Linear low temperature spin susceptibility in the underdoped high T-c superconductor, Gd:YBa2Cu4O8

Janossy, A [Jánossy, András (Szilárdtestfizika), author] Budapest University of Technology; Feher, T [Fehér, Titusz (Szilárdtestfizika), author]; Oszlanyi, G [Oszlányi, Gábor (Szilárdtestfizika), author] X-Ray Diffraction (SZFKI); Williams, GVM

English Article (Journal Article) Scientific
Published: PHYSICAL REVIEW LETTERS 0031-9007 1079-7114 79 (14) pp. 2726-2729 1997
    • Physical sciences
    The uniform spin susceptibility, chi(s), is determined from the Gd3+ high frequency ESR Knight shift in the underdoped high temperature superconductor, Gd:YBa2Cu4O8 (T-c = 82 K) 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 0.1T(c) to 0.4T(c), a linear temperature dependence of chi(s) is observed with a large slope. The corresponding maximum d-wave superconducting gap is Delta(0) = 190 K, 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 T-c have nodes with the same symmetry.
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    2023-09-27 17:21