Silver ion implantation in epitaxial La2/3Ca1/3MnO3 thin films: Large temperature coefficient of resistance for bolometric applications

Bathe, Ravi; Adhi, K. P.; Patil, S. I.; Marest, G.; Hannoyer, B.; Ogale, Satishchandra

doi:10.1063/1.126269

Cited by 51 publications

(32 citation statements)

References 20 publications

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“…17 Interest in lanthanum manganite has been rekindled in the last few years due to the observation of large magnetoresistance in films deposited by pulsed laser deposition. Thin films of La-Ca-Mn-O, [18][19][20][21] La-Ba-Mn-O, 22 La-(Ca,Pb)-Mn-O, 23 La-Ce-Mn-O, 24 and La-Sr-Mn-O 25 exhibit magnetoresistance in the range of 5%-150%, which is comparable to that obtained in giant magnetoresistance (GMR) metal multilayers. Jin et al and McCormack et al reported 26,27 a "colossal" magnetoresistance of more than 100 000% for epitaxial La-Ca-Mn-O films on LaAlO 3 .…”

Section: Introductionsupporting

confidence: 53%

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Debnath

Kim

Heo

et al. 2013

Journal of Applied Physics

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Dou, S. X. (2013). Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film. Journal of Applied Physics, 113 (6), 063508-1-063508-6. Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film Abstract An epitaxial La0.8Ca0.2MnO3/LaAlO 3 (LCMO/LAO) thin film was fabricated using the pulsed laser deposition technique to evaluate the correlation between the crystal structure and the magnetocaloric effect. In our study, the LCMO film was 200 nm in thickness and appeared to have a strong out-of plane texture. We found that each column in the LCMO thin film layer is a domain which has a different ordering direction. These microscopic feature results in anisotropic properties of magnetization, entropy, and relative cooling power. The film exhibited a paramagnetic-to-ferromagnetic second order phase transition at 249 K. The lack of any hysteresis loss also confirmed that the material is intrinsically reversible. In addition, the large magnetization of the thin film results in an entropy change larger than those of all other perovskite type materials. Consequently, the relative cooling power is significantly enhanced. An epitaxial La 0.8 Ca 0.2 MnO 3 /LaAlO 3 (LCMO/LAO) thin film was fabricated using the pulsed laser deposition technique to evaluate the correlation between the crystal structure and the magnetocaloric effect. In our study, the LCMO film was 200 nm in thickness and appeared to have a strong out-of plane texture. We found that each column in the LCMO thin film layer is a domain which has a different ordering direction. These microscopic feature results in anisotropic properties of magnetization, entropy, and relative cooling power. The film exhibited a paramagnetic-toferromagnetic second order phase transition at 249 K. The lack of any hysteresis loss also confirmed that the material is intrinsically reversible. In addition, the large magnetization of the thin film results in an entropy change larger than those of all other perovskite type materials. Consequently, the relative cooling power is significantly enhanced. V C 2013 American Institute of Physics. [http://dx

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Section: Introductionsupporting

confidence: 53%

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Debnath

Kim

Heo

et al. 2013

Journal of Applied Physics

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“…Ag composites Ag is not substituted into main LCMO lattice but remain rather as an additive in the system. (280 K) is comparable to aligned thin films [6,8,15] of LCMO, and to our knowledge is the best one yet obtained for any polycrystalline mangenites. As far fixed temperature and varying field MR is concerned its shape is changed from U type to V type.…”

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confidence: 54%

“…The former guarantees the above room temperature T MI and the later high MR. The highest TCR values yet obtained were around 20% for Ag implanted LCMO laser ablated thin films [6,8] and 50% for La 2/3 (Ca,Pb) 1/3 MnO 3 single crystals [9]. For polycrystalline LCMO or similar compounds the TCR values yet seen had always been below 10%.…”

Section: Introductionmentioning

confidence: 92%

“…In case of Ag = 0.2, 0.3 and 0.4 samples the transition is quite sharp and the obvious LCMO polycrystalline hump is not seen, further TCR is improved by nearly an order of magnitude. To our knowledge these are first LCMO:Ag polycrystalline compounds having very sharp T MI , which is generally the case for aligned LCMO films [6,8,15] or single crystals [9]. For large applications occasionally the bulk compounds in form of solid rods etc are required and hence the present LCMO:Ag composites will prove to be very useful in this direction.…”

Section: Introductionmentioning

confidence: 99%

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Magneto-transport of high TCR (temperature coefficient of resistance) La2/3Ca1/3MnO3 : Ag polycrystalline composites

