Effect of Li doping on the magnetotransport properties of La[sub 0.7]Ca[sub 0.3-y]Li[sub y]MnO[sub 3] system: Decrease of metal–insulator transition temperature

Bhattacharya, Sayani; Mukherjee, R. K.; Chaudhuri, B. K.; Yang, H. D.
June 2003
Applied Physics Letters;6/9/2003, Vol. 82 Issue 23, p4101
Academic Journal
With increasing the Li doping level in La[SUB0.7]Ca[SUB0.3-y]Li[SUBy]MnO[SUB3] (0⩽y⩽0.3), the system is driven from a higher-conductivity regime to a lower-conductivity regime, which is in sharp contrast with the behavior of Na or K doping. Compared to those of K or Na, the ionic radius of Li is much smaller than that of Ca. Therefore, substitution of Ca by Li results in a smaller average A-site radius, narrowing the bandwidth and hence enhancing the band gap and resistivity. The effect of random disorder of La[SUP3+] and A[SUP2+] also plays an important role leading to charge localization.


Related Articles

  • Integrated-optical add/drop multiplexer for DWDM in lithium niobate. Runde, D.; Brunken, S.; Breuer, S.; Kip, D. // Applied Physics B: Lasers & Optics;Jun2007, Vol. 88 Issue 1, p83 

    In this contribution, an add/drop multiplexer that uses a mode-selective coupler and a holographically recorded slanted Bragg grating in lithium niobate is demonstrated. A Bragg grating with a bandwidth of 0.1 nm allows for an add/drop efficiency of about 96% with a cross-talk well above 22 dB...

  • Efficient single-photon counting at 1.55 μm by intracavity frequency upconversion in a unidirectional ring laser. Haifeng Pan; Huafang Dong; Heping Zeng; Wei Lu // Applied Physics Letters;11/6/2006, Vol. 89 Issue 19, p191108 

    A single-photon signal at 1.55 μm was converted to its visible replica by sum-frequency mixing with a strong intracavity pump of a unidirectional ring laser at 1.06 μm in a periodically poled lithium niobate (PPLN) crystal. In the ring laser configuration, standing-wave photorefractive...

  • Tunable acoustic resonator on a photoinduced grating in lithium niobate. Batanova, N. L.; Golenishchev-Kutuzov, A. V.; Golenishchev-Kutuzov, V. A.; Kalimullin, R. I.; Usachev, A. E. // Technical Physics Letters;Feb2009, Vol. 35 Issue 2, p151 

    It is experimentally demonstrated that photoinduced gratings in lithium niobate single crystals can be used as tunable high-frequency resonators for the surface and bulk acoustic waves. The resonance frequency can be tuned within broad limits by rewriting gratings with interfering laser beams.

  • Fabrication and characterization of periodically poled lithium niobate waveguide using femtosecond laser pulses. Shuanggen Zhang; Jianghong Yao; Qing Shi; Yange Liu; Weiwei Liu; Zhangchao Huang; Fuyun Lu; Enbang Li // Applied Physics Letters;6/9/2008, Vol. 92 Issue 23, p231106 

    We present in this letter the fabrication and characterization of thermally stable type II waveguides in Z-cut periodically poled lithium niobate crystals. The waveguides were fabricated by using a femtosecond laser and were utilized for second harmonic generation. Our experiments have shown...

  • Flexible all-optical wavelength conversions of 1.57-ps pulses exploiting cascaded sum- and difference frequency generation (cSFG/DFG) in a PPLN waveguide. Wang, J.; Sun, J.; Luo, C.; Sun, Q. // Applied Physics B: Lasers & Optics;Jun2006, Vol. 83 Issue 4, p543 

    Flexible all-optical wavelength conversions of ps-pulses based on cascaded sum- and difference frequency generation (cSFG/DFG) are proposed and experimentally demonstrated using a periodically poled lithium niobate (PPLN) waveguide. The pulsed signal, with a 40 GHz repetition rate and a 1.57 ps...

  • Optimization Design Parameters of Electro-optic Modulators for Low Loss Wide Bandwidth Capability of Optical Communication Systems. Rashed, Ahmed Nabih Zaki // International Journal of Computer Network & Information Security;Jun2012, Vol. 4 Issue 5, p46 

    The effects of temperature, and operating signal wavelength on high frequency radio frequency transmission characteristics are deeply investigated against various materials based electro optic modulator devices such as lithium Niobate (LiNbO3), polymer, and semiconductor materials. On the other...

  • Broadband difference frequency generation around phase-match singularity. Tsutomu Yanagawa; Hirohisa Kanbara; Osamu Tadanaga; Masaki Asobe; Hiroyuki Suzuki; Junji Yumoto // Applied Physics Letters;4/18/2005, Vol. 86 Issue 16, p161106 

    It is shown that a wide tunability range of greater than 500 nm can be obtained in the 2 μm band in an 18 mm long periodically poled lithium niobate chip with a single quasiphase-matching grating period at a constant temperature. This letter demonstrates the difference frequency generation...

  • Broadband photon pair generation at 3 ω/2. Suchowski, Haim; Bruner, Barry; Israel, Yonatan; Ganany-Padowicz, Ayelet; Arie, Ady; Silberberg, Yaron // Applied Physics B: Lasers & Optics;Feb2016, Vol. 122 Issue 2, p1 

    We experimentally demonstrate a method for creating broad bandwidth photon pairs in the visible spectral region, centered at a frequency that is higher than that of the initial pump source. Spontaneous down conversion of a narrowband 1053 nm pulsed Nd:YLF laser is followed by highly efficient...

  • Lattice site location studies of ion implanted 8Li in GaN. Dalmer, M.; Restle, M. // Journal of Applied Physics;9/15/1998, Vol. 84 Issue 6, p3085 

    Cites a study which investigated the lattice sites of ion implanted lithium (Li) atoms in GaN. Information on ion implantation; Details on the GaN films used in the experiment; Results of the experiment.


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics