Neutron and X-Ray Diffraction Studies of a Valence Fluctuating Compound YbInCu<sub>4</sub>

Kojima, K.; Nakai, Yoshikazu; Suzuki, Takashi; Asano, Hajime; Izumi, Fujio; Fujita, Toshizo; Hihara, T.

doi:10.1143/jpsj.59.792

Cited by 65 publications

(51 citation statements)

References 7 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, the physical properties of the sample used in the present work are nearly identical to those of the sample used in a previous work [12]: the lattice constants at 30 and 300 K in the present work agree with those estimated from the temperature dependence of 4 2 2 reflection; the temperature of the sudden drop in the magnetic susceptibility shown in Fig. 1 agrees with that of the jump in the lattice constant.…”

supporting

confidence: 86%

See 1 more Smart Citation

First-Order Structural Change Accompanied by Yb Valence Transition in YbInCu₄

et al. 2016

View full text Add to dashboard Cite

A diffraction experiment using a high energy x-ray was carried out on YbInCu4. Below the Yb valence transition temperature, the splitting of Bragg peaks was detected in higher-order reflections. No superlattice reflections accompanying the valence ordering were found below the transition temperature. These experimental findings indicate that a structural change from a cubic structure to a tetragonal structure without valence ordering occurs at the transition temperature. Such a structural change free from any valence ordering is difficult to understand only in terms of Yb valence degrees of freedom. This means that the structural change may be related to electronic symmetries such as quadrupolar degrees of freedom as well as the change in Yb valence.Valence degrees of freedom are always coupled with structural degrees of freedom because the ionic radius is changed by a change in the valence state. When valence ordering occurs in materials, the space group of their crystal structure can change because of the alignment of the ions with valence states. Meanwhile, when a valence change occurs without valence ordering, the unit cell volume is expected to change owing to the change in the ionic radius but the symmetry of the crystal structure is not expected to be changed by a valence transition. If a valence transition with a symmetric change but no valence ordering occurs, the discovery of such a valence transition would shed new light on the valence transition compounds.

show abstract

supporting

confidence: 86%

“…Thermal expansion accompanied by the change in the Yb valence was discussed using neutron diffraction experiments [12,13,14]. Both sets of experimental results suggest the absence of any structural transitions accompanied by the Yb valence transition.…”

mentioning

confidence: 99%

First-Order Structural Change Accompanied by Yb Valence Transition in YbInCu₄

et al. 2016

View full text Add to dashboard Cite

show abstract

“…8,9 YbInCu 4 has a facecentered-cubic C15b structure and the valence phase transition is accompanied by the abrupt increase in the lattice parameter by about 0.13% without any change in the space symmetry. 10,11 The cell volume was found to vary proportionally to n f . 6 In addition to the change of the lattice parameter, the electrical resistivity shows an abrupt decrease at T v .…”

Section: Introductionmentioning

confidence: 95%

Ultrasonic study of the mixed-valence systemYbIn1−xAgxCu<

et al. 1999

View full text Add to dashboard Cite

“…The specimen, placed in a vanadium tube, was mounted on a cold fmger of the HRP cryostat and cooled by a closed-cycle He refrigerator. The obtained data from room temperature down to 20 K was analyzed by the same procedure as described previously [2]. The electrical resistivity p was measured by a four probe method.…”

Section: Experimental Methodsmentioning

confidence: 99%