Anomalous phase separation in La0.225Pr0.4Ca0.375MnO3: consequence of temperature and magnetic-field cycles

Yan, Zhihui; Liu, J.-M.

doi:10.1007/s00339-011-6284-5

Cited by 8 publications

(9 citation statements)

References 13 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…As shown in Figures (a) and (b), in the as‐grown samples, the conducting FMM domains with different sizes distribute randomly within the COI matrix without any preferred orientation. The simulation shows that the electric potential and current density vary inhomogeneous in the sample, and the current follow the paths with the least COI phase, which is in line with the percolation transport in phase‐separated manganites . As expected, the current has no preferred orientation, or in other words, the transport is isotropic.…”

Section: Resultssupporting

confidence: 78%

“…Both ferromagnetic metallic (FMM) and charge‐ordered insulator (COI) phases with vastly different resistive and magnetic characters exist and compete with each other in some mixed‐valence manganites, which is believed to be the key ingredient in the well‐known colossal magnetoresistance (CMR) effect, one of the most fascinating phenomena in condensed matter physics . Because of the energetic degeneracy of ground states, the electronic phase separation (EPS) in manganite can be modulated to a large degree by factors like temperature, magnetic field, substrate strain, and so on, leading to rich phenomena . For example, an earlier report of La 0.7 Ca 0.15 Sr 0.15 MnO 3 thin films grown on ferroelectric single‐crystal substrates demonstrated that an in‐plane tensile strain induced by the ferroelectric poling leads to a weakening of the electron‐lattice coupling and thus a decrease (increase) in resistance (ferromagnetism) .…”

Section: Introductionmentioning

confidence: 99%

“…Since the phase‐separated domains in manganite films have nanometer‐to‐micrometer dimensions, patterning the materials with the comparable scales will effectively manipulate their physical properties. Indeed, earlier reports have shown that the transport property of manganites changes dramatically after the films was patterned into structures with widths of micrometers or narrower . However, patterning thin films in top‐down approaches usually entails costly and time‐consuming lithography and etching processes, and the device outputs are quite limited.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Anisotropic Imprint of Amorphization and Phase Separation in Manganite Thin Films via Laser Interference Irradiation

Ding

Lin

et al. 2014

Small

View full text Add to dashboard Cite

Materials with mesoscopic structural and electronic phase separation, either inherent from synthesis or created via external means, are known to exhibit functionalities absent in the homogeneous counterparts. One of the most notable examples is the colossal magnetoresistance discovered in mixed-valence manganites, where the coexistence of nano- to micrometer-sized phase-separated domains dictates the magnetotransport. However, it remains challenging to pattern and process such materials into predesigned structures and devices. In this work, a direct laser interference irradiation (LII) method is employed to produce periodic stripes in thin films of a prototypical phase-separated manganite Pr0.65 (Ca0.75 Sr0.25 )0.35 MnO3 (PCSMO). LII induces selective structural amorphization within the crystalline PCSMO matrix, forming arrays with dimensions commensurate with the laser wavelength. Furthermore, because the length scale of LII modification is compatible to that of phase separation in PCSMO, three orders of magnitude of increase in magnetoresistance and significant in-plane transport anisotropy are observed in treated PCSMO thin films. Our results show that LII is a rapid, cost-effective and contamination-free technique to tailor and improve the physical properties of manganite thin films, and it is promising to be generalized to other functional materials.

show abstract

Section: Resultssupporting

confidence: 78%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Anisotropic Imprint of Amorphization and Phase Separation in Manganite Thin Films via Laser Interference Irradiation

Ding

Lin

et al. 2014

Small

View full text Add to dashboard Cite

show abstract

“…Depending upon the thermal and magnetic history, LCMO exhibits a competition between FM and antiferromagnetic (AFM) states [6,10] in both tetragonal as well as orthorhombic structures [11,12] with growth of nano phase regions below T C [1]. LCMO is reported to exhibit change in crystal symmetry (T C = 225 K) along with a transition from paramagnetic (PM) to ferromagnetic metal (FMM) and then further to a charge exchange type antiferromagnetic insulating (CE-AFI) phase below T N = 155 K [6,12].…”

Section: Introductionmentioning

confidence: 99%

Correlating melting and collapse of charge ordering with magnetic transitions in La 0.5-x Pr x Ca 0.5 MnO 3

Nadeem

Iqbal

Farhan

et al. 2016

Materials Research Bulletin

View full text Add to dashboard Cite

“…The magnetic and electronic properties vary greatly with different thermal or magnetic field cycling. 38 To directly examine the evolution of various EPS states with the magnetic field, magnetoresistance (MR), (H), has been measured at several temperatures for S2 and S3 along the two in-plane directions. Fig.…”

Section: B Static Anisotropic Transport: Magnetic Field Dependencementioning

confidence: 99%

Static and dynamic signatures of anisotropic electronic phase separation in La2/3Ca1/3MnO3 thin films under

Xiong

et al. 2018

Phys. Rev. B

View full text Add to dashboard Cite

The electronic phase separation (EPS) of optimally doped La2/3Ca1/3MnO3 (LCMO) thin films under various degrees of anisotropic strain is investigated by static magnetotransport and dynamic relaxation measurements. Three LCMO films were grown simultaneously on (001) NdGaO3 (NGO) substrates by pulsed laser deposition, and then post-growth annealed at 780 o C in O2 for different durations of time. With increasing annealing time, the films developed significant strains of opposite signs along the two orthogonal in-plane directions. The static temperature-dependent resistivity, (T), was measured simultaneously along the two orthogonal directions. With increasing annealing time, both zero-field-cooled and field-cooled (T) show significant increases, suggesting strain-triggered EPS and appearance of antiferromagnetic insulating (AFI) phases in a ferromagnetic metallic (FMM) ground state. Meanwhile, (T) along the tensile-strained [010] direction becomes progressively larger than that along the compressive-strained [100]. The enhanced resistivity anisotropy indicates that the EPS is characterized by phase-separated FMM entities with a preferred orientation along [100], possibly due to the cooperative deformation and rotation/tilting of the MnO6 octahedra under the enhanced anisotropic strain. The anisotropic EPS can also be tuned by an external magnetic field. During a field-cycle at several fixed temperatures, the AFI phases are melted at high fields and recovered at low fields, resulting in sharp resistance changes of ratio as high as 10 4 . Furthermore, the resistivity was found to exhibit glass-like behavior, relaxing logarithmically in the phaseseparated states. Fitting the data to a phenomenological model, the resulting resistive viscosity and characteristic relaxation time are found to evolve with temperature, showing a close correlation with the static measurements in the EPS states.

show abstract

Anomalous phase separation in La0.225Pr0.4Ca0.375MnO3: consequence of temperature and magnetic-field cycles

Cited by 8 publications

References 13 publications

Anisotropic Imprint of Amorphization and Phase Separation in Manganite Thin Films via Laser Interference Irradiation

Anisotropic Imprint of Amorphization and Phase Separation in Manganite Thin Films via Laser Interference Irradiation

Correlating melting and collapse of charge ordering with magnetic transitions in La 0.5-x Pr x Ca 0.5 MnO 3

Static and dynamic signatures of anisotropic electronic phase separation in La2/3Ca1/3MnO3 thin films under

Contact Info

Product

Resources

About