Temperature dependence of spin reversal in orderedNi3Mn: Evidence for anomalous behavior

1994 ◽  
Vol 49 (6) ◽  
pp. 4307-4310 ◽  
Author(s):  
G. Mazzone ◽  
C. Petrillo ◽  
F. Sacchetti
Keyword(s):  
Temperature Dependence ◽  
Anomalous Behavior ◽  
Spin Reversal

scholarly journals Giant temperature dependence of the spin reversal field in magnetoelectric chromia

2014 ◽  
Vol 104 (2) ◽  
pp. 022403 ◽  
Author(s):  
Lorenzo Fallarino ◽  
Andreas Berger ◽  
Christian Binek
Keyword(s):  
Temperature Dependence ◽  
Spin Reversal ◽  
Reversal Field

Nonmonotonous Behavior of Temperature-Dependence of Plasma Frequency and Effect of a Local Instability of the PbTe:In,Ga Lattice

1997 ◽  
Vol 484 ◽  
Author(s):  
A. I. Belogorokihov ◽  
L. I. Belogorokhova ◽  
D. R. Khokhlov
Keyword(s):  
Temperature Dependence ◽  
Plasma Frequency ◽  
Lattice Structure ◽  
Lead Telluride ◽  
Far Infrared ◽  
Infrared Region ◽  
Anomalous Behavior ◽  
Local Instability ◽  
Impurity Centers ◽  
First Time

AbstractThe optical spectra of PbTe:In,Ga samples were studied in the Far Infrared region at temperatures T=11 K–3 50K. Anomalous behavior of the temperature dependence of the plasma frequency at 65K–80K was observed for the first time. This is explained by means of a model of localized changes in the lead telluride lattice structure near impurity centers.

MICROWAVE ABSORPTION STUDIES ON HIGH-Tc SUPERCONDUCTORS AND RELATED MATERIALS V-ANOMALOUS BEHAVIOR OF LOW MAGNETIC FIELD MICROWAVE ABSORPTION IN AN ULTRA-THIN Bi-Sr-Ca-Cu-O FILM

1991 ◽  
Vol 05 (30) ◽  
pp. 1981-1987 ◽  
Author(s):  
K. SUGAWARA ◽  
T. SUGIMOTO ◽  
D.J. BAAR ◽  
Y. SHIOHARA ◽  
S. TANAKA
Keyword(s):  
Magnetic Field ◽  
Temperature Dependence ◽  
Microwave Absorption ◽  
Anomalous Behavior ◽  
High Tc Superconductors ◽  
High Tc ◽  
Absorption Studies ◽  
Signal Changes ◽  
Low Magnetic Field ◽  
Mgo Substrate

Non-resonant microwave absorption (NRMA) studies have been done on a 100 Å thick Bi-Sr-Ca-Cu-O film fabricated on MgO substrate by MOCVD. Temperature dependence of NRMA intensity reveals that the intensity becomes maximum at around 30 K, 40 K and 55 K, and minimum at around 35 K and 50 K. The sign (or phase) of the signal changes by passing through these intensity minimum temperatures. Furthermore, the linewidths of the NRMA signals anomalously increase in the vicinity of these temperatures.

Anomalous behavior of temperature dependence of magnetostriction in NdFe11Ti

2004 ◽  
Vol 272-276 ◽  
pp. 2093-2095 ◽  
Author(s):  
N. Tajabor ◽  
A. Amirabadizadeh ◽  
M.R. Alinejad ◽  
H. Salamati ◽  
F. Pouraian
Keyword(s):  
Temperature Dependence ◽  
Anomalous Behavior

Raman Investigation of the Layered Manganese Perovskite La1.2Sr1.8Mn2O7

1997 ◽  
Vol 494 ◽  
Author(s):  
D. B. Romero ◽  
V. B. Podobedov ◽  
A. Weber ◽  
J. P. Rice ◽  
J. F. Mitchell ◽  
...  
Keyword(s):  
Critical Temperature ◽  
Raman Scattering ◽  
Temperature Dependence ◽  
Raman Spectra ◽  
Anomalous Behavior ◽  
Spectral Features ◽  
Long Wavelength ◽  
Manganese Perovskite

ABSTRACTWe report the results of a detailed polarization and temperature dependence study of the Raman scattering from La1.2Sr1.8Mn2O7. The Raman spectra reveal three general spectral features. First, there are sharp peaks due to long-wavelength optic phonons. Phonons, attributed to the distortion of the MnO6 octahedra, reveal an anomalous behavior which correlates with the transition from a paramagnetic-insulating (PI) to a ferromagnetic-metallic (FM) phase at a critical temperature Tc. Second, there is an electronic continuum that is suppressed for ω < 500 cm−1 at T ≪ Tc. Third, broad peaks between 400 cm1 to 800 cm−1 seen in the PI state, surprisingly, disappear in the FM state. The implications of these results are discussed.

