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Title: Pressure-induced shift of T c and structural transition in “122” type pnictide superconductor Ca 0.34Na 0.66Fe 2As 2

Abstract

Here, the effect of pressure on superconductivity of “122” type Ca 1-xNa xFe 2As 2 (x=0.66 single crystal is investigated through the temperature dependence of resistanc measurement. Optimal Na doped (Ca 0.34Na 0.66)Fe 2As 2 shows a superconductin transition with T c ~ 33 K at ambient pressure. With application of pressure, T decreases nearly linearly with d Tc/d P ~ -1.7K/GPa at pressures lower than 2 GPa and disappears gradually at higher pressure. The disappearance of superconductivit is also companied with the recovery of standard Fermi liquid behaviors of th normal-state transport properties. Moreover, (Ca 0.34Na 0.66)Fe 2As 2 exhibits a tetragona (T) to collapsed-tetragonal (c T) transition at about 3 GPa. The evolution o non-Fermi liquid behaviors and superconductivity under pressure are both relate to the interband fluctuations.

Authors:
 [1];  [1];  [2];  [3];  [1];  [1];  [1];  [4];  [5];  [1]
  1. Chinese Academy of Sciences (CAS), Beijing (China)
  2. Chinese Academy of Sciences (CAS), Beijing (China); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  3. Univ. of Nevada, Las Vegas, NV (United States)
  4. Brookhaven National Lab. (BNL), Upton, NY (United States)
  5. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1332361
Grant/Contract Number:
NA0001982
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
AIP Advances
Additional Journal Information:
Journal Volume: 6; Journal Issue: 7; Journal ID: ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; sodium; high pressure; diamond anvil cells; superconducting transitions; single crystals

Citation Formats

Zhang, Sijia, Zhao, Kan, Yu, Xiaohui, Zhu, Jinlong, Liu, Qingqing, Wang, Xiancheng, Feng, Shaomin, Chen, Zhiqiang, Zhao, Yusheng, and Jin, Changqing. Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2. United States: N. p., 2016. Web. doi:10.1063/1.4958873.
Zhang, Sijia, Zhao, Kan, Yu, Xiaohui, Zhu, Jinlong, Liu, Qingqing, Wang, Xiancheng, Feng, Shaomin, Chen, Zhiqiang, Zhao, Yusheng, & Jin, Changqing. Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2. United States. doi:10.1063/1.4958873.
Zhang, Sijia, Zhao, Kan, Yu, Xiaohui, Zhu, Jinlong, Liu, Qingqing, Wang, Xiancheng, Feng, Shaomin, Chen, Zhiqiang, Zhao, Yusheng, and Jin, Changqing. 2016. "Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2". United States. doi:10.1063/1.4958873. https://www.osti.gov/servlets/purl/1332361.
@article{osti_1332361,
title = {Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2},
author = {Zhang, Sijia and Zhao, Kan and Yu, Xiaohui and Zhu, Jinlong and Liu, Qingqing and Wang, Xiancheng and Feng, Shaomin and Chen, Zhiqiang and Zhao, Yusheng and Jin, Changqing},
abstractNote = {Here, the effect of pressure on superconductivity of “122” type Ca1-xNaxFe2As2 (x=0.66 single crystal is investigated through the temperature dependence of resistanc measurement. Optimal Na doped (Ca0.34Na0.66)Fe2As2 shows a superconductin transition with Tc ~ 33 K at ambient pressure. With application of pressure, T decreases nearly linearly with dTc/dP ~ -1.7K/GPa at pressures lower than 2 GPa and disappears gradually at higher pressure. The disappearance of superconductivit is also companied with the recovery of standard Fermi liquid behaviors of th normal-state transport properties. Moreover, (Ca0.34Na0.66)Fe2As2 exhibits a tetragona (T) to collapsed-tetragonal (cT) transition at about 3 GPa. The evolution o non-Fermi liquid behaviors and superconductivity under pressure are both relate to the interband fluctuations.},
doi = {10.1063/1.4958873},
journal = {AIP Advances},
number = 7,
volume = 6,
place = {United States},
year = 2016,
month = 7
}

