Valence fluctuation phenomena

Lawrence, J. M.; Riseborough, Peter S.; Parks, R. D.

doi:10.1088/0034-4885/44/1/001

Cited by 944 publications

(354 citation statements)

References 322 publications

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“…The temperature of the critical point is directly related to the shear modulus of the material. We show that critical exponents are MF like, and this remains true even in the presence of short-range interactions, providing a straightforward explanation to old experiments in mixed-valence systems [2]. We discuss under what conditions the transition occurs with a softening of the bulk modulus and discuss its critical behavior.…”

Section: Introductionsupporting

confidence: 67%

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Thermodynamics of volume-collapse transitions in cerium and related compounds

2005

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We present a non-linear elastic model of a coherent transition with discontinuous volume change in an isotropic solid. The model reproduces the anomalous thermodynamics typical of coherent equilibrium including intrinsic hysteresis (for a pressure driven experiment) and a negative bulk modulus. The novelty of the model is that the statistical mechanics solution can be easily worked out. We find that coherency leads to an infinite-range density-density interaction, which drives classical critical behavior. The pressure width of the hysteresis loop shrinks with increasing temperature, ending at a critical point at a temperature related to the shear modulus. The bulk modulus softens with a 1/2 exponent at the transition even far from the critical point. Many well known features of the phase diagram of Ce and related systems are explained by the model.

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Section: Introductionsupporting

confidence: 67%

“…A wedge where nucleation does not occur is observed in Ce [1,2], SmS [27] and related systems. Interestingly it is also observed in a volume-collapse transition in amorphous ice [28].…”

Section: Comparison With Experimentsmentioning

confidence: 99%

Thermodynamics of volume-collapse transitions in cerium and related compounds

2005

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“…In a system with heavy elements, the large SOC can stabilize the localized spin-orbit Mott state as observed in iridates 9 , and then the charge-ordered Mott state naturally leads a novel electronic framework of the interplay. Further, if the localized Mott state interacts with itinerant conduction electrons, the system possibly experiences valence fluctuations as in the 4f rare-earth materials 10 and exhibits unprecedented physical phenomena. IrTe 2 was reported as a new CDW material with a modulation vector q ¼ (1/5 0 1/5) below a CDW transition temperature T C B260 K and also as a mother compound of Ir based superconductors [11][12][13] .…”

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confidence: 99%

Charge-ordering cascade with spin–orbit Mott dimer states in metallic iridium ditelluride

Lee

Kim

et al. 2015

Nat Commun

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Spin-orbit coupling results in technologically-crucial phenomena underlying magnetic devices like magnetic memories and energy-efficient motors. In heavy element materials, the strength of spin-orbit coupling becomes large to affect the overall electronic nature and induces novel states such as topological insulators and spin-orbit-integrated Mott states. Here we report an unprecedented charge-ordering cascade in IrTe 2 without the loss of metallicity, which involves localized spin-orbit Mott states with diamagnetic Ir 4 þ -Ir 4 þ dimers. The cascade in cooling, uncompensated in heating, consists of first order-type consecutive transitions from a pure Ir 3 þ phase to Ir 3 þ -Ir 4 þ charge-ordered phases, which originate from Ir 5d to Te 5p charge transfer involving anionic polymeric bond breaking. Considering that the system exhibits superconductivity with suppression of the charge order by doping, analogously to cuprates, these results provide a new electronic paradigm of localized charge-ordered states interacting with itinerant electrons through large spin-orbit coupling.

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“…Indeed, PES measurements concept of a Kondo or Anderson lattice appears to on heavy fermions have been abundant (see Refs. date back to Lawrence et al [14], but the reader is [9,25], and references therein) owing to the very referred also to an excellent review of theoretical specific predictions of the GS and NCA regarding approaches by Lee et al [13].…”

mentioning

confidence: 99%