ACOUSTIC PROPERTIES OF Nd2CuO4 AT LOW TEMPERATURES

1991 ◽  
Vol 05 (20) ◽  
pp. 1367-1375 ◽  
Author(s):  
V. D. FIL ◽  
G. A. ZVYAGINA ◽  
S. V. ZHERLITSYN ◽  
I. M. VITEBSKY ◽  
V. L. SOBOLEV ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Low Temperatures ◽  
Acoustic Properties ◽  
Continuous Spin ◽  
Magnetic Subsystem ◽  
Magnetoelastic Coupling ◽  
Ferroelastic Phase Transition

Acoustic properties anomalies near the points of phase transition in the magnetic subsystem of Nd 2 CuO 4 have been studied. A spontaneous ferroelastic phase transition at T = 5 K and magnetic field induced ferroelastic phase transition (PT) associated with continuous spin reorientations at T < 0.5 K have been found. The exchange nature of magnetoelastic coupling is suggested.

Spin-reorientation phase transition inNd2CuO4in an external magnetic field: Unusual manifestations of magnetoelastic coupling

1993 ◽  
Vol 48 (5) ◽  
pp. 3417-3422 ◽  
Author(s):  
V. L. Sobolev ◽  
H. L. Huang ◽  
I. M. Vitebskii ◽  
A. N. Knigavko ◽  
Yu. G. Pashkevich
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
External Magnetic Field ◽  
Spin Reorientation ◽  
Magnetoelastic Coupling

scholarly journals Metamagnetism in manganate magnesium ferrite

2019 ◽  
Vol 70 (1) ◽  
pp. 78-81
Author(s):  
Jozef Sláma ◽  
Jozef Pal’a ◽  
Martin Šoka ◽  
Jan Lokaj
Keyword(s):  
Magnetic Field ◽  
Phase Transition ◽  
Low Temperatures ◽  
Unit Cell Volume ◽  
Magnetic Phase ◽  
Critical Transition ◽  
Magnesium Ferrite ◽  
Spin Ordering ◽  
Transition Field ◽  
Manganese Magnesium

Abstract The metamagnetic properties of the manganese magnesium ferrites having the general formula Mn0.7Mg0.3Fe2O4 prepared by the standard ceramic technique have been studied. It is proposed that when a change of temperature at adequate magnetic field is applied in a Mn0.7Mg0.3Fe2O4 a magnetic phase transition will be generated, giving rise to an antiferromagnetic (AFM) state from ferrimagnetic (FM) phase. The critical transition field Hac = 300 A/m was estimated for critical magnetization curve of transition from the metamagnetic behavior to FM behavior of sample. The FM to AFM transition in these ferrites is accompanied by a Néel type to Yafet-Kittel type transition and gradual spin ordering changes of the unit cell volume. The application of an external magnetic field to the low-temperatures AFM state causes the sample to reset to the original FM state.

MAGNETIC FIELD DEPENDENT RELAXATION TIME IN p-InSb AT LOW TEMPERATURES

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-689-C5-693
Author(s):  
J. D.N. Cheeke ◽  
G. Madore ◽  
A. Hikata
Keyword(s):  
Magnetic Field ◽  
Relaxation Time ◽  
Low Temperatures ◽  
Field Dependent

Simple Systems

2017 ◽  
Author(s):  
Jochen Rau
Keyword(s):  
Magnetic Field ◽  
Low Temperatures ◽  
General Framework ◽  
Gibbs State ◽  
Macroscopic System ◽  
Basic Model ◽  
System A ◽  
Paramagnetic Salt ◽  
High And Low Temperatures ◽  
Simple Systems

Even though the general framework of statistical mechanics is ultimately targeted at the description of macroscopic systems, it is illustrative to apply it first to some simple systems: a harmonic oscillator, a rotor, and a spin in a magnetic field. These applications serve to illustrate how a key function associated with the Gibbs state, the so-called partition function, is calculated in practice, how the entropy function is obtained via a Legendre transformation, and how such systems behave in the limits of high and low temperatures. After discussing these simple systems, this chapter considers a first example where multiple constituents are assembled into a macroscopic system: a basic model of a paramagnetic salt. It also investigates the size of energy fluctuations and how—in the case of the paramagnet—these fluctuations scale with the number of constituents.

Ferroelastic phase transition in univalent mercury halides in vicinity of tricritical point

1992 ◽  
Vol 130 (1) ◽  
pp. 263-283 ◽  
Author(s):  
M. E. Boiko ◽  
Yu. Markov ◽  
V. S. Vikhnin ◽  
A. S. Yurkov ◽  
B. S. Zadokhin
Keyword(s):  
Phase Transition ◽  
Tricritical Point ◽  
Ferroelastic Phase Transition ◽  
Mercury Halides
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