Pressure-induced shift of Tc and structural transition in “122” type pnictide superconductor Ca0.34Na0.66Fe2As2
Source abstract
Abstract
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.
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Research context
OpenAlex topics: Iron-based superconductors research · Corporate Taxation and Avoidance
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Affiliations
Chinese Academy of Sciences 1 Institute of Physics, , Beijing100190, China
Los Alamos National Laboratory 2 Los Alamos Neutron Science Center (LANSCE), , Los Alamos, New Mexico 87545, United States
University of Nevada 3 High Pressure Science and Engineering Center, , Las Vegas, Nevada 89154, United States
Brookhaven National Laboratory 4 National Synchrotron Light Source, , Upton, New York 11973, United States
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