Ce doping influence on the magnetic phase transition in In2S3:Ce nanoparticles

CrystEngComm ◽  
2014 ◽  
Vol 16 (13) ◽  
pp. 2584-2588 ◽  
Author(s):  
Binbin Yao ◽  
Pan Wang ◽  
Shuangming Wang ◽  
Mingzhe Zhang
Keyword(s):  
Phase Transition ◽  
Quantum Phase Transition ◽  
Magnetic Phase Transition ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Magnetic Phase ◽  
Long Range Order ◽  
Thermally Driven ◽  
Diluted Magnetic ◽  
Superparamagnetic State

The classical thermally driven transition from supermagnetic to blocked supermagnetic and quantum phase transition from magnetic long-range order to quantum superparamagnetic state have been observed in ultrasmall In2S3:Ce diluted magnetic semiconductors.

Switching in Magnetite: A Thermally Driven Magnetic Phase Transition

1969 ◽  
Vol 23 (25) ◽  
pp. 1444-1447 ◽  
Author(s):  
T. Burch ◽  
P. P. Craig ◽  
C. Hedrick ◽  
T. A. Kitchens ◽  
J. I. Budnick ◽  
...  
Keyword(s):  
Phase Transition ◽  
Magnetic Phase Transition ◽  
Magnetic Phase ◽  
Thermally Driven

scholarly journals Molecular-Field Approximation in the Theory of Ferromagnetic Phase Transition in Diluted Magnetic Semiconductors

2021 ◽  
Vol 66 (6) ◽  
pp. 503
Author(s):  
Yu.G. Semenov ◽  
S.M. Ryabchenko
Keyword(s):  
Phase Transition ◽  
Spin Polarization ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Field Approximation ◽  
Ferromagnetic Phase ◽  
Spin Interaction ◽  
Free Carriers ◽  
Ferromagnetic Phase Transition ◽  
Diluted Magnetic

In this pedagogical paper, the comparative analysis of two common approaches describing the ferromagnetic phase transition in diluted magnetic semiconductors (DMS) is expounded in terms of the Weiss field approximation. Assuming a finite spin polarization of the magnetic ions, the treatment of carrier-ion exchange interaction in the first order evokes a homogeneous Weiss molecular field that polarizes the spins of free carriers. In turn, this spin polarization of the free carriers exerts the effective field that may stabilize the DMS spin polarization belowa critical temperature TC. The treatment of such self-consistent spontaneous DMS magnetization can be done in terms of the spin-spin interaction independent of the inter-ion distance and the infinitesimal in thermodynamic limit. On the other hand, by additionally accounting for the second-order effects of the carrier-ion exchange interaction, we can treat a Weiss field in terms of the Ruderman–Kittel–Kasuya–Yosida indirect spin-spin interaction, which oscillates and does not disappear at finite inter-ion distances in the case of a finite concentration of carriers. These both approaches result in the same Curie temperature TC provided a non-correlated homogeneous random distribution of the localized spin moments over the sample volume. We discuss the origin of such coincidence and show when this is not a case in other more realistic models of the conducting DMSs.

HIGH-PRESSURE INDUCED STRUCTURAL PHASE TRANSITION AND ELASTIC PROPERTIES OF DILUTED MAGNETIC SEMICONDUCTORS Zn1-xMnxSe

2008 ◽  
Vol 22 (17) ◽  
pp. 2749-2767 ◽  
Author(s):  
DINESH VARSHNEY ◽  
V. RATHORE ◽  
N. KAURAV ◽  
R. K. SINGH
Keyword(s):  
Phase Transition ◽  
Structural Phase Transition ◽  
Rock Salt ◽  
Elastic Constants ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Structural Phase ◽  
Zinc Blende ◽  
Diluted Magnetic ◽  
Vdw Interaction

An effective interionic interaction potential is developed to study the pressure-induced phase transitions from zinc blende (B3) to rock salt (B1) structure in diluted magnetic semiconductors Zn 1-x Mn x Se (x=0.08 and 0.15). As a first step, the elastic constants, including the long-range Coulomb, van der Waals (vdW) interaction and the short-range repulsive interaction up to second-neighbor ions within the Hafemeister and Flygare approach, are derived. Assuming that both the ions are polarizable, the Slater–Kirkwood variational method is employed to estimate the vdW coefficients. The estimated values of the phase transition pressure (Pt) increase with Mn concentration. The vast volume discontinuity in the pressure volume phase diagram identifies the structural phase transition from zinc blende to rock salt structure. The variation of second-order elastic constants with pressure resembles that observed in some binary semiconductors. It is noticed that the vdW interaction is effective in obtaining the thermodynamical parameters such as Debye temperature, Gruneisen parameter, and thermal expansion coefficient. However, the inconsistency in the value of pressure derivative of the theoretical and experimental value of C44 is attributed to the fact that we have derived the expressions by assuming that the overlap repulsion is significant only up to nearest neighbors, as well as neglecting thermal effects.

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