Size effects, double doping, and suppression of superconductivity in the martensitic low-temperature-tetragonal transformations of (La,Ba,Sr)2CuO4

J. C. Phillips

doi:10.1103/PhysRevB.47.2944

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Size effects, double doping, and suppression of superconductivity in the martensitic low-temperature-tetragonal transformations of (La,Ba,Sr)2CuO4

J. C. Phillips

DOI 10.1103/PhysRevB.47.2944 · Physical Review B

T1

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Abstract

An orthorhombic-low-temperature-tetragonal phase transition occurs at T=Td2 in La2−x1−x2Mx1Mx2′Cu1−y2My2″O4 alloys which suppresses superconductivity and produces local Cu magnetic moments. The origin of this transition can be inferred from the dependence of Tc and Td2 on M=Ba,Sr, M′=Ce,Th, and M″=Ni, Zn, and Ga as well as x1. The transition is caused by elastic strain energies due to substitutional size misfit and it produces 4×4 M superlattice microdomains, in agreement with an earlier theoretical model.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-x-x2Mx1Mx2'Cu1-y2My2"O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-x-x2Mx1Mx2'CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xMxCu1-y2My'O4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
La2-xBaxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown