Study of irradiation induced changes in La0.7Pb0.3MnO3
TL;DR: In this paper, a typical giant magnetoresistive (GMR) sample viz. La 0.7 Pb 0.3 MnO 3 has been irradiated by 50 MeV Li 3+ ion beam.
About: This article is published in Radiation Measurements.The article was published on 2003-06-01. It has received 5 citations till now. The article focuses on the topics: Magnetoresistance.
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01 Apr 2005-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this article, the effects of ion irradiation on the transport properties of polycrystalline La0.5Pb 0.5Mn1−xCrxO3 (x = 0.075 and 0.15) samples have been studied by means of the temperature and magnetic field dependent resistivity measurements.
Abstract: Polycrystalline La0.5Pb0.5Mn1−xCrxO3 (x = 0.075 and 0.15) samples have been irradiated with 50 MeV Li3+ ions with different fluences and the effects on the transport properties have been studied by means of the temperature and magnetic field dependent resistivity measurements. Due to Li3+ ion irradiation, the resistivity increases and the metal–insulator transition temperature (Tmi) decreases. At low temperatures (below Tmi), a dominant contribution of the electron–magnon scattering process is observed for all the irradiated and unirradiated samples. The low temperature resistivity behavior as well as the magnetoresistance is modified due to irradiation. The changes in the magnetotransport properties due to irradiation have been compared with the changes caused due to Mn site substitution.
17 citations
01 Jan 2016-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this paper, the effect of electron beam irradiation on structural, electrical and thermal properties of Gd0.5Sr 0.5MnO3 manganites was investigated.
Abstract: We present systematic studies on the effect of electron beam irradiation on structural, electrical and thermal properties of Gd0.5Sr0.5MnO3 and Dy0.5Sr0.5MnO3 manganites. The XRD patterns and Rietveld analysis show that the samples remain single phased even after they undergo electron beam irradiation. Both the series of the samples Gd0.5Sr0.5MnO3 and Dy0.5Sr0.5MnO3 show insulating trends in their temperature dependent electrical resistivity, ρ(T) behavior. The resistivity data for both the series of samples (pristine as well as irradiated) indicate that the small polaron hopping model is valid in high temperature region; on contrary, variable range hopping model governs the low temperature regime. Magnetic studies demonstrate that the Neel temperatures of pristine and irradiated samples of Gd0.5Sr0.5MnO3 and Dy0.5Sr0.5MnO3 do not change appreciably when they are subjected to irradiation. Thermo-electrical power is observed to increase with irradiation in Gd0.5Sr0.5MnO3 samples, whereas for Dy0.5Sr0.5MnO3 samples a decrease in thermo-electric power is seen when the samples are irradiated.
16 citations
01 Nov 2004-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this article, the low temperature (below the metal-insulator transition temperature Tim) resistivity and magnetoresistance (MR) behavior of 50 MeV Li3+ beam irradiated La 0.7Pb0.3MnO3 for three different fluences were reported.
Abstract: We report the low temperature (below the metal–insulator transition temperature Tim) resistivity and magnetoresistance (MR) behavior of 50 MeV Li3+ beam irradiated La0.7Pb0.3MnO3 for three different fluences. Ion beam irradiation causes a decrease of Tim leading to the increase of insulating regime. Resistivity data of the unirradiated as well as irradiated samples fitted well with an equation of the form ρ = ρ0 + ρ2.5T2.5 which indicates predominant contribution from the electron–magnon interaction (second term). The temperature dependent MR data of samples irradiated with different ion fluences follow the simple relation [MR = a + b/(T + C)] showing appreciable effect of radiation on the parameters a, b and C. The physical significance of the radiation effect on these parameters is not yet very clear.
16 citations
TL;DR: In this article, the effect of 90 MeV heavy ion irradiation on the surface morphology, transport and magnetic properties of La0.9Pb0.1MnO3 (LPMO) single crystals has been reported.
9 citations
01 Mar 2006-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this paper, the effect of disorder on Bi-2212 type high Tc superconducting and LCMO type CMR oxide materials has been investigated and results have been discussed in the light of their intrinsic granular nature.
Abstract: Present report deals with the effect of disorder on Bi-2212 type high Tc superconducting and LCMO type CMR oxide materials. Ion irradiation (50 MeV Li3+ beam) creates high level of disorder in the superconducting system and as a result increase of room temperature resistivity (ρ300) has been observed. Radiation induced point defects cause an increased dρ/dT in the metal-like regime of Bi-2212. Similar increase of dρ/dT in the FM (ferromagnetic and metal-like) state has also been found in LCMO system. Enhancement of metal-like behavior is unusual in the sense that a simultaneous decrease of Tmi (metal–insulator transition temperature for LCMO) or Tc (superconducting transition temperature for Bi-2212) due to irradiation has also been observed. Effect of the defects incorporated by other means like variation of heat treatment and ion irradiation has been investigated for a better understanding on the electrical transport in these complex materials. Results have been discussed in the light of their intrinsic granular nature.
