6533b86dfe1ef96bd12c9355

RESEARCH PRODUCT

Quantum dots of Cd0.5Mn0.5Te semimagnetic semiconductor formed by the cold isostatic pressure method

Etienne SnoeckO. ContrerasO. ContrerasManuel MorocoimaJ. GonzálezJ. M. BrotoE. QuinteroV. Muñoz-san JoséMiguel QuinteroRafael TovarCh. Power

subject

Phase transitionMaterials scienceCondensed matter physicsbusiness.industryCondensed Matter PhysicsElectronic Optical and Magnetic MaterialsSpin magnetic momentMagnetizationSemiconductorElectron diffractionQuantum dotPhase (matter)Crystallitebusiness

description

Abstract Cd0.5Mn0.5Te is a semimagnetic semiconductor, which crystallizes in the zinc-blende structure (ZB) and exhibits a magnetic spin glass like transition at 21 K. Under pressure it shows a first-order phase transition around 2.6 GPa to the NaCl like structure. In this work, the pressure cycled method using a Paris–Edinburgh cell up to 8 GPa has been applied to Cd0.5Mn0.5Te samples in order to obtain recovered nanocrystals. The nanoparticles have been characterized by EDX and electron microscopy. The X-ray and electron diffraction results confirmed the existence of nanocrystals in the ZB phase with an average size of 7 nm. Magnetization measurements made in the range of 2–300 K at low field show that the temperature of the magnetic transition decreases when the crystallites’ size is reduced.

https://doi.org/10.1016/j.jmmm.2005.03.058