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

Journal Article · · AIP Advances
DOI:https://doi.org/10.1063/1.4958873· OSTI ID:1332361
 [1];  [2];  [3];  [4];  [2];  [2];  [2];  [5];  [6];  [2]
  1. Chinese Academy of Sciences (CAS), Beijing (China); UNLV
  2. Chinese Academy of Sciences (CAS), Beijing (China)
  3. Chinese Academy of Sciences (CAS), Beijing (China); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. Univ. of Nevada, Las Vegas, NV (United States)
  5. Brookhaven National Lab. (BNL), Upton, NY (United States)
  6. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
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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.
Research Organization:
Univ. of Nevada, Las Vegas, NV (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA)
Grant/Contract Number:
NA0001982
OSTI ID:
1332361
Journal Information:
AIP Advances, Journal Name: AIP Advances Journal Issue: 7 Vol. 6; ISSN AAIDBI; ISSN 2158-3226
Publisher:
American Institute of Physics (AIP)Copyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
diamond anvil cells
high pressure
single crystals
sodium
superconducting transitions