Spin-spin and spin-lattice relaxation ofYb3+in YbAlO3, TmAlO3: Yb, and YAlO3: Yb and magnetic ordering in YbAlO3measured by the Mössbauer effect

1978 ◽  
Vol 18 (5) ◽  
pp. 2196-2208 ◽  
Author(s):  
P. Bonville ◽  
J. A. Hodges ◽  
P. Imbert ◽  
F. Hartmann-Boutron
Keyword(s):  
Mössbauer Effect ◽  
Magnetic Ordering ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Mossbauer Effect ◽  
Spin Lattice

scholarly journals Magnetic ordering and fluctuation in Kagome lattice anti-ferromagnets, Fe and Cr jarosites

2001 ◽  
Vol 79 (11-12) ◽  
pp. 1511-1516 ◽  
Author(s):  
M Nishiyama ◽  
T Morimoto ◽  
S Maegawa ◽  
T Inami ◽  
Y Oka
Keyword(s):  
Magnetic Transition ◽  
Magnetic Ordering ◽  
Exchange Interactions ◽  
Lattice Relaxation ◽  
Spin Correlation ◽  
Spin Lattice Relaxation ◽  
Kagome Lattice ◽  
Kagomé Lattice ◽  
Spin Lattice ◽  
High Temperature Expansion

Jarosite family compounds, KFe3(OH)6(SO4)2 (abbreviated to Fe jarosite) and KCr3(OH)6(SO4)2 (Cr jarosite) are typical examples of Heisenberg anti-ferromagnets on the Kagome lattice and have been investigated by means of magnetization and NMR experiments. The susceptibility of Cr jarosite deviates from the Curie–Weiss law due to the short-range spin correlation below about 150 K and shows the magnetic transition at 4.2 K, while Fe jarosite has the transition at 65 K. The measured susceptibility fits well with the calculated one on the high-temperature expansion for the Heisenberg anti-ferromagnet on the Kagome lattice. The values of the exchange interactions of Cr jarosite and Fe jarosite are derived to be JCr = 4.9 K and JFe = 23 K, respectively. The 1H-NMR spectra of Fe jarosite suggest that the ordered spin structure is the q = 0 type 120° configuration with +1 chirality. The transition is considered to be caused by a weak single-ion type anisotropy. The spin-lattice relaxation rate, 1/T1, of Fe jarosite in the ordered phase decreases sharply with decreasing temperature and can be well explained by the two-magnon process of spin wave with the anisotropy. PACS No.: 75.25+z

NQR AND NMR STUDIES OF YBa2Cu3Ox(6.0 ≦ x ≦ 6.91)

1989 ◽  
Vol 03 (01) ◽  
pp. 93-95 ◽  
Author(s):  
TAKASHI IMAI ◽  
TADASHI SHIMIZU ◽  
HIROSHI YASUOKA ◽  
YUTAKA UEDA ◽  
KOJI KOSUGE
Keyword(s):  
Temperature Dependence ◽  
Magnetic Ordering ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Fluctuations ◽  
Spin Lattice Relaxation ◽  
Nmr Studies ◽  
Oriented Sample ◽  
Spin Lattice ◽  
Anisotropic Superconductivity

Nuclear Quadrupole Resonance (NQR) and Nuclear Magnetic Resonance (NMR) have been utilized to investigate the 90 K class superconductor YBa 2 Cu 3 O 6.91 and relevant oxides YBa 2 Cu 3 O x(6.0 ≦ x ≦ 6.91). Two 63 Cu NQR lines have been observed at about 31 MHz and 22 MHz for x = 6.91, which were proved to be from the Cu2 and Cu1 sites respectively using the NMR technique for an oriented sample. The spin-lattice relaxation time T1 exhibits anomalous temperature dependence with high relaxation rate in the normal state. Power-law like temperature dependence was observed well below T c for the Cu2 sites. The former indicates the strong influence of Cu spin fluctuations, while the latter may be understood as the realization of the anisotropic superconductivity. Antiferromagnetic nuclear resonance has been obtained for x = 6.0 yielding a clear evidence of magnetic ordering in the Cu2-O 2 planes. This is consistent with neutron scattering and μ SR studies.

63/65Cu- NQR Study of impurity-lnduced Magnetic Order in YBa2(Cu1-xMx)3O7 (M = Fe, Co)

1990 ◽  
Vol 45 (3-4) ◽  
pp. 423-428 ◽  
Author(s):  
Y. Nakamichi ◽  
K. Kumagai ◽  
H. Nakajima ◽  
T. Fujita
Keyword(s):  
Relaxation Rate ◽  
Low Temperatures ◽  
Magnetic Order ◽  
Magnetic Ordering ◽  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
Spin Lattice Relaxation Rate ◽  
Spin Lattice ◽  
System A ◽  
Magnetic Ions

Abstract We have studied 63/65 Cu NQR at the Cu(l)-chain and Cu(2)-plane site of YBa2(Cu1-x Mx)3O7 (M = Fe, Co). The spin-lattice relaxation rate, T1-1 , is enhanced at low temperatures and has in the Fe-system a peak at 2 and 4 K for x = 0.005 and 0.015, respectively. Below the peak temperatures the intensity of the Cu-NQR signal decreases rapidly. The results suggest that magnetic ordering of either Fe or Cu moments occurs without destroying the superconductivity below Tc on substituting Cu by magnetic ions.

Anisotropic 2H-NMR spin-lattice relaxation in oriented bilayers of DMPC and DMPC + cholesterol

1992 ◽  
Vol 89 ◽  
pp. 237-242 ◽  
Author(s):  
MA Krajewski-Bertrand ◽  
Y Nakatani ◽  
G Ourisson ◽  
EJ Dufourc ◽  
A Milon
Keyword(s):  
Lattice Relaxation ◽  
Spin Lattice Relaxation ◽  
2H Nmr ◽  
Spin Lattice

Dispersion of proton spin-lattice relaxation in a cholesteric liquid crystal

1983 ◽  
Vol 44 (10) ◽  
pp. 1179-1184 ◽  
Author(s):  
M. Vilfan ◽  
R. Blinc ◽  
J. Dolinšek ◽  
M. Ipavec ◽  
G. Lahajnar ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Cholesteric Liquid Crystal ◽  
Lattice Relaxation ◽  
Proton Spin ◽  
Spin Lattice Relaxation ◽  
Spin Lattice

NUCLEAR SPIN-LATTICE RELAXATION TIME IN TIN

1978 ◽  
Vol 39 (C6) ◽  
pp. C6-1215-C6-1216
Author(s):  
H. Ahola ◽  
G.J. Ehnholm ◽  
S.T. Islander ◽  
B. Rantala
Keyword(s):  
Relaxation Time ◽  
Nuclear Spin ◽  
Lattice Relaxation ◽  
Lattice Relaxation Time ◽  
Spin Lattice Relaxation ◽  
Spin Lattice Relaxation Time ◽  
Spin Lattice ◽  
Nuclear Spin Lattice Relaxation
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