4 citations
References
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TL;DR: In this article, the influence of swift heavy ion (SHI) irradiation on transport properties of epitaxial thin films of La0.75Ca0.25MnO3 (LCMO) is studied.
Abstract: The influence of swift heavy ion (SHI) irradiation on transport properties of epitaxial thin films of La0.75Ca0.25MnO3 (LCMO) is studied. The films were irradiated with 90 MeV16O beams and 250 MeV107 Ag beams at different fluence values. In the case of 90 MeV16O ions LCMO specimens were irradiated to 1011-1014 ions/cm2 and for 250 MeV107Ag ions with 1010–1013 ions/cm2. A systematic variation in Curie temperature (T c) or resistivity peak temperature (T p) has been observed. It has been noted that for both types of ions the T p increased for the specimen irradiated at 1011 ions/cm2 fluence. Further increase of fluence decreased the T p value and at higher fluence (1014 ions/cm2 for 90 MeV16O and 1013 ions/cm2 for 250 MeV107 Ag ions) the specimens showed no metal-to-insulator transition even at low temperature down to 77K. They show completely semiconducting behavior with high resistance values. These results are discussed in terms of SHI irradiation-induced structural distrotion and strain on thin...
37 citations
TL;DR: In this paper, thin films of colossal magnetoresistance (MR) material, La0.67Ca0.33MnO3, were implanted with different doses (1011-1015 ions/cm2) of 200 keV Ar+ ions.
Abstract: Thin films of colossal magnetoresistance (MR) material, La0.67Ca0.33MnO3, were implanted with different doses (1011–1015 ions/cm2) of 200 keV Ar+ ions. The implanted samples were examined by ion channeling and x‐ray diffraction techniques. The channeling results clearly showed that the magnitude of the induced lattice disorder did not increase greatly for implantation doses up to 5×1013 ions/cm2. In this low dose implantation regime, the magnetoresistance {MR=[R(0)−R(H)]/R(0)} increased by 50%, the peak resistivity went up by two orders of magnitude, and the magnetoresistivity peak temperature decreased by 130 K compared to the original, unimplanted sample. For doses ≥5×1013 ions/cm2, the damage was significant and caused the sample to become semiconducting.
35 citations
02 May 1997-Nuclear Instruments & Methods in Physics Research Section B-beam Interactions With Materials and Atoms
TL;DR: In this paper, the authors provide a fundamental understanding of the damage process in a variety of pure metals, intermetallic compounds, and pure Si and highlight the special role of surfaces on damage production.
Abstract: Irradiation of solids with energetic particles leads to the production of lattice defects in the form of Frenkel pairs, anti-site defects, defect clusters, dislocation loops and amorphous zones in the bulk and to sputtered atoms, adatoms, and craters near the surface. Predicting which types of damage prevail in specific situations has been a difficult chore; however, recent developments in computer simulations have greatly facilitated this task. This review highlights the results of these simulations and provides a fundamental understanding of the damage process in a variety of pure metals, intermetallic compounds, and pure Si. The special role of surfaces on damage production is a central focus of this work. In addition, recent experimental investigations of alloy disordering in Cu 3 Au during 1 MeV He bombardment and STM imaging of single ion impacts on Pt will be reviewed to illustrate the level of accuracy that has now been achieved by these simulations.
31 citations
TL;DR: In this article, columnar amorphization and structural symmetry changes produced by 250 MeV Ag+17 ion irradiation in epitaxial thin films of YBa2Cu3O7−y were studied using scanning tunneling microscopy (STM).
29 citations
TL;DR: Magnetization and resistivity measurements for a series of radiation damaged La07Ca03MnO3 pulsed laser deposited thin films were reported in this article, showing that the magnetic order is no longer sufficient to delocalize the system of the extra disorder induced by the radiation damage.
Abstract: Magnetization and resistivity measurements are reported for a series of radiation damaged La07Ca03MnO3 pulsed laser deposited thin films When plotted as a function of activation energy, trends in the electrical transport properties are similar to those exhibited in the magnetic properties A sharp drop in both Tc and Tp in samples with activation energies greater than ∼110 meV suggests a “decoupling” of the magnetic and transport properties The results suggest the magnetic order is no longer sufficient to delocalize the system of the extra disorder induced by the radiation damage
23 citations