Pressure-induced structural changes in superconducting HgBa2Can−1CunO2n+2+δ (n = 1, 2, 3) compounds

Strain derivatives ofTcin HgBa2CuO4+δ: The CuOWang1, Zhang2, Yan3 et al. 2014Phys. Rev. B

“…These values agree well with those for optimal doping [5,6,20], indicating that to first order, we can use these structure and elastic constants for Hg1201 for both the underdoped and optimally doped cases. Compressibilities at 7 and 11 GPa are given in Tab.…”

“…We find that the rate of T c increase agrees with that of optimally doped Hg1201 [3,5,9] for a wide pressure range. The effect of pressure, either uniaxial or hydrostatic, on T c is linear, i.e.…”

“…There have been a number of high pressure studies on optimally doped Hg1201, investigating how lattice parameters, atomic positions, and T c changes under both hydrostatic and uniaxial pressure [3,[5][6][7]. The uniaxial dT c /dP l (l = a, b, c) has been found from the Ehrenfest relationship dT c /dP l = ∆α l V m T c /∆C p using experimental values of the thermal expansion (α l ) and heat capacity (∆C p ) [8].…”

“…Lattice parameters, compressibilities are from this study. Values of Cu-O apical are extrapolated from neutron scattering study [5]. Tc for optimally doped Hg1201 is from [3], its buckling angle is extrapolated from [5].…”

“…Values of Cu-O apical are extrapolated from neutron scattering study [5]. Tc for optimally doped Hg1201 is from [3], its buckling angle is extrapolated from [5]. Structure of LSCO is from [28], its Tc is from [29].…”