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  • Irradiation with 2.5 MeV electrons at doses up to 5.2×1019 electrons/cm2 was used to introduce pointlike defects in single crystals of Ba1-xKxFe2As2 with x=0.19 (Tc=14K),0.26 (Tc=32K), 0.32 (Tc=37K), and 0.34 (Tc=39K) to study the superconducting gap structure by probing the effect of nonmagnetic scattering on electrical resistivity ρ(T) and London penetration depth λ(T). For all compositions, the irradiation suppressed the superconducting transition temperature Tc and increased resistivity. The low-temperature behavior of λ(T) is best described by the power-law function, Δλ(T)=A(T/Tc)n. While substantial suppression of Tc supports s± pairing, in samples close to the optimal doping, x=0.26, 0.32, and 0.34, themore » exponent n remained high (n≥3), indicating almost exponential attenuation and thus a robust full superconducting gap. For the x=0.19 composition, which exhibits coexistence of superconductivity and long-range magnetism, the suppression of Tc was much more rapid, and the exponent n decreased toward the s± dirty limit of n=2. In this sample, the irradiation also suppressed the temperature of structural/magnetic transition Tsm from 103 to 98 K, consistent with the itinerant nature of the long-range magnetic order. Our results suggest that underdoped compositions, especially in the coexisting regime, are most susceptible to nonmagnetic scattering and imply that in multiband Ba1-xKxFe2As2 superconductors, the ratio of the interband to intraband pairing strength, as well as the related gap anisotropy, increases upon the departure from the optimal doping.« less
  • We report here the pressure dependence of the electrical resistivity and magnetic susceptibility of polycrystalline Ce{sub 0.6}Y{sub 0.4}FeAsO{sub 0.8}F{sub 0.2} superconductor in the temperature range 4 K to 300 K up to 8 GPa. In-situ high pressure-low temperature x-ray diffraction was performed at 8 K up to 32 GPa using synchrotron x-rays with helium pressure medium. The results show that the applied pressure slightly increases the T{sub c} up to 1 GPa and then it decreases on further pressure increase. The reduction of superconducting transition temperature occurs with a transition to a collapsed tetragonal phase and may be associated withmore » a possible valence change of Ce.« less
  • Utilizing the strain-induced lateral-layer ordering (SILO) process, we have grown Ga{sub {ital x}}In{sub 1{minus}{ital x}}P multiple quantum wires (MQWR) on ternary GaAs{sub 0.66}P{sub 0.34} substrates using a modified strain-balance mechanism. The resulting [110] lateral modulation occurred with a periodicity of {approximately}300 A. Two dimensions of quantum confinement were obtained by surrounding the laterally confined Ga{sub {ital x}}In{sub 1{minus}{ital x}}P regions by layers of higher-energy-gap Al{sub 0.15}Ga{sub 0.53}In{sub 0.32}P in the growth direction. A redshift in the photoluminescence emission was observed as the growth temperature was increased attributed to a stronger lateral composition modulation at the higher growth temperatures. Based onmore » the modified strain-balance mechanism, light-emitting diodes with the Ga{sub {ital x}}In{sub 1{minus}{ital x}}P MQWR active region were fabricated using the SILO process. Strongly TE-polarized room-temperature electroluminescence from these devices was observed at 6470 A. {copyright} {ital 1996 American Institute of Physics.}« less
  • (Pb{sub 0.97}La{sub 0.03})(Zr{sub 0.66}Ti{sub 0.34}){sub 0.9875}O{sub 3}, PLZT, thin films deposited on either LaNiO{sub 3} (LNO) or LNO/Pt coated Si{sub 3}N{sub 4}/Si substrates, possessing good ferroelectric properties, were successfully obtained by the pulsed laser deposition process. Using LNO/Pt as double layer electrodes not only resulted in PLZT films with superior electric properties, but also of better handling endurance. The former is attributed to the low surface resistivity of electrode materials (i.e., {rho}{sub LNO/Pt}=0.5 m{Omega}cm) due to the bypassing effect of the Pt layer, whereas the latter is ascribed to the induction of compressive stress on PLZT and LNO layers duemore » to a relatively larger thermal expansion coefficient (CTE) of the Pt layer. The ferroelectric properties of (PLZT){sub LNO/pt} films were P{sub r}=16.5 {mu}C/cm{sup 2} and E{sub c}=63.5 kV/cm, while the dielectric constant and leakage current were K=1.028 and J{sub e}{le}8{times}10{sup {minus}6} A/cm{sup 2} (under 150 kV/cm), respectively. Their fatigue life was longer than 2{times}10{sup 9}cycles under action of 300 kV/cm pulse. {copyright} {ital 1997 American Institute of Physics.}« less