Role of magnetocrystalline anisotropy on anisotropic magnetocaloric effect in single crystals

AbstractWe report the magneto-conductivity analysis of Bi2Se3 single crystal at different temperatures in a magnetic field range of ± 14 T. The single crystals are grown by the self-flux method and characterized through X-ray diffraction, Scanning Electron Microscopy, and Raman Spectroscopy. The single crystals show magnetoresistance (MR%) of around 380% at a magnetic field of 14 T and a temperature of 5 K. The Hikami–Larkin–Nagaoka (HLN) equation has been used to fit the magneto-conductivity (MC) data. However, the HLN fitted curve deviates at higher magnetic fields above 1 T, suggesting that the role of surface-driven conductivity suppresses with an increasing magnetic field. This article proposes a speculative model comprising of surface-driven HLN and added quantum diffusive and bulk carriers-driven classical terms. The model successfully explains the MC of the Bi2Se3 single crystal at various temperatures (5–200 K) and applied magnetic fields (up to 14 T).

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Internal melt figures in ice by rapid adiabatic compression

Journal of Glaciology ◽

10.3189/s0022143000003890 ◽

1994 ◽

Vol 40 (134) ◽

pp. 132-134

Author(s):

R.E. Gagnon ◽

C. Tulk ◽

H. Kiefte

Keyword(s):

Phase Transformations ◽

Grain Boundaries ◽

Single Crystals ◽

Adiabatic Compression ◽

Air Bubbles ◽

Water Ice ◽

Deep Focus ◽

And Behavior ◽

First Time

AbstractSingle crystals and bicrystals of water ice have been adiabatically pressurized to produce, and clearly illustrate, two types of internal melt figures: (1) dendritic figures that grow from nucleation imperfections on the specimen’s surface, or from air bubbles at grain boundaries, into the ice as pressure is elevated; and (2) compression melt fractures, flat liquid-filled disks, that nucleate at imperfections in the crystal and grow with the application of pressure eventually to sprout dendritic fingers at the periphery. The transparency of the ice permitted visualization of the growth and behavior of the figures, and this could be an important tool in understanding the role of phase transformations in deep-focus earthquakes. Correlation between figure size and pressure is noted for the first time.

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Spin-Lattice Coupling and Peculiarities of Magnetic Behavior of Ferrimagnetic Ludwigites Mn0.52+M1.52+Mn3+BO5(M=Cu, Ni)

Solid State Phenomena ◽

10.4028/www.scientific.net/ssp.233-234.133 ◽

2015 ◽

Vol 233-234 ◽

pp. 133-136 ◽

Cited By ~ 10

Author(s):

Leonard Bezmaternykh ◽

Evgeniya Moshkina ◽

Evgeniy Eremin ◽

Maxim Molokeev ◽

Nikita Volkov ◽

...

Keyword(s):

Temperature Field ◽

Low Temperature ◽

Magnetic Anisotropy ◽

Single Crystals ◽

Magnetic Behavior ◽

Temperature Hysteresis ◽

Spin Lattice ◽

Field Magnetization ◽

Lattice Coupling

Temperature-field and orientational magnetization dependences of single crystals were measured. Both samples demonstrate significant field-depending temperature hysteresis and low-temperature counter field magnetization. The correlation of orientational dependences of these effects and magnetic anisotropy is analyzed; the role of spin-lattice interactions is discussed.

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