μSR-detected soft mode toward a possible phase transition in a disordered spin-gap system, (CH3)2CHNH3–Cu(ClxBr1−x)3

In this paper, we present the results of the temperature dependence studies of the photoinduced phonon mode which appears in a ferroelectric-semiconductor Sn2P2S6 (SPS) crystal under the influence of femtosecond laser pulses. We show that its behavior reminds the soft mode one near the phase transition. However, the observed decrease in the oscillation frequency in the vicinity of Curie temperature Tc is much weaker than previously reported. This can be explained by the shadowing of the pure soft mode by its interaction with other photoinduced modes.

Download Full-text

Effect of biasing field on the soft mode in the vicinity of the SmC*-SmA phase transition of a ferroelectric liquid crystal “ZLI4851.”

Journal of Applied Physics ◽

10.1063/1.1587871 ◽

2003 ◽

Vol 94 (4) ◽

pp. 2271-2276 ◽

Cited By ~ 14

Author(s):

S. K. Kundu ◽

K. Suzuki ◽

B. K. Chaudhuri

Keyword(s):

Phase Transition ◽

Liquid Crystal ◽

Soft Mode ◽

Ferroelectric Liquid Crystal

Download Full-text

Influence of Bi3+ ion displacement on the soft mode phase transition in Bi2Ti4O11

Physics Letters A ◽

10.1016/0375-9601(93)90835-n ◽

1993 ◽

Vol 175 (3-4) ◽

pp. 246-251 ◽

Cited By ~ 6

Author(s):

Guangtin Zou ◽

Jinfang Meng ◽

Qiliang Cui ◽

Yongnian Zhao ◽

Dongmei Li

Keyword(s):

Phase Transition ◽

Soft Mode

Download Full-text

Manifestation of magnetoelastic interactions in Raman spectra of HoxNd1−xFe3(BO3)4 crystals

Journal of Advanced Dielectrics ◽

10.1142/s2010135x1850011x ◽

2018 ◽

Vol 08 (02) ◽

pp. 1850011 ◽

Cited By ~ 7

Author(s):

A. S. Krylov ◽

S. N. Sofronova ◽

I. A. Gudim ◽

S. N. Krylova ◽

Rajesh Kumar ◽

...

Keyword(s):

Phase Transition ◽

Raman Spectra ◽

Structural Phase Transition ◽

Solid Solutions ◽

Order Parameter ◽

Soft Mode ◽

Magnetic Phase ◽

Structural Phase ◽

Exchange Interactions ◽

Magnetoelastic Interaction

Raman spectra of Ho[Formula: see text]NdxFe(BO3)4 ([Formula: see text], 0.75, 0.5, 0.25) have been studied in temperature range 10–400[Formula: see text]K. Two compositions ([Formula: see text], [Formula: see text]) demonstrate structural phase transition with soft mode restoration. The addition of Nd atoms increases interatomic spacing and decreases the temperature of structural phase transition. The solid solutions ([Formula: see text], 0.5, 0.25) demonstrate the emergence of the peaks corresponding to magnetoelastic interaction below Néel temperature. The order parameter of the magnetic phase transition has been determined. The equal concentrations of holmium and neodymium atoms prevent magnon soft modes condensation caused by exchange interactions in Fe–O–Fe chains are observed. Calculations confirm the data obtained in the experiment.

Download Full-text