Study of the CMR manganites La0.82Ca0.18MnO3 and La0.85Sr0.15MnO3 by μSR method

Barsov, S.; Getalov, A. L.; Koptev, V.; Kotov, S.; Mikirtychyants, S.; Shcherbakov, G. V.; Arsenov, A. A.; Mukovskiǐ, Ya. M.

doi:10.1016/s0921-4526(00)00267-2

Cited by 13 publications

(7 citation statements)

References 9 publications

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“…As shown in Ref. [37], the Hamiltonian (1) is improved for λ = λ * ≈ 4.4 (7). Here, we extend the simulations of Ref.…”

supporting

confidence: 80%

“…We measured the Binder parameter U 4 , its sixth-order generalization U 6 , the second-moment correlation length ξ 2nd , and the ratio Z a /Z p , where Z a is the partition function with anti-periodic boundary conditions in one of the three directions and Z p the corresponding one with periodic boundary conditions in all directions. The number of iterations for each lattice size and value of λ was approximately 10 7 for L = 6,7,8,9,10,11,12,14,16,18,20,22 , we have added new lattice sizes for all three values of λ and considerably increased the statistics. In total, the whole study took about four years on a single 450 MHz Pentium III CPU.…”

Section: Monte Carlo Simulationsmentioning

confidence: 99%

See 1 more Smart Citation

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Campostrini

Hasenbusch²,

Pelissetto³

et al. 2002

Phys. Rev. B

475

414

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We improve the theoretical estimates of the critical exponents for the threedimensional Heisenberg universality class. We find γ = 1.3960(9), ν = 0.7112(5), η = 0.0375(5), α = −0.1336(15), β = 0.3689(3), and δ = 4.783(3). We consider an improved lattice φ 4 Hamiltonian with suppressed leading scaling corrections. Our results are obtained by combining Monte Carlo simulations based on finite-size scaling methods and high-temperature expansions. The critical exponents are computed from high-temperature expansions specialized to the φ 4 improved model. By the same technique we determine the coefficients of the small-magnetization expansion of the equation of state. This expansion is extended analytically by means of approximate parametric representations, obtaining the equation of state in the whole critical region. We also determine a number of universal amplitude ratios.

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“…As shown in Ref. [37], the Hamiltonian (1) is improved for λ = λ * ≈ 4.4 (7). Here, we extend the simulations of Ref.…”

supporting

confidence: 80%

Section: Monte Carlo Simulationsmentioning

confidence: 99%

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Campostrini

Hasenbusch²,

Pelissetto³

et al. 2002

Phys. Rev. B

475

414

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show abstract

“…This distribution may originate from spatially inhomogeneous spin dynamics, as observed by µSR experiments in the A-site disordered ferromagnetic manganites, such as La 1−x Ca x MnO 3 (x = 0.18, 0.33 and 0.375) and La 0.85 Sr 0.15 MnO 3 . 26,[28][29][30][31][32] These facts are consistent with the two-phase interpretation of a percolation theory. 33 This result suggests that the microscopic magnetic properties of the FM phase in LaBaMn 2 O 6 are similar to those in the A-site disordered ferromagnetic manganites, irrespectively of the existence of order/disorder at the A site.…”

Section: B Labamn2o6supporting

confidence: 84%

μSR investigation of magnetically ordered states in theA-site ordered perovskite manganitesRBaMn2
Kawasaki
¹
,
Minami
²
,
Izumi
³

et al. 2012
Phys. Rev. B
4
0
3
0
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The magnetically ordered states of the A-site ordered perovskite manganites LaBaMn2O6 and YBaMn2O6 have been investigated by muon spin relaxation in zero external magnetic field. Our data reveal striking differences in the nature of the magnetically ordered state between these materials. For LaBaMn2O6, the µSR time-spectra in the ferromagnetic state below ≃ 330 K reveal a strongly inhomogeneous phase, reminiscent of a Griffiths phase. Within this magnetically inhomogeneous phase, an antiferromagnetic state develops below 150 K, which displays well defined static internal magnetic fields, but reaches only 30% of the volume fraction at low temperatures. A broad distribution of µSR relaxation rates is inferred down to the lowest temperatures. This behavior is similar to that in the A-site disordered La0.5Ba0.5MnO3. On the other hand, for YBaMn2O6, the µSR time spectra for both (i) the charge and orbital ordered and (ii) the paramagnetic phases reveal rather homogeneous states, namely, an exponential relaxation in the paramagnetic state and well defined muon spin oscillation in the antiferromagnetic state.

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“…It was believed that at optimal doping of this system, the magnetism is homogeneous. But muons showed that there are multiple relaxation channels below T c [43,93,94,95], which have been interpreted as conducting regions forming as the temperature is lowered below T c . For a detailed discussion of the series of results reported, and a discussion of their context, we direct the readers to a review written by some of the key researchers in this field [19].…”

Section: Critical Point Spin Dynamicsmentioning

confidence: 99%

Muon spin spectroscopy: magnetism, soft matter and the bridge between the two

Nuccio

Schulz

Drew

2014

J. Phys. D: Appl. Phys.

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The use of implanted muons to probe the spin dynamics and electronic excitations in a variety of magnetic and non-magnetic materials is reviewed and is split into three main sections, the first of which is an introduction to the historical context and background of the muon technique, which includes a basic introduction to the experimental method and underlying theoretical models. The second section is concerned with inorganic magnetic systems, starting with an overview of spin dynamics around critical points in ordered magnets. This is followed by an introduction to the early work on spin glasses, liquids and ices, which then continues onto the recent research in this area, including a discussion of some of the more controversial recent work on spin ices and magnetic monopoles. Information obtained by muons vital to two very important technological areas -magnetic semiconductors and next-generation energy materials -closes the discussion of inorganic magnetic materials. The final section is concerned with spin dynamics and magnetism in soft materials, and starts with discussing many of the key results in molecular magnets and organic spintronics. Spin dynamics in organic semiconductors, polymers and biological molecules is then covered, where contradictory experimental and theoretical work on charge carrier motion is presented. The similarities between the low-field relaxation rates in these "conducting" organic materials is compared to measurements of the electron spin relaxation measured in localised electronic states, obtained from high-field avoided level crossing spectroscopy in similar (and the same) materials.

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Study of the CMR manganites La0.82Ca0.18MnO3 and La0.85Sr0.15MnO3 by μSR method

Cited by 13 publications

References 9 publications

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

μSR investigation of magnetically ordered states in theA-site ordered perovskite manganitesRBaMn2
Kawasaki
¹
,
Minami
²
,
Izumi
³

et al. 2012
Phys. Rev. B
4
0
3
0
View full text Add to dashboard Cite

Muon spin spectroscopy: magnetism, soft matter and the bridge between the two

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Study of the CMR manganites La0.82Ca0.18MnO3 and La0.85Sr0.15MnO3 by μSR method

Cited by 13 publications

References 9 publications

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

Critical exponents and equation of state of the three-dimensional Heisenberg universality class

μSR investigation of magnetically ordered states in theA-site ordered perovskite manganitesRBaMn2Kawasaki1, Minami2, Izumi3 et al. 2012Phys. Rev. B4030View full textAdd to dashboardCite

Muon spin spectroscopy: magnetism, soft matter and the bridge between the two

Contact Info

Product

Resources

About

μSR investigation of magnetically ordered states in theA-site ordered perovskite manganitesRBaMn2
Kawasaki
¹
,
Minami
²
,
Izumi
³

et al. 2012
Phys. Rev. B
4
0
3
0
View full text Add to dashboard Cite