TY - JOUR
T1 - Magnetic order induced by hydrogen in superconducting RBa2Cu4O8 (R=Y,Gd) studied by Mössbauer and NQR techniques
AU - Felner, I.
AU - Asaf, U.
AU - Nowik, I.
AU - Bauminger, E. R.
AU - Frenkel-Ben Yakar, L.
AU - Goren, S. D.
AU - Korn, C.
AU - Ltgemeier, H.
AU - Schmenn, S.
AU - Schone, H.
PY - 1994/1/1
Y1 - 1994/1/1
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=25944439404&partnerID=8YFLogxK
U2 - 10.1103/PhysRevB.50.15858
DO - 10.1103/PhysRevB.50.15858
M3 - Article
AN - SCOPUS:25944439404
SN - 0163-1829
VL - 50
SP - 15858
EP - 15863
JO - Physical Review B
JF - Physical Review B
IS - 21
ER -