Electronic configuration of samarium sulphide and related compounds: Mössbauer-effect measurements and a model

Coey, J. M. D.; Ghatak, S.K.; Avignon, M.; Holtzberg, F.

doi:10.1103/physrevb.14.3744

Cited by 88 publications

(19 citation statements)

References 46 publications

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“…As seen from Fig. 1(a), ν estimated from high-T experiments shows a continuous evolution with P [10][11][12]. A similar smooth P -variation is observed in the conductivity σ measured at T = 150 K [ Fig.…”

Section: +supporting

confidence: 57%

“…Continuous pressure evolution of (a) mean valence ν at high temperature [10][11][12] and (b) conductivity ratio σ(P )/σ(P = 0.6 GPa) at 150 K. For the definition of ν, see text. (c) P -T phase diagram of golden SmS.…”

Section: +mentioning

confidence: 99%

“…Magnetic susceptibility revealed that the ground state at P > P c is antiferromagnetic Ref. [10] Ref. [11] Ref.…”

Section: +mentioning

confidence: 99%

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Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS

et al. 2011

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Golden SmS is a paramagnetic, mixed-valence system with a pseudogap. With increasing pressure across a critical pressure Pc, the system undergoes a discontinuous transition into a metallic, antiferromagnetically ordered state. By using a combination of thermodynamic, transport, and magnetic measurements, we show that the pseudogap results from the formation of a local bound state with spin singlet. We further argue that the transition Pc is regarded as a transition from an insulating electron-hole gas to a Kondo metal, i.e., from a spatially bound state to a Kondo virtually bound state between 4f and conduction electrons.PACS numbers: 65.40. De, 71.27.+a, 75.30 -6], which are ascribed to the interplay between 4f and conduction electrons. In these mixedvalence compounds, Coulomb repulsion between 4f electrons gives rise to a gap formation on the order 10 meV at the Fermi level. While such materials behave like a Kondo metal at temperatures (T ) higher than the gap energy, they show insulating behavior at low T . For SmB 6 , the collapse of the insulating gap and the emergence of a magnetic order occur at the same pressure [7,8], which suggests that the gap formation competes with the longrange magnetic ordering.Nonalloyed SmS undergoes a phase transition under pressure (P ). With increasing P , the system undergoes a valence transition at a critical pressure of approximately P = 0.7 GPa at T = 300 K from divalence to mixed valence, accompanied by a color change from black to golden yellow [9]. In this mixed-valence phase (named golden SmS), two configurations of 4f 6 and 4f 5 are energetically degenerate:This is also described formally as (1 − ǫ) Sm 2+ + ǫ Sm 3+with 0 ≤ ǫ ≤1, which leads to the definition of the mean valence as ν = 2(1 − ǫ) + 3ǫ. Note that the Sm 2+ ion has no magnetic moment owing to the vanishment of total angular momentum. As seen from Fig. 1(a), ν estimated from high-T experiments shows a continuous evolution with P [10-12]. A similar smooth P -variation is observed in the conductivity σ measured at T = 150 K [ Fig. 1(b)]. From these results, it is inferred that the number of electrons e on the right-hand side of eq. (1) monotonically * Present address: UVSOR Facility, Institute for Molecular Science, Okazaki 444-8585, Japan.E-mail address: imura@ims@ac.jp † E-mail address: kensho@cc.nagoya-u.ac.jp increases with P . As seen from the phase diagram of Fig. 1(c), there is no phase transition as a function of P at high T .At low T , by contrast, a magnetic transition occurs at P c ∼ 1.8 GPa [13,14]. Magnetic susceptibility revealed that the ground state at P > P c is antiferromagnetic

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Section: +supporting

confidence: 57%

Section: +mentioning

confidence: 99%

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Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS

et al. 2011

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“…The theoretically calculated samarium valency was found to be equal to 2.55+ and 2.86+ for high and low spin solutions, respectively. The experimentally estimated one is about 2.6+ using spectroscopic methods and susceptibility measurements [66][67][68] and about 2.8+ using the Vegards-low analysis of lattice constant measurements [68].…”

Section: High Pressure Golden Phase Of Smsmentioning

confidence: 99%

Electronic Structure of Mixed Valent Systems

Antonov¹,

Shpak²,

Yaresko³

2004

Condens. Matter Phys.

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The electronic structure of Tm and Sm monochalcogenides, SmB 6 and Yb 4 As 3 is theoretically investigated from the first principles, using the fully relativistic Dirac LMTO band structure method. The electronic structure is obtained using the local spin-density approximation (LSDA), as well as the so-called LSDA+U approach. While the standard LSDA approach is incapable of correctly describing the electronic structure of such materials due to the strong on-site Coulomb repulsion, the LSDA+U approach is remarkably accurate in providing a detailed agreement with experiment for a number of properties.

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“…In materials such as the samarium chalcogenides as well as in many cerium intermetallic compounds, the valence fluctuates rapidly between f n and f n−1 but the average valence is nevertheless homogeneous [3,4]. Driven by hybridization with itinerant carriers, this behavior is intimately related to the Kondo effect [5].…”

mentioning

confidence: 99%

Ultrafast pump-probe measurements of short small-polaron lifetimes in the mixed-valence perovskite Cs2Au2I6
Trigo
¹
,
Chen
²
,
Jiang
³

et al. 2012
Phys. Rev. B
23
0
16
0
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Electronic configuration of samarium sulphide and related compounds: Mössbauer-effect measurements and a model

Cited by 88 publications

References 46 publications

Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS

Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS

Electronic Structure of Mixed Valent Systems

Ultrafast pump-probe measurements of short small-polaron lifetimes in the mixed-valence perovskite Cs2Au2I6
Trigo
¹
,
Chen
²
,
Jiang
³

et al. 2012
Phys. Rev. B
23
0
16
0
View full text Add to dashboard Cite

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Electronic configuration of samarium sulphide and related compounds: Mössbauer-effect measurements and a model

Cited by 88 publications

References 46 publications

Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS

Discontinuous Transition from a Real Bound State to Virtual Bound State in a Mixed-Valence State of SmS

Electronic Structure of Mixed Valent Systems

Ultrafast pump-probe measurements of short small-polaron lifetimes in the mixed-valence perovskite Cs2Au2I6Trigo1, Chen2, Jiang3 et al. 2012Phys. Rev. B230160View full textAdd to dashboardCite

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Ultrafast pump-probe measurements of short small-polaron lifetimes in the mixed-valence perovskite Cs2Au2I6
Trigo
¹
,
Chen
²
,
Jiang
³

et al. 2012
Phys. Rev. B
23
0
16
0
View full text Add to dashboard Cite