Theory of how to distinguish a scalar from a tensor order parameter in the high-Tc superconductors

Helmut R. Brand; Mauro M. Doria

doi:10.1103/PhysRevB.37.9722

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Theory of how to distinguish a scalar from a tensor order parameter in the high-Tc superconductors

Helmut R. Brand, Mauro M. Doria

DOI 10.1103/PhysRevB.37.9722 · Physical Review B

T1

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Abstract

Using generalized Ginzburg-Landau equations, we discuss the possibility that the high-Tc superconductors do not have a scalar, but a tensor order parameter. We propose experiments to distinguish between these two possibilities both with lattice anisotropy included. A tensor order parameter implies a splitting of the upper critical field for a given setup as well as the appearance of a transverse magnetic field, when a field is applied parallel to the crystal cell axes. Only for a single scalar is the product of coherence and penetration lengths an invariant along the cell axes.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	90	Pressure not reported	unknown