Magnetic Property of BaFe2As2Probed by75As NMR

Fukazawa, Hideto; Yamazaki, T.; Kondo, Kenji; Hirayama, Kenji; Kohori, Yoh; Takeshita, Nao; Miyazawa, Keisuke; Kitô, Hijiri; Eisaki, H.; Iyo, A.

doi:10.1143/jpsjs.77sc.138

Cited by 5 publications

(5 citation statements)

References 11 publications

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“…For all three compounds, we find that overall both

T_{s}

and

T_{N}

are suppressed by pressure. On a gross level, this is therefore consistent with the general picture of the phase diagram of 122‐type iron‐based superconductors, [ 4,30,182–185 ] in which the application of pressure leads to a suppression of

T_{s}

and

T_{N}

. However, on a finer level, the evolution of the splitting

Δ T = T_{s} - T_{N}

(shown in the insets of Figure 6a–c) shows a more complicated behavior.…”

Section: Effect Of Hydrostatic Pressure On Superconductivity Magnetisupporting

confidence: 86%

“…[ 15,181 ] It is thus of great importance to investigate the response of

T_{s}

and

T_{N}

to a “clean” tuning parameter (i.e., hydrostatic pressure), which does not involve changing levels of disorder. Whereas the effect of pressure [ 4,30,182–185 ] is known to suppress

T_{s}

and

T_{N}

and to induce superconductivity, the finer, more quantitative details of the phase diagram under pressure in terms of

Δ T = T_{s} - T_{N}

were not elucidated. [ 186,187 ]…”

Section: Effect Of Hydrostatic Pressure On Superconductivity Magnetimentioning

confidence: 99%

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Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Gati

Bud’ko

et al. 2020

Annalen der Physik

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Iron-based superconductors are well-known for their intriguing phase diagrams, which manifest a complex interplay of electronic, magnetic, and structural degrees of freedom. Among the phase transitions observed are superconducting, magnetic, and several types of structural transitions, including a tetragonal-to-orthorhombic and a collapsed-tetragonal transition. In particular, the widely observed tetragonal-to-orthorhombic transition is believed to be a result of an electronic order that is coupled to the crystalline lattice and is, thus, referred to as nematic transition. Nematicity is therefore a prominent feature of these materials, which signals the importance of the coupling of electronic and lattice properties. Correspondingly, these systems are particularly susceptible to tuning via pressure (hydrostatic, uniaxial, or some combination). Efforts to probe the phase diagrams of pressure-tuned iron-based superconductors are reviewed with a strong focus on recent insights into the phase diagrams of several members of this material class under hydrostatic pressure. These studies on FeSe, Ba(Fe 1−x Co x) 2 As 2 , Ca(Fe 1−x Co x) 2 As 2 , and CaK(Fe 1−x Ni x) 4 As 4 are, to a significant extent, made possible by advances of what measurements can be adapted to their use under differing pressure environments. The potential impact of these tools for the study of the wider class of strongly correlated electron systems is pointed out.

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“…For all three compounds, we find that overall both

T_{s}

and

T_{N}

T_{s}

and

T_{N}

. However, on a finer level, the evolution of the splitting

Δ T = T_{s} - T_{N}

(shown in the insets of Figure 6a–c) shows a more complicated behavior.…”

Section: Effect Of Hydrostatic Pressure On Superconductivity Magnetisupporting

confidence: 86%

“…[ 15,181 ] It is thus of great importance to investigate the response of

T_{s}

and

T_{N}

to a “clean” tuning parameter (i.e., hydrostatic pressure), which does not involve changing levels of disorder. Whereas the effect of pressure [ 4,30,182–185 ] is known to suppress

T_{s}

and

T_{N}

and to induce superconductivity, the finer, more quantitative details of the phase diagram under pressure in terms of

Δ T = T_{s} - T_{N}

were not elucidated. [ 186,187 ]…”

Section: Effect Of Hydrostatic Pressure On Superconductivity Magnetimentioning

confidence: 99%

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Gati

Bud’ko

et al. 2020

Annalen der Physik

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“…12,13) The zero-field 75 As-NMR spectrum also revealed that the magnetically ordered state of this compound is commensurate. 14,15) The evaluated H int at 4.2 K decreases gradually with increasing pressure. 16) The results are consistent with the other group's NMR results obtained using single crystals.…”

mentioning

confidence: 99%

“…The obtained spectral profiles are basically the same as that of the parent material BaFe 2 As 2 . 14,15) By the same analytical procedure described in ref. 15, we evaluated the internal magnetic field H int at the As site to be 1.23 (5) T for x = 0.3 and 1.17(3) T for x = 0.4.…”

mentioning

confidence: 99%

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75As NMR Study of Hole-Doped Superconductor Ba1-xKxFe2As2 (Tc = 38K)

Fukazawa,

Yamazaki,

Kondo

et al. 2009

Preprint

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We report the 75 As nuclear magnetic resonance (NMR) measurement of the hole-doped superconductor Ba1−xKxFe2As2 with different lattice parameters and different superconducting volume fractions (Tc ≃ 38 K). 75 As-NMR spectra revealed that the magnetically ordered and superconducting phases are microscopically separated. The spin-lattice relaxation rate 1/T1 in the normal state reflects the existence of a large two-dimensional antiferromagnetic spin fluctuation. The 1/T1 in the superconducting state down to the lowest measurement temperature T varies close to T 3 . In addition, it exhibits no coherence peak just below Tc. This shows a T dependence similar to those of other iron pnictides.

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