Magnetic order induced by hydrogen in superconducting RBa2Cu4O8 (R=Y,Gd) studied by Mössbauer and NQR techniques

I. Felner, U. Asaf, I. Nowik, E. R. Bauminger, L. Frenkel-Ben Yakar, S. D. Goren, C. Korn, H. Ltgemeier, S. Schmenn, H. Schone

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Magnetic susceptibility, Mössbauer spectroscopy, nuclear quadrupole resonance of Cu (NQR), nuclear magnetic resonance of Cu in the hyperfine field of the antiferromagnetic state (AFNMR), and x-ray diffraction measurements were performed to study the superconducting and magnetic properties of hydrogen charged bulk YBa2Cu4O8Hy. For y<1 the c lattice parameter decreases with y. In contrast to Fe-doped YBa2Cu3O7Hy, where Tc decreases continuously with increasing y, we find here that for 1% Fe doped, Tc=59 K is unaffected by hydrogen charging, but the shielding fraction is reduced sharply from 38% for y=0 to 17% and 3% for y=1 and 1.85, respectively. The Mössbauer spectra for y=0 at T>90 K contain one doublet. The spectra for hydrogen charged samples, in addition to this doublet, contain a magnetic pattern composed of two sextets, between 4.1 K and TN=360 K. The relative amount of the magnetic pattern depends on hydrogen concentration. The Mössbauer spectrum obtained for y=1 is a superposition of spectra obtained for y=0 and those for y=2, showing a phase separation into magnetic and superconducting regions in YBa2Cu4O8Hy. NQR-AFNMR studies of YBa2Cu4O8Hy and GdBa2Cu4O8Hy samples indicate that magnetic order is induced only in the Cu(2) planes.

Original languageEnglish
Pages (from-to)15858-15863
Number of pages6
JournalPhysical Review B
Issue number21
StatePublished - 1 Jan 1994

ASJC Scopus subject areas

  • Condensed Matter Physics


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