Crystallization and Raman Spectra of Langasite-Type Na2CaGe6O14, Na2SrGe6O14 and Pb3Ga2Ge4O14 in Corresponding Glasses

2009 ◽  
Vol 421-422 ◽  
pp. 213-216
Author(s):  
Yoshihiro Takahashi ◽  
Takumi Fujiwara ◽  
Yasuhiko Benino ◽  
Takayuki Komatsu
Keyword(s):  
Phase Transition ◽  
Heat Treatment ◽  
Raman Spectroscopy ◽  
Structural Change ◽  
Temperature Dependence ◽  
Crystallization Behavior ◽  
Second Harmonic ◽  
Structural Similarity ◽  
Anomalous Behavior ◽  
Medium Range

We investigated the crystallization behavior of langasite-type phases in the stoichiometric corresponding glasses, i.e., Na2CaGe6O14, Na2SrGe6O14 and Pb3Ga2Ge4O14. The langasite-type phases singly were formed by heat-treatment in the glasses. Raman spectroscopy revealed the structural similarity on the scale of short-/medium-range order between the langasite-type phases and the corresponding glasses. Furthermore, we also examined the temperature dependence of second-harmonic (SH) intensity of the langasite-type phases. The SH-temperature curves exhibited an anomalous behavior, implying a structural change, e.g., isomorphous phase transition.

Temperature Dependence of Electron Mobility in Doped n-Ge

1998 ◽  
Vol 12 (27) ◽  
pp. 1147-1151
Author(s):  
I. Jakeli ◽  
N. Kekelidze ◽  
I. Ambokadze ◽  
N. Shamugia ◽  
S. Baskoutas ◽  
...  
Keyword(s):  
Theoretical Model ◽  
Temperature Dependence ◽  
Electron Mobility ◽  
Phonon Scattering ◽  
Anomalous Behavior ◽  
The Other ◽  
Donor And Acceptor ◽  
Two Samples

In this work we point out experimentally the anomalous behavior of the total mobility as a function of temperature for a specified doped n-Ge sample. Three perfect Ge crystals were grown, with As and Ga as donor and acceptor impurities, with suitable concentrations in one of the crystals, in order to satisfy the condition which is imposed by a theoretical model e.g. 5×10-2<NA/ND<0:33 and ND+NA>8×1013 cm-3. Therefore for this specified crystal the mobility reaches at T=9 K a maximum, at T=23 K it reaches a minimum, at T 25 K it increases according to T-3/2 law, and then decreases monotonously according to T-3/2 law due to the phonon scattering. In contrast in the other two samples, the mobilities rst increase monotonously and then at 18 K and at 26 K decrease monotonously due to the T-3/2 law.

Ultrasonic absorption in the water–2-isobutoxyethanol system

1970 ◽  
Vol 48 (13) ◽  
pp. 2052-2060 ◽  
Author(s):  
R. J. Fanning ◽  
P. Kruus
Keyword(s):  
Temperature Dependence ◽  
Anomalous Behavior ◽  
Ultrasonic Absorption ◽  
Small Temperature ◽  
Binary Liquid ◽  
Alcohol Water ◽  
Liquid Systems ◽  
System 2 ◽  
Type Of Behavior ◽  
Absorption Measurements

Ultrasonic absorption measurements have been carried out on the system 2-isobutoxyethanol–water as a function of composition, temperature, and frequency. The composition and frequency dependence of the absorption show the same general type of behavior as for previously investigated critical binary liquid systems and for alcohol–water systems. The temperature dependence shows a behavior opposite to that for the other systems at the frequency where it was studied in detail. At the lowest experimentally available frequency, however, the temperature dependence is somewhat similar to that in other critical binary liquid systems. Ultrasonic absorption measurements are also reported for water at small temperature intervals. No anomalous behavior in the temperature range 0 to 30 °C is observed.

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