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Polarised neutron study of high- Tc superconductors
The magnetization density induced by an applied magnetic field in the high- T c superconductor YBa 2Cu 3O 6+ x has been measured by polarized neutron diffraction. Measurements have been carried out on single crystals intercalated with different oxygen compositions: x = 0.52 and x = 1.00, at differen...
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Published in: | Physica. B, Condensed matter Condensed matter, 1993, Vol.192 (1), p.25-38 |
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Main Authors: | , , , , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | The magnetization density induced by an applied magnetic field in the high-
T
c superconductor YBa
2Cu
3O
6+
x
has been measured by polarized neutron diffraction. Measurements have been carried out on single crystals intercalated with different oxygen compositions:
x = 0.52 and
x = 1.00, at different fields up to 10 tesla and different temperatures. The magnetic density is located mainly on the copper sites, and the behaviour of these magnetic sites depends strongly on temperature. On the copper of the CuO
2 planes, the superconductivity is associated with a quenching of the spin part of the density: this quenching begins below
T
c for YBa
2Cu
3O
7 (
T
c = 90 K) but far above
T
c for YBa
2Cu
3O
6.52 (
T
c = 48 K). This is in accordance with the variations of the Knight shift measured by NMR. On the copper of the chains, the magnetization measured by neutrons shows a combination of Curie and Pauli paramagnetism, which practically does not depend on the onset of superconductivity and reflects the order of the chain fragments. |
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ISSN: | 0921-4526 1873-2135 |
DOI: | 10.1016/0921-4526(93)90105-F |