Superconductivity at 31 K in the “111”-type iron arsenide superconductor Na
                    <sub>1−x</sub>
                    FeAs induced by pressure

Zhang, S. J.; Wang, X. C.; Liu, Q. Q.; Lv, Y. X.; Yu, Xiaohui; Lin, Zhijun; Zhao, Yusheng; Wang, Luo; Ding, Yang; Mao, Ho Kwang; Chen, Jin

doi:10.1209/0295-5075/88/47008

Cited by 45 publications

(32 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A tiny ruby was placed aside the specimen. Pressure was measured using ruby florescent method (29). We used slim Au wire of 10 μm diameter as electrodes.…”

Section: Methodsmentioning

confidence: 99%

Pressure-induced superconductivity in topological parent compound Bi ₂ Te ₃

Zhang

Weng

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

297

166

View full text Add to dashboard Cite

We report a successful observation of pressure-induced superconductivity in a topological compound Bi 2 Te 3 with T c of ∼3 K between 3 to 6 GPa. The combined high-pressure structure investigations with synchrotron radiation indicated that the superconductivity occurred at the ambient phase without crystal structure phase transition. The Hall effects measurements indicated the holetype carrier in the pressure-induced superconducting Bi 2 Te 3 single crystal. Consequently, the first-principles calculations based on the structural data obtained by the Rietveld refinement of X-ray diffraction patterns at high pressure showed that the electronic structure under pressure remained topologically nontrivial. The results suggested that topological superconductivity can be realized in Bi 2 Te 3 due to the proximity effect between superconducting bulk states and Dirac-type surface states. We also discuss the possibility that the bulk state could be a topological superconductor.high-pressure effects | pressure-tuned conductivity | topological superconductors U tilizing high pressure can be a very powerful method to generate new materials states, as demonstrated by either highpressure synthesis of new compounds, or pressure-tuned unique electronic states, such as insulator metal transitions. High pressure is particularly effective in tuning superconductivity as it is well documented that the record high superconducting transition temperature T c for either elements (1) or compounds (2) is created with the application of pressure. Recently, topological insulators (TIs) have generated great interest in the area of condensed matter physics (3-8). These materials have an insulating gap in the bulk, while also possessing conducting gapless edges or surface states in the boundaries that are protected by the timereversal symmetry (8, 9). Similar to TIs, topological superconductors have a full pairing gap in the bulk and gapless Majorana states on the edge or surface (10-13, 18). Majorana Fermions (14), half of ordinary Dirac fermions, could be very useful in topological quantum computing (15-17), which is proscriptive for new concept information technology.

show abstract

“…A tiny ruby was placed aside the specimen. Pressure was measured using ruby florescent method (29). We used slim Au wire of 10 μm diameter as electrodes.…”

Section: Methodsmentioning

confidence: 99%

Pressure-induced superconductivity in topological parent compound Bi ₂ Te ₃

Zhang

Weng

et al. 2010

Proc. Natl. Acad. Sci. U.S.A.

Self Cite

297

166

View full text Add to dashboard Cite

show abstract

“…As a result, many layered Fe-pnictide superconductors have been found, although with a T c < 60 K as suggested (2). They can be categorized into three phases-i.e., the 1111-phase (RFeAsO, where R ¼ rare earth) (1) with the ZrCuSiAs structure (P4∕nmm); the 122-phase (AeFe 2 As 2 and AFe 2 As 2 , where Ae ¼ alkaline earth and A ¼ alkaline) (3,4) with the ThCr 2 Si 2 structure (I4∕mmm); and the 111-phase (AFeAs, where A ¼ alkaline) (5,6) with the PbFCl structure (P4∕nmm). All phases possess the tetrahedrally coordinated corner sharing FeAs layers, mainly through which the superconducting carriers flow.…”

mentioning

confidence: 99%

Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure

Deng

Gooch

et al. 2011

Proc. Natl. Acad. Sci. U.S.A.

124

View full text Add to dashboard Cite

We report the detection of unusual superconductivity up to 49 K in single crystalline CaFe 2 As 2 via electron-doping by partial replacement of Ca by rare-earth. The superconducting transition observed suggests the possible existence of two phases: one starting at 49 K, which has a low critical field < 4 Oe, and the other at 21 K, with a much higher critical field > 5 T. Our observations are in strong contrast to previous reports of doping or pressurizing layered compounds AeFe 2 As 2 (or Ae122), where Ae = Ca, Sr, or Ba. In Ae122, hole-doping has been previously observed to generate superconductivity with a transition temperature ( T c ) only up to 38 K and pressurization has been reported to produce superconductivity with a T c up to 30 K. The unusual 49 K phase detected will be discussed.

show abstract

“…Furthermore, the pressure-tuned superconductivity has been reported in some "1111-", "122-", "111-", or "11"-type pnictide compounds as well. [19][20][21][22][23][24][25][26][27] For some compounds, the superconductivity can be initiated by pressure and the T c can be pushed to a maximum with initial compression, whereas for some other compounds the T c is suppressed by application of pressure monotonously. It has been explained that the T c of pnictide superconductors is closely related to the a Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2

Zhang

Zhao

et al. 2016

AIP Advances

View full text Add to dashboard Cite

The effect of pressure on superconductivity of “122” type Ca1-xNaxFe2As2 (x=0.66) single crystal is investigated through the temperature dependence of resistance measurement. Optimal Na doped (Ca0.34Na0.66)Fe2As2 shows a superconducting transition with Tc ∼ 33 K at ambient pressure. With application of pressure, Tc decreases nearly linearly with dTc/dP ∼ − 1.7K/GPa at pressures lower than 2 GPa, and disappears gradually at higher pressure. The disappearance of superconductivity is also companied with the recovery of standard Fermi liquid behaviors of the normal-state transport properties. Moreover, (Ca0.34Na0.66)Fe2As2 exhibits a tetragonal (T) to collapsed-tetragonal (cT) transition at about 3 GPa. The evolution of non-Fermi liquid behaviors and superconductivity under pressure are both related to the interband fluctuations.

show abstract

Superconductivity at 31 K in the “111”-type iron arsenide superconductor Na _1−x FeAs induced by pressure

Abstract: -The effect of pressure on superconductivity of "111" type Na 1-x FeAs is investigated through temperature dependent electrical resistance measurement in a diamond anvil cell. The superconducting transition temperature (T c ) increases from 26

Cited by 45 publications

References 31 publications

Pressure-induced superconductivity in topological parent compound Bi ₂ Te ₃

Pressure-induced superconductivity in topological parent compound Bi ₂ Te ₃

Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure

Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2

Contact Info

Product

Resources

About

Superconductivity at 31 K in the “111”-type iron arsenide superconductor Na 1−x FeAs induced by pressure

Abstract: -The effect of pressure on superconductivity of "111" type Na 1-x FeAs is investigated through temperature dependent electrical resistance measurement in a diamond anvil cell. The superconducting transition temperature (T c ) increases from 26

Cited by 45 publications

References 31 publications

Pressure-induced superconductivity in topological parent compound Bi 2 Te 3

Pressure-induced superconductivity in topological parent compound Bi 2 Te 3

Unusual superconducting state at 49 K in electron-doped CaFe 2 As 2 at ambient pressure

Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2

Contact Info

Product

Resources

About

Superconductivity at 31 K in the “111”-type iron arsenide superconductor Na _1−x FeAs induced by pressure

Pressure-induced superconductivity in topological parent compound Bi ₂ Te ₃

Pressure-induced superconductivity in topological parent compound Bi ₂ Te ₃

Unusual superconducting state at 49 K in electron-doped CaFe ₂ As ₂ at ambient pressure