Awana

Tripathi

Balamurugan

et al. 2006

Solid State Communications

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We report the synthesis, (micro)structural, magneto-transport and magnetization of polycrystalline La 2/3 Ca 1/3 MnO 3 :Ag x composites with x = 0.0, 0.1, 0.2, 0.3 and 0.4. The temperature coefficient of resistance (TCR) near ferromagnetic (FM) transition is increased significantly with addition of Ag. The FM transition temperature (T FM ) is also increased slightly with Ag addition. Magneto-transport measurements revealed that magneto-resistance MR is found to be maximum near T FM . Further the increased MR of up to 60% is seen above 300 K for higher silver added samples in an applied field of 7 Tesla. Sharp TCR is seen near T FM with highest value of up to 15 % for Ag (0.4) sample, which is an order of magnitude higher than as for present pristine sample and best value yet reported for any polycrystalline LCMO compound. Increased TCR, T FM and significant above room temperature MR of La 2/3 Ca 1/3 MnO 3 :Ag x composites is explained on the basis of improved grains size and connectivity with silver addition in the matrix. Better coupled FM domains and nearly conducting grain boundaries give rise to improved physical properties of the La 2/3 Ca 1/3 MnO 3 manganites. Ag composites Ag is not substituted into main LCMO lattice but remain rather as an additive in the system. (280 K) is comparable to aligned thin films [6,8,15] of LCMO, and to our knowledge is the best one yet obtained for any polycrystalline mangenites. As far fixed temperature and varying field MR is concerned its shape is changed from U type to V type. And is maximum at all fields up to 7 Tesla at 300 K. Infact with an increase in Ag content the low T below 300K MR% decrease and the room temperature 300 K increase. For LCMO: Ag (0.4) sample the MR of up to 60% is observed in 7 Tesla field at 300 K. Even at low fields of say 1 Tesla the MR of up to 16% is seen.The results of magnetization and magneto transport of LCMO:Ag x composites can be summarized as follows: 7 1. Ag does not substitute into host LCMO matrix in our polycrystalline LCMO:Ag x composites but improved significantly the grain morphology of the host.2. The T MI and T c remain nearly invariant with increase in x (Ag content).3. The sharpness of insulator-metal transition increases dramatically with increase in x (Ag content) and high (15%) sharp TCR is observed for Ag composites 4. Though the MR is seen in all the samples right from 300 K down to 5 K, the same is negligible at 300 K and more at lower T for pure sample and is maximum at 300 K and least at 5 K for Ag (0.4) containing compounds. DISCUSSIONNow we try to explain in broad sense the main results summarized above, as far as (1) is concerned there are some very recent reports in literature, which deals with the LCMO and LCMO/ZrO 2 [20]. In all these composites the quality of the LCMO was deteriorated. In case of LCMO:Ag there is a good probability of Ag being distributed at grain boundaries and hence providing better connectivity of grains, which is seen in Fig. 2(b). In most of other composites [16][17][18][19][20] the addi...

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“…3 devices using not only manganite films [13][14][15] but also High Tc (HTc) superconductors [16,17]. In this context, understanding the influence of point defects on the physical properties of manganite films has regain importance.…”

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confidence: 99%

Influence of ion implantation on the magnetic and transport properties of manganite films

et al. 2010

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We have used oxygen ions irradiation to generate controlled structural disorder in thin manganite films. Conductive atomic force microscopy CAFM), transport and magnetic measurements were performed to analyze the influence of the implantation process in the physical properties of the films. CAFM images show regions with different conductivity values, probably due to the random distribution of point defect or inhomogeneous changes of the local Mn3+/4+ ratio to reduce lattice strains of the irradiated areas. The transport and magnetic properties of these systems are interpreted in this context. Metal-insulator transition can be described in the frame of a percolative model. Disorder increases the distance between conducting regions, lowering the observed T MI . Point defect disorder increases localization of the carriers due to increased disorder and locally enhanced strain field. Remarkably, even with the inhomogeneous nature of the samples, no sign of low field magnetoresistance was found.Point defect disorder decreases the system magnetization but doesn't seem to change the magnetic transition temperature. As a consequence, an important decoupling between the 2 magnetic and the metal-insulator transition is found for ion irradiated films as opposed to the classical double exchange model scenario.Pacs: 71.30.+h, 75.47.Lx

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Silver ion implantation in epitaxial La2/3Ca1/3MnO3 thin films: Large temperature coefficient of resistance for bolometric applications

Cited by 51 publications

References 20 publications

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Correlation between structural parameters and the magnetocaloric effect in epitaxial La0.8Ca0.2MnO3/LaAlO3 thin film

Magneto-transport of high TCR (temperature coefficient of resistance) La2/3Ca1/3MnO3 : Ag polycrystalline composites

Influence of ion implantation on the magnetic and transport properties of manganite films

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