Temperature dependence of the damping constant and the order parameter close to the lambda phase transitions in ammonium halides

Yurtseven H; Karacali H

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Temperature dependence of the damping constant and the order parameter close to the lambda phase transitions in ammonium halides

机译：卤化铵中阻尼常数和阶跃参数接近λ相变的温度依赖性

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This study gives our calculation for the damping constant, using the expressions derived for an Ising pseudospin-phonon coupled system in the ammonium halides (NH4Cl and NH4Br). For this calculation of the damping constant, we use the temperature dependence of the order parameter calculated from the molecular field theory. We predict here the damping constants for the v(5) (174 cm(-1)) and v(5) (177 cm(-1)) Raman modes of NH4Cl and NH4Br, respectively, below T-lambda and compare them with our observed bandwidths measured as a function of temperature for those phonon modes at zero pressure.

机译：这项研究使用卤化铵（NH4Cl和NH4Br）中伊辛伪自旋声子耦合系统的推导表达式给出了阻尼常数的计算。对于阻尼常数的计算，我们使用从分子场理论计算得出的阶跃参数的温度依赖性。我们在此处预测T-λ以下的NH4Cl和NH4Br的v（5）（174 cm（-1））和v（5）（177 cm（-1））拉曼模态的阻尼常数，并将其与对于零压力下的那些声子模式，我们观察到的带宽是温度的函数。

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《Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy》 |2006年第2期|共7页
作者
Yurtseven H; Karacali H;
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正文语种 eng
中图分类分析化学;
关键词
damping constant; Raman bandwidths; ammonium halides; T-lambda; RAMAN-SCATTERING; OPTICAL PHONONS; T-LAMBDA; FREQUENCY; CRYSTALS; VIBRATIONS; DISORDER; SULFATE; SPECTRA;

机译：阻尼常数;拉曼带宽;卤化铵;T-λ;拉曼散射;光子;T-λ;频率;晶体;振动;乱序;硫酸盐;光谱;

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1. Temperature dependence of the damping constant and the order parameter close to the lambda phase transitions in ammonium halides [J] . Yurtseven H, Karacali H Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy . 2006,第2期

机译：卤化铵中阻尼常数和阶跃参数接近λ相变的温度依赖性
2. A Raman study of temperature dependence of phonons near the #lambda# -phase transitions in ammonium halides [J] . H. Yurtseven, W. F. Sherman ARI: Bulletin of the Technical University of Istanbul: An interdisciplinary journal of physical and engineering sciences . 1999,第1期

机译：拉曼研究卤化铵中＃lambda＃相变附近声子的温度依赖性
3. Temperature dependence of the Raman frequencies and bandwidths close to phase transitions in ammonium halides [J] . Yurtseven H. Journal of Molecular Structure . 2001,第1a3期

机译：拉曼频率和带宽的温度依赖性接近卤化铵的相变
4. Temperature dependence of Gilbert damping constant in amorphous Co-Fe-B thin films [C] . T. V. A. Nguyen, H. Sato, S. Ikeda, 応用物理学会秋季学術講演会;応用物理学会 . -1

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5. The heat capacity of superfluid helium-4 in the presence of a constant heat flux near the lambda transition temperature [D] . Harter, Alexa Welsh 2001

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7. Shift of close-packed basal planes as an order parameter of transitions between antiferromangetic phases in solid oxygen: II. Temperature/pressure dependence of sound velocities and lattice parameters [O] . Gomonay E.V., Loktev V.M. 2007

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Temperature dependence of the damping constant and the order parameter close to the lambda phase transitions in ammonium halides

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