D.\} and Huber, \{D. L.\} and Mitchell, \{J. F.\} and Martinez, \{J. J.\} and Oseroff, \{S. B.\}",

year = "2001",

doi = "10.1103/PhysRevB.63.174413",

language = "English",

volume = "63",

pages = "1744131--1744136",

journal = "Physical Review B - Condensed Matter and Materials Physics",

issn = "0163-1829",

publisher = "American Physical Society",

number = "17",

}

TY - JOUR

T1 - Electron spin resonance above Tc in layered manganites

AU - Moreno, N. O.

AU - Pagliuso, P. G.

AU - Rettori, C.

AU - Gardner, J. S.

AU - Sarrao, J. L.

AU - Thompson, J. D.

AU - Huber, D. L.

AU - Mitchell, J. F.

AU - Martinez, J. J.

AU - Oseroff, S. B.

PY - 2001

Y1 - 2001

N2 - We have performed electron spin resonance (ESR) and dc magnetization measurements on single crystals of La2(1-x)Sr1+2xMn2O7 up to 800 K with special emphasis on the x = 0.4 composition. The ESR linewidth shows behavior similar to that observed in the three-dimensional perovskites and above ∼500 K can be described by a universal expression ΔHpp(T)=[C/Tχ(T)]ΔHpp (∞). The linewidth and the resonance field become anisotropic below ∼500 K. The anisotropy in the resonance field is proportional to the magnetization M, and we concluded that it is intrinsic to the system. We show that demagnetization effects can explain only part of the anisotropy. The remainder arises from short-range uniaxial terms in the Hamiltonian that are associated with the crystal field and Dzialozhinsky-Moriya interactions. The anisotropy in the linewidth is attributed to the easy-plane ferromagnetic ordering, which also arises from the short-range anisotropy.

AB - We have performed electron spin resonance (ESR) and dc magnetization measurements on single crystals of La2(1-x)Sr1+2xMn2O7 up to 800 K with special emphasis on the x = 0.4 composition. The ESR linewidth shows behavior similar to that observed in the three-dimensional perovskites and above ∼500 K can be described by a universal expression ΔHpp(T)=[C/Tχ(T)]ΔHpp (∞). The linewidth and the resonance field become anisotropic below ∼500 K. The anisotropy in the resonance field is proportional to the magnetization M, and we concluded that it is intrinsic to the system. We show that demagnetization effects can explain only part of the anisotropy. The remainder arises from short-range uniaxial terms in the Hamiltonian that are associated with the crystal field and Dzialozhinsky-Moriya interactions. The anisotropy in the linewidth is attributed to the easy-plane ferromagnetic ordering, which also arises from the short-range anisotropy.

UR - https://www.scopus.com/pages/publications/0034896367

U2 - 10.1103/PhysRevB.63.174413

DO - 10.1103/PhysRevB.63.174413

M3 - Article

AN - SCOPUS:0034896367

SN - 0163-1829

VL - 63

SP - 1744131

EP - 1744136

JO - Physical Review B - Condensed Matter and Materials Physics

JF - Physical Review B - Condensed Matter and Materials Physics

IS - 17

M1 - 174413

ER -

Electron spin resonance above T_c in layered manganites

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