Anisotropic transport properties of charge-ordered La _{5/8− y} Pr _y Ca _3/8 MnO ₃ ( y = 0.43) film

Abstract

The anisotropic resistances along [001] and [1][2][3][4][5][6][7][8][9][10] axes are investigated for an La 5/8−y Pr y Ca 3/8 MnO 3 (y = 0.43) (LPCMO) film grown on (110)-oriented LaAlO 3 substrate. It is found that the charge order (CO) transition is much stronger and the resistance is larger along the [001] direction than that along the [1-10] direction. Special attention has been paid to the different effects of a magnetic field on the resistances of the two axes. The resistance is more susceptible to the magnetic field along the [001] direction compared with that along the [1-10] direction. Our results demonstrate that the anisotropic transport properties can be ascribed to the intrinsic anisotropic strain field in the film, which changes the shape of metallic domains for the phase separation manganite film. We also provide a feasible method to rule out the Joule heat effect from the electric current effect. This could be useful for future construction and application of materials and devices.

Thermal analysis and CW laser operation at 1.998 µm in end pumped Tm:YAP lasers

“…Furthermore, upconversion process that promoted Tm ions to 1 G4 level generates significant heat dissipation [16] in the Tm: YAP rod, which is also ignored in equ. (2). The effect of undesired ESA1,2 increases strongly under non-lasing conditions, which means that a large deviation between the experimental data and numerical calculation is near the laser threshold.…”

“…Thulium doped yttrium-aluminum perovskite (Tm: YAP) has been utilized as a pulsed and continuous wave (CW) laser source in the 2 µm range, for various applications in medicine, atmospheric sounding and scientific research because of its ideal thermal-mechanical characteristics [1][2][3][4]. These characteristics represented in high mechanical strength and large heat conductivity of 0.11 W/cm•K [5], which allows high power operation with a reduced risk of fracture.…”