A model for elastic anomalies in K2Pt(CN)4BR 0.33H2O

Susumu Kurihara; Hidetoshi Fukuyama; Sadao Nakajima

A model for elastic anomalies in K₂Pt(CN)₄BR _0.33H₂O

Susumu Kurihara^*, Hidetoshi Fukuyama, Sadao Nakajima

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

12 Citations (Scopus)

Abstract

A "spin-lattice" model is proposed for K₂Pt(CN) ₄Br_o.3·3H₂O (KCP) to solve the puzzling problem of the apparent complete softening of shear modulus C₆₆ without any structural phase transition at low temperatures. Our model emphasizes the importance of the site II water molecules lying between bromine ions and Pt(CN)₄ complexes. Each water molecule is assumed to have three configurations, which are represented by an S=1 Ising spin. An almost complete agreement is obtained between calculation and experimental data. A marked "hardening" of C₆₆ at low temperatures (T<90 K) is predicted. A structural phase transition is possible if the spin-lattice coupling can be enhanced by e.g. external pressure. Ultrasonic attenuation coefficient α₆₆, and also C₄₄, α₄₄, are calculated.

Original language	English
Pages (from-to)	1403-1410
Number of pages	8
Journal	Journal of the Physical Society of Japan
Volume	47
Issue number	5
Publication status	Published - 1979 Nov
Externally published	Yes

ASJC Scopus subject areas

Physics and Astronomy(all)

Cite this

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title = "A model for elastic anomalies in K2Pt(CN)4BR 0.33H2O",

abstract = "A {"}spin-lattice{"} model is proposed for K2Pt(CN) 4Bro.3·3H2O (KCP) to solve the puzzling problem of the apparent complete softening of shear modulus C66 without any structural phase transition at low temperatures. Our model emphasizes the importance of the site II water molecules lying between bromine ions and Pt(CN)4 complexes. Each water molecule is assumed to have three configurations, which are represented by an S=1 Ising spin. An almost complete agreement is obtained between calculation and experimental data. A marked {"}hardening{"} of C66 at low temperatures (T<90 K) is predicted. A structural phase transition is possible if the spin-lattice coupling can be enhanced by e.g. external pressure. Ultrasonic attenuation coefficient α66, and also C44, α44, are calculated.",

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T1 - A model for elastic anomalies in K2Pt(CN)4BR 0.33H2O

AU - Kurihara, Susumu

AU - Fukuyama, Hidetoshi

AU - Nakajima, Sadao

PY - 1979/11

Y1 - 1979/11

N2 - A "spin-lattice" model is proposed for K2Pt(CN) 4Bro.3·3H2O (KCP) to solve the puzzling problem of the apparent complete softening of shear modulus C66 without any structural phase transition at low temperatures. Our model emphasizes the importance of the site II water molecules lying between bromine ions and Pt(CN)4 complexes. Each water molecule is assumed to have three configurations, which are represented by an S=1 Ising spin. An almost complete agreement is obtained between calculation and experimental data. A marked "hardening" of C66 at low temperatures (T<90 K) is predicted. A structural phase transition is possible if the spin-lattice coupling can be enhanced by e.g. external pressure. Ultrasonic attenuation coefficient α66, and also C44, α44, are calculated.

AB - A "spin-lattice" model is proposed for K2Pt(CN) 4Bro.3·3H2O (KCP) to solve the puzzling problem of the apparent complete softening of shear modulus C66 without any structural phase transition at low temperatures. Our model emphasizes the importance of the site II water molecules lying between bromine ions and Pt(CN)4 complexes. Each water molecule is assumed to have three configurations, which are represented by an S=1 Ising spin. An almost complete agreement is obtained between calculation and experimental data. A marked "hardening" of C66 at low temperatures (T<90 K) is predicted. A structural phase transition is possible if the spin-lattice coupling can be enhanced by e.g. external pressure. Ultrasonic attenuation coefficient α66, and also C44, α44, are calculated.

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A model for elastic anomalies in K₂Pt(CN)₄BR _0.33H₂O

Abstract

ASJC Scopus subject areas

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