Observation of Two Time Scales in the Ferromagnetic Manganite<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>La</mml:mi></mml:mrow><mml:mrow><mml:mn>1</mml:mn><mml:mo>−</mml:mo><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>Ca</mml:mi></mml:mrow><mml:mrow><mml:mi mathvariant="italic">x</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>MnO</mml:mi></mml:

Heffner, R. H.; Sonier, J. E.; MacLaughlin, D. E.; Nieuwenhuys, G.J.; Ehlers, Georg; Mezei, F.; Cheong, Sang‐Wook; Gardner, J. S.; Röder, Heinrich

doi:10.1103/physrevlett.85.3285

Cited by 107 publications

(58 citation statements)

References 30 publications

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“…4,5,6,7 As a consequence, the majority of works, early focused around the optimum doping level for TC of x∼3/8, are now moving toward x∼1/2, where the competition between these phases can be better studied. 8,9,10 At the 1:1 Mn 3+ :Mn 4+ composition, charge ordering (CO), that inhibits the electron transfer associated with Double Exchange-Ferromagnetism (DE-FM) in manganites 11 , is particularly feasible, leading to a rich variety of charge/orbital ordered (CO/OO) structures.…”

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confidence: 99%

Coexistence of paramagnetic-charge-ordered and ferromagnetic-metallic phases in La0.5Ca0.5MnO3 evidenced by electron spin resonance

Rivadulla

Freita-Alvite

López‐Quintela

et al. 2002

Journal of Applied Physics

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Abstract. Throughout a complete Electron Spin Resonance (ESR) and magnetization study of La0.5Ca0.5MnO3, we discuss about the nature of the complex phase-segregated state established in this compound below T∼210 K. Between TN≤T≤TC, the ESR spectra shows two lines characteristic of two different magnetic phases. From the resonance field (Hr) derived for each line we argue that the incommensurate-charge-ordering phase (ICO) which coexists with ferromagnetic-metallic (FMM) clusters in this temperature interval, is mainly paramagnetic and not antiferromagnetic. The FMM/ICO ratio can be tuned with a relatively small field, which suggests that the internal energy associated with those phases is very similar. Below TN, there is an appreciable FM contribution to the magnetization and the ESR spectra indicates the presence of FM clusters in an antiferromagnetic matrix (canted). Our results show that ESR could be a very useful tool to investigate the nature of the phase-separated state now believed to play a fundamental role in the physics of mixed valent manganites.

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confidence: 99%

Coexistence of paramagnetic-charge-ordered and ferromagnetic-metallic phases in La0.5Ca0.5MnO3 evidenced by electron spin resonance

Rivadulla

Freita-Alvite

López‐Quintela

et al. 2002

Journal of Applied Physics

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“…The muon sensitivity to short-range order and other forms of disordered magnetism (cluster-glass, spin-glass) has been used to study the magnetic inhomogeneities at low temperature in systems such as CeCu 2 37 among others. In these examples, the different spin dynamics (namely multiple spin fluctuation rates) detected by the analysis of the μSR spectra are a signature of heterogeneous magnetic phases, including ordered clusters within the paramagnetic regime.…”

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confidence: 99%

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

et al. 2011

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Zero-field muon spin relaxation spectroscopy (μSR) measurements in the paramagnetic phase of ErCo 2 ferrimagnetic system are reported. Previous experimental studies using macro-and microscopic techniques led to the identification of magnetic short-range correlations between the Co atoms in the paramagnetic state of this material. The analysis of μSR spectra recorded on ErCo 2 well above T c indicates two dynamical magnetic processes characterized by remarkably different relaxation rates: a slow-relaxing signal, which quantitatively coincides with previous μSR studies on ErAl 2 , and fast-relaxing signal, which can be ascribed to the Co short-range correlated regions observed above T c . Moreover, the μSR technique provides information on the thermal dependence of Co correlated regions at true zero field. These findings shed light on the dynamical nature of the clustered phase developing in the paramagnetic state of ErCo 2 .

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“…3 Last decade, the formation of inhomogeneous states, referred as phase separation, was discovered in doped La 1-x (Ca,Sr) x MnO 3 manganites. There was observed with muon spin relaxation measurements, 4 Mössbauer spectroscopy 5 and nuclear magnetic resonance (NMR) 6 that ferromagnetic phase is inhomogeneous and decomposes into at least two ferromagnetic phases. The phases are characterized by different DE interaction, magnetic Zeeman splitting, rate of hopping of electron holes among the Mn 3þ /Mn 4þ sites, etc.…”

Section: Introductionmentioning

confidence: 99%

Local structure and magnetic inhomogeneity of nano-sized La0.7Sr0.3MnO3 manganites

Ulyanov

Yang

Mazur

et al. 2011

Journal of Applied Physics

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We present the study of the local structure and magnetic inhomogeneity of nano-sized La0.7Sr0.3MnO3 manganites performed by x-ray absorption fine structure (XAFS) spectroscopy and nuclear magnetic resonance (NMR). Nano-powders with particle size of 50–200 nm (NP1) and 20 nm (NP2), and bulk samples (BS) were studied. EXAFS data show the difference between the local structure of core and outer shell of the nano-particle. The data evidenced that the shell of particles presents the disordered crystalline array. According to the NMR, at low temperature the magnetic state of NP1 sample is homogenous. However, with increase of temperature the two ferromagnetic phases, with strong and weakened double exchange, coexist. The NP2 powder is magnetically homogeneous and characterized by weakened double exchange at all temperatures of the existence of the magneto-ordered state. The results specify on possible existence of characteristic spatial scale below which the phase stratification becomes energetically unfavorable.

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Observation of Two Time Scales in the Ferromagnetic ManganiteLa1−xCaxMnO

Cited by 107 publications

References 30 publications

Coexistence of paramagnetic-charge-ordered and ferromagnetic-metallic phases in La0.5Ca0.5MnO3 evidenced by electron spin resonance

Coexistence of paramagnetic-charge-ordered and ferromagnetic-metallic phases in La0.5Ca0.5MnO3 evidenced by electron spin resonance

μSR study of short-range magnetic order in the paramagnetic regime of ErCo2

Local structure and magnetic inhomogeneity of nano-sized La0.7Sr0.3MnO3 manganites

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