Pressure-induced formation of intermediate-valence quasicrystalline system in a Cd-Mg-Yb alloy

Watanuki, Tetsu; Kawana, Daichi; Machida, Akihiko; Tsai, An‐Pang

doi:10.1103/physrevb.84.054207

Cited by 15 publications

(10 citation statements)

References 20 publications

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“…Magnetic susceptibility measurements at high temperature found very similar behavior for both the quasicrystal and approximant and fits using the Curie–Weiss law to the data yielded effective moments of 3.91 /Yb(3.96 /Yb) and Weiss temperatures of –153 K(–117 K) for the quasicrystal (approximant). This is in striking contrast to the absence of a local moment for in the quasicrystal and approximant at ambient pressure, although intermediate valence behavior has been observed in Yb-Cd and Yb-Mg-Cd quasicrystals under applied pressure [102–104]. The effective moments for the Yb-Au-Al systems are intermediate between and , classifying them as mixed valent as confirmed by x-ray absorption near edge structure measurements [101].…”

Section: Magnetism In Ternary Icosahedral Quasicrystalsmentioning

confidence: 99%

Magnetism in icosahedral quasicrystals: current status and open questions

Goldman

2014

Science and Technology of Advanced Materials

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Progress in our understanding of the magnetic properties of R-containing icosahedral quasicrystals (R = rare earth element) from over 20 years of experimental effort is reviewed. This includes the much studied R-Mg-Zn and R-Mg-Cd ternary systems, as well as several magnetic quasicrystals that have been discovered and investigated more recently including Sc-Fe-Zn, R-Ag-In, Yb-Au-Al, the recently synthesized R-Cd binary quasicrystals, and their periodic approximants. In many ways, the magnetic properties among these quasicrystals are very similar. However, differences are observed that suggest new experiments and promising directions for future research.

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Section: Magnetism In Ternary Icosahedral Quasicrystalsmentioning

confidence: 99%

Magnetism in icosahedral quasicrystals: current status and open questions

Goldman

2014

Science and Technology of Advanced Materials

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“…These facts often give the rather complicated phase diagram, higher critical pressure and lower transition SB054-2 temperature for Yb-system than those for Ce case. It is also suggested that the effective mass is enhanced with increasing Yb valence, and the valence can be tuned by external or chemical pressure [9,10]. Therefore, the pressure studies of divalent Yb intermetallic systems are important to reveal the formation of heavy fermion state and the quantum criticality arising from not only magnetic but valence fluctuations.…”

Section: Introductionmentioning

confidence: 99%

Development of the Valence Fluctuation in the Nearly Divalent Compound YbCu₂Ge₂under High Pressure

et al. 2012

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Pressure driven valence fluctuations of a paramagnetic compound YbCu 2 Ge 2 , having the almost divalent configuration, has been investigated via the electrical resistivity (ρ) measurement. Temperature dependence of the resistivity ρ(T ) shows typical metallic behavior expected for the non-magnetic metals at low pressure. With increasing pressure, the ρ is strongly enhanced, and a broad shoulderlike anomaly appears in the ρ(T ) curve, as observed in the valence fluctuating system. The effective mass deduced from the ρ(T ) is strongly enhanced, indicating that YbCu 2 Ge 2 changes to the heavy fermion system. The observation of the strong enhancement of the residual resistivity above 10 GPa, where the mass also starts to increase drastically, indicating the development of the valence fluctuation.

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“…Powder X-ray diraction patterns of (Au1−xCux)49Al34Yb17 alloys. +2.1 [9]. This means that the Yb valence increases as the quasilattice constant decreases under applied pressure.…”

Section: Methodsmentioning

confidence: 84%

“…Meanwhile, Watanuki et al attempted to increase the Yb valence by applying pressure to the icosahedral Cd 23 Mg 61 Yb 16 [9]. They found that the Yb valence increases with pressure, suggesting that the decrease of the quasilattice constant may be a key to realize the intermediate valence state of Yb.…”

Section: Introductionmentioning

confidence: 99%

Magnetic Properties of Icosahedral (Au,Cu)-Al-Yb Quasicrystals

et al. 2014

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We have synthesized Cu-substituted (Au,Cu)AlYb quasicrystals in order to investigate the relationship between the quasilattice constant and the magnetic property. The quasilattice constant aR is found to decrease as Au is replaced by Cu, and the maximum reduction of 2.18% in aR was observed for x = 0.60 in (Au1−xCux)49Al34Yb17. Magnetic measurements of (Au1−xCux)49Al34Yb17 (x = 0, 0.10, 0.20, 0.50) show that the intermediate-valence state of Yb persists in all the studied compositions. The eective magnetic moment is found to depend onr/aR rather than on the quasilattice constant aR. This suggests thatr/aR can be regarded as a measure of the chemical pressure induced on the Yb atoms.

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Pressure-induced formation of intermediate-valence quasicrystalline system in a Cd-Mg-Yb alloy

Cited by 15 publications

References 20 publications

Magnetism in icosahedral quasicrystals: current status and open questions

Magnetism in icosahedral quasicrystals: current status and open questions

Development of the Valence Fluctuation in the Nearly Divalent Compound YbCu₂Ge₂under High Pressure

Magnetic Properties of Icosahedral (Au,Cu)-Al-Yb Quasicrystals

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Pressure-induced formation of intermediate-valence quasicrystalline system in a Cd-Mg-Yb alloy

Cited by 15 publications

References 20 publications

Magnetism in icosahedral quasicrystals: current status and open questions

Magnetism in icosahedral quasicrystals: current status and open questions

Development of the Valence Fluctuation in the Nearly Divalent Compound YbCu2Ge2under High Pressure

Magnetic Properties of Icosahedral (Au,Cu)-Al-Yb Quasicrystals

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Development of the Valence Fluctuation in the Nearly Divalent Compound YbCu₂Ge₂under High Pressure