As-NMR/NQR study of pressure-induced superconductivity in CaFe2As2

Kawasaki, Shinji; T, Oka; Tabuchi, Takaji; Wang, X. F.; Chen, X. H.; Zheng, Guojun

doi:10.1016/j.jpcs.2010.10.010

Cited by 5 publications

(3 citation statements)

References 40 publications

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“…The results are in good agreement with the T dependence of 75 As NQR in the LT cT phase induced by the application of high pressure 10.8 kbar on CaFe 2 As 2 crystals. 22,23 Since the EFG at the 75 As is parallel to the c-axis which corresponds to the quantization axis, the relaxation is expected to be the same with that obtained from the NMR with H c axis. Actually, the 1/T 1 T data by NQR at zero field are in good agreement with that of NMR with H c axis, indicating the absence of magnetic field effects on T 1 values.…”

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confidence: 91%

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Suppression of electron correlations in the collapsed tetragonal phase ofCaFe2As2under ambient pressure demonstrated byAs75
Furukawa
¹
,
Roy
²
,
Ran
³

et al. 2014
Phys. Rev. B
36
8
47
1
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The static and the dynamic spin correlations in the low temperature collapsed tetragonal and the high temperature tetragonal phase in CaFe2As2 have been investigated by 75 As nuclear magnetic resonance (NMR) and nuclear quadrupole resonance (NQR) measurements. Through the temperature (T ) dependence of the nuclear spin lattice relaxation rates (1/T1) and the Knight shifts, although stripe-type antiferromagnetic (AFM) spin correlations are realized in the high temperature tetragonal phase, no trace of the AFM spin correlations can be found in the non-superconducting, low temperature, collapsed tetragonal (cT ) phase. Given that there is no magnetic broadening in 75 As NMR spectra, together with the T -independent behavior of magnetic susceptibility χ and the T dependence of 1/T1T χ, we conclude that Fe spin correlations are completely quenched statically and dynamically in the non-superconducting cT phase in CaFe2As2.

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confidence: 91%

“…Kawasaki et al . 22,23 reported the T -independent behavior of 1/T 1 T on 75 As-NQR in the cT phase in CaFe 2 As 2 under pressure of 10.8 kbar, demonstrating the absence of the superconducting state in the cT phase. Ma et al .…”

mentioning

confidence: 98%

Suppression of electron correlations in the collapsed tetragonal phase ofCaFe2As2under ambient pressure demonstrated byAs75
Furukawa
¹
,
Roy
²
,
Ran
³

et al. 2014
Phys. Rev. B
36
8
47
1
View full text Add to dashboard Cite

show abstract

“…The results are in good agreement with the T dependence of 75 As NQR in the LT c−T phase induced by the application of high pressure 10.8 kbar on CaFe 2 As 2 crystals [175] [176]. The 1/T 1 T data by NQR at zero field are in good agreement with that obtained from the NMR with H c axis values which is consistent with the fact that the EFG at the As-site is parallel to the c-axis which is the quantization axis.…”

Section: Introductionsupporting

confidence: 74%

Low-temperature nuclear magnetic resonance investigation of systems frustrated by competing exchange interactions

Roy

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Arsenic chemistry of iron-based superconductors and strategy for novel superconducting materials

Nohara

Kudo

2017

Advances in Physics: X

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The progress of materials discovery of iron-based superconductors is reviewed with the emphasis on the valence states and chemical bonds of arsenic. We demonstrate that monovalent As -produces the 112-type CaFeAs 2 with arsenic zigzag chains. When co-doping of La and Sb is performed, the superconducting transition temperature rises to 47 K. In the 10-4-8-type Ca 10 (Pt 4 As 8 )(Fe 2−x Pt x As 2 ) 5 , the divalent As 2-produces As 2 molecules, and creates an interlayer substance with PtAs 4 planar squares. The maximum superconducting transition temperature is 38 K. In the 122-type CaFe 2 As 2 , Rh doping induces a lattice collapse transition accompanying the formation of As 2 molecules between the adjacent FeAs layers. This transition can be viewed as a valence transition between As 3-and As 2-. These properties of arsenic that produces various chemical bonds can be used to create new superconducting materials.

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As-NMR/NQR study of pressure-induced superconductivity in CaFe2As2

Cited by 5 publications

References 40 publications

Suppression of electron correlations in the collapsed tetragonal phase ofCaFe2As2under ambient pressure demonstrated byAs75
Furukawa
¹
,
Roy
²
,
Ran
³

et al. 2014
Phys. Rev. B
36
8
47
1
View full text Add to dashboard Cite

Suppression of electron correlations in the collapsed tetragonal phase ofCaFe2As2under ambient pressure demonstrated byAs75
Furukawa
¹
,
Roy
²
,
Ran
³

et al. 2014
Phys. Rev. B
36
8
47
1
View full text Add to dashboard Cite

Low-temperature nuclear magnetic resonance investigation of systems frustrated by competing exchange interactions

Arsenic chemistry of iron-based superconductors and strategy for novel superconducting materials

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As-NMR/NQR study of pressure-induced superconductivity in CaFe2As2

Cited by 5 publications

References 40 publications

Suppression of electron correlations in the collapsed tetragonal phase ofCaFe2As2under ambient pressure demonstrated byAs75Furukawa1, Roy2, Ran3 et al. 2014Phys. Rev. B368471View full textAdd to dashboardCite

Suppression of electron correlations in the collapsed tetragonal phase ofCaFe2As2under ambient pressure demonstrated byAs75Furukawa1, Roy2, Ran3 et al. 2014Phys. Rev. B368471View full textAdd to dashboardCite

Low-temperature nuclear magnetic resonance investigation of systems frustrated by competing exchange interactions

Arsenic chemistry of iron-based superconductors and strategy for novel superconducting materials

Contact Info

Product

Resources

About

Suppression of electron correlations in the collapsed tetragonal phase ofCaFe2As2under ambient pressure demonstrated byAs75
Furukawa
¹
,
Roy
²
,
Ran
³

et al. 2014
Phys. Rev. B
36
8
47
1
View full text Add to dashboard Cite

Suppression of electron correlations in the collapsed tetragonal phase ofCaFe2As2under ambient pressure demonstrated byAs75
Furukawa
¹
,
Roy
²
,
Ran
³

et al. 2014
Phys. Rev. B
36
8
47
1
View full text Add to dashboard Cite