Phase separation in the vicinity of the surface of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>κ</mml:mi><mml:mtext>−</mml:mtext><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>BEDT</mml:mi><mml:mtext>−</mml:mtext><mml:mi>TTF</mml:mi><mml:mo>)</mml:mo></mml:mrow><mml:mn>2</mml:mn></mml:msub></mml:mrow><mml:mi>Cu</mml:mi><mml:mrow><mml:mo>[</mml:mo><mml:mi mathvariant="normal">N</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mo>(</mml:mo><mml:mi>CN</mml:mi>

Yoneyama, N.; Sasaki, T.; Kobayashi, Norio; Ikemoto, Yuka; Kimura, Hiroaki

doi:10.1103/physrevb.72.214519

Cited by 14 publications

(12 citation statements)

References 34 publications

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“…This is considered to be the reason why the present system at 4.3 kbar shows the coexistence. We note that, also in the quasi-twodimensional organic system -͑BEDT-TTF͒ 2 X, 16 the coexistence of bulk insulating and metallic phases is observed near the first-order Mott transition, 17,18 which is very likely due to the same reason.…”

Section: B Schematic Phase Diagrammentioning

confidence: 68%

Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic systemEtMe3P[Pd(dmit)
Itou
¹
,
Oyamada
²
,
Maegawa
³

et al. 2009
Phys. Rev. B
20
4
25
0
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We present 13 C-NMR studies of the pressure-temperature phase diagram of the quasi-two-dimensional organic system EtMe 3 P͓Pd͑dmit͒ 2 ͔ 2 , which has a spin-gapped Mott insulating ground state at ambient pressure. As the system is pressurized, the spin-gapped insulating ground state survives until the insulator-metal Mott transition, just beyond which a superconducting state appears. This demonstrates that the superconducting phase borders the spin-gapped insulating phase. The phase diagram contrasts with those of the large majority of other correlated-electron superconductors in which the superconducting phase borders a magnetically ordered phase. This implies the possibility that the present superconductivity has an exotic origin and nature.

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Section: B Schematic Phase Diagrammentioning

confidence: 68%

Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic systemEtMe3P[Pd(dmit)
Itou
¹
,
Oyamada
²
,
Maegawa
³

et al. 2009
Phys. Rev. B
20
4
25
0
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show abstract

“…The samples were cooled down in a He-flow cryostat. The cooling rates were in the range from 0.2 K/min to 1 K/min so as to avoid a mixed state of metallic and insulating domains in κ-ET-Br 25,26 . The absence of luminescence at 3500 cm −1 proved that κ-ET-Br is in a homogeneous metallic state 27 .…”

Section: Introductionmentioning

confidence: 99%

Antiferromagnetic fluctuations in a quasi-two-dimensional organic superconductor detected by Raman spectroscopy

2015

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Using Raman scattering, the quasi-two dimensional organic superconductor -(BEDT-TTF)2-Cu[N(CN)2]Br (Tc = 11.8 K) and the related antiferromagnet -(BEDT-TTF)2Cu[N(CN)2]Cl are studied. Raman scattering provides unique spectroscopic information about magnetic degrees of freedom that has been otherwise unavailable on such organic conductors. Below T = 200 K a broad band at about 500 cm 1 develops in both compounds. We identify this band with two-magnon excitation. The position and the temperature dependence of the spectral weight are similar in the antiferromagnet and in the metallic Fermi-liquid. We conclude that antiferromagnetic correlations are similarly present in the magnetic insulator and the Fermi-liquid state of the superconductor.

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“…Further study is needed to clarify the effect of the cooling rate on the inhomogeneity of the sample and its distribution. This is important for resolving the controversy regarding superconducting parameters such as the penetration depth [14]. …”

Section: Phase Separation In the Vicinity Of The Surface By Rapid Coomentioning

confidence: 99%

“…In this article, we review the visualization of the spatial phase separation observed in the organic dimer Mott system κ-(BEDT-TTF) 2 X [12][13][14][15]. To achieve sufficient spatial resolution, a synchrotron is used as the infrared light source [16].…”

Section: Introductionmentioning

confidence: 99%

Spatial mapping of electronic states in κ-(BEDT-TTF)₂X using infrared reflectivity

Sasaki

Yoneyama

2009

Science and Technology of Advanced Materials

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We review our recent work on spatial inhomogeneity of the electronic states in the strongly correlated molecular conductors κ-(BEDT-TTF) 2 X. Spatial mapping of infrared spectra (SMIS) is used for imaging the distribution of the local electronic states. In molecular materials, the infrared response of the specific molecular vibration mode with a strong electron-molecular vibration coupling can reflect the electronic states via the change in the vibration frequency. By spatially mapping the frequency shift of the molecular vibration mode, an electronic phase separation has been visualized near the first-order Mott transition in the bandwidth-controlled organic conductor κ-(BEDT-TTF) 2 Cu[N(CN) 2 ]Br. In addition to reviewing SMIS of the phase separation, we briefly mention the electronic and optical properties of κ-(BEDT-TTF) 2 X.

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Phase separation in the vicinity of the surface ofκ−(BEDT−TTF)2Cu[N(CN

Cited by 14 publications

References 34 publications

Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic systemEtMe3P[Pd(dmit)
Itou
¹
,
Oyamada
²
,
Maegawa
³

et al. 2009
Phys. Rev. B
20
4
25
0
View full text Add to dashboard Cite

Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic systemEtMe3P[Pd(dmit)
Itou
¹
,
Oyamada
²
,
Maegawa
³

et al. 2009
Phys. Rev. B
20
4
25
0
View full text Add to dashboard Cite

Antiferromagnetic fluctuations in a quasi-two-dimensional organic superconductor detected by Raman spectroscopy

Spatial mapping of electronic states in κ-(BEDT-TTF)₂X using infrared reflectivity

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Phase separation in the vicinity of the surface ofκ−(BEDT−TTF)2Cu[N(CN

Cited by 14 publications

References 34 publications

Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic systemEtMe3P[Pd(dmit)Itou1, Oyamada2, Maegawa3 et al. 2009Phys. Rev. B204250View full textAdd to dashboardCite

Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic systemEtMe3P[Pd(dmit)Itou1, Oyamada2, Maegawa3 et al. 2009Phys. Rev. B204250View full textAdd to dashboardCite

Antiferromagnetic fluctuations in a quasi-two-dimensional organic superconductor detected by Raman spectroscopy

Spatial mapping of electronic states in κ-(BEDT-TTF)2X using infrared reflectivity

Contact Info

Product

Resources

About

Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic systemEtMe3P[Pd(dmit)
Itou
¹
,
Oyamada
²
,
Maegawa
³

et al. 2009
Phys. Rev. B
20
4
25
0
View full text Add to dashboard Cite

Superconductivity on the border of a spin-gapped Mott insulator: NMR studies of the quasi-two-dimensional organic systemEtMe3P[Pd(dmit)
Itou
¹
,
Oyamada
²
,
Maegawa
³

et al. 2009
Phys. Rev. B
20
4
25
0
View full text Add to dashboard Cite

Spatial mapping of electronic states in κ-(BEDT-TTF)₂X using infrared reflectivity