Magnetic-field-induced low-energy spin excitations in YBa2Cu4O8 measured by high field Gd3+ electron spin resonance

T. Fehér, A. Jánossy, G. Oszlányi, F. Simon, Bogdan Dabrowski, Piotr W. Klamut, Mladen Horvatić, Grant V M Williams

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Abstract

We have measured the spin susceptibility, χs, of the CuO2 planes in the underdoped high Tc superconductor, YBa2Cu4O8 by Gd3+ electron spin resonance (ESR) in single crystals and aligned powders in fields up to 15.4 T. At low temperatures and high fields, χs is enhanced slightly in the B ∥ c orientation with respect to the B ⊥ c orientation. The enhancement at 15.4 T (≈0.15Hc2) at 16 K (0.2 Tc) is small: approximately 10% of χS(Tc), suggesting that the second critical field of superconductivity, Hc2 ≈ 100 T, would not suppress the pseudogap. This work demonstrates the potential of high field ESR in single crystals for studying high Tc superconductors.

Original languageEnglish
Pages (from-to)5627-5630
Number of pages4
JournalPhysical Review Letters
Volume85
Issue number26
Publication statusPublished - 2000

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electron paramagnetic resonance
single crystals
magnetic fields
excitation
superconductivity
magnetic permeability
energy
augmentation

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Magnetic-field-induced low-energy spin excitations in YBa2Cu4O8 measured by high field Gd3+ electron spin resonance. / Fehér, T.; Jánossy, A.; Oszlányi, G.; Simon, F.; Dabrowski, Bogdan; Klamut, Piotr W.; Horvatić, Mladen; Williams, Grant V M.

In: Physical Review Letters, Vol. 85, No. 26, 2000, p. 5627-5630.

Research output: Contribution to journalArticle

Fehér, T. ; Jánossy, A. ; Oszlányi, G. ; Simon, F. ; Dabrowski, Bogdan ; Klamut, Piotr W. ; Horvatić, Mladen ; Williams, Grant V M. / Magnetic-field-induced low-energy spin excitations in YBa2Cu4O8 measured by high field Gd3+ electron spin resonance. In: Physical Review Letters. 2000 ; Vol. 85, No. 26. pp. 5627-5630.
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AU - Jánossy, A.

AU - Oszlányi, G.

AU - Simon, F.

AU - Dabrowski, Bogdan

AU - Klamut, Piotr W.

AU - Horvatić, Mladen

AU - Williams, Grant V M

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AB - We have measured the spin susceptibility, χs, of the CuO2 planes in the underdoped high Tc superconductor, YBa2Cu4O8 by Gd3+ electron spin resonance (ESR) in single crystals and aligned powders in fields up to 15.4 T. At low temperatures and high fields, χs is enhanced slightly in the B ∥ c orientation with respect to the B ⊥ c orientation. The enhancement at 15.4 T (≈0.15Hc2) at 16 K (0.2 Tc) is small: approximately 10% of χS(Tc), suggesting that the second critical field of superconductivity, Hc2 ≈ 100 T, would not suppress the pseudogap. This work demonstrates the potential of high field ESR in single crystals for studying high Tc superconductors.

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