Magnetic ordering of Gd and Cu in superconducting and nonsuperconducting GdBa2Cu3O7−δ

B. D. Dunlap; M. Slaski; Z. Sungaila; D. G. Hinks; K. Zhang; C. Segre; S. K. Malik; E. E. Alp

doi:10.1103/PhysRevB.37.592

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Magnetic ordering of Gd and Cu in superconducting and nonsuperconducting GdBa2Cu3O7−δ

B. D. Dunlap, M. Slaski, Z. Sungaila, D. G. Hinks, K. Zhang, C. Segre, S. K. Malik, E. E. Alp

DOI 10.1103/PhysRevB.37.592 · Physical Review B

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Abstract

An investigation of the magnetic properties of superconducting and nonsuperconducting samples of GdBa2Cu3O7−δ has been carried out. The antiferromagnetic transition temperature for the Gd ions in the material is the same for both compounds (2.2 K) although the superconducting compound shows metallic behavior and the nonsuperconducting compound shows semiconducting behavior. This provides direct evidence for the lack of magnetic interactions mediated by conduction electrons in these materials. In the nonsuperconducting material, evidence is obtained for the presence of antiferromagnetic ordering in the Cu sublattice at a temperature of 18 K.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
GdBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	93	Pressure not reported	unknown
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
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown