Linear Low Temperature Spin Susceptibility in the Underdoped High Tc Superconductor, Gd:YBa2Cu4O8

A. Jánossy; T. Fehér; G. Oszlányi; G. V. M. Williams

doi:10.1103/PhysRevLett.79.2726

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Linear Low Temperature Spin Susceptibility in the Underdoped High Tc Superconductor, Gd:YBa2Cu4O8

A. Jánossy, T. Fehér, G. Oszlányi, G. V. M. Williams

DOI 10.1103/PhysRevLett.79.2726 · Physical Review Letters

T1

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Abstract

The uniform spin susceptibility, χs, is determined from the Gd3+ high frequency ESR Knight shift in the underdoped high temperature superconductor, Gd:YBa2Cu4O8 (Tc=82K) between 8 to 260 K. Measurements at two fields (5.4 and 8.1 T) permit high precision at low temperatures. In the range of 0.1Tc to 0.4Tc, a linear temperature dependence of χs is observed with a large slope. The corresponding maximum d-wave superconducting gap is Δ0=190K, 1.1 times the weakly coupled d-wave limit. The results support suggestions that the normal state gap observed below 180 K and the superconducting gap below Tc have nodes with the same symmetry.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Gd:YBa2Cu4O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	82	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown