| Autor: |
Andrei T. Savici, R.J Birgenau, Marc Kastner, Graeme Luke, Young S. Lee, Yasutomo J. Uemura, Y. Fudamoto, M. I. Larkin, Kenji M. Kojima, I. M. Gat |
| Rok vydání: |
2000 |
| Předmět: |
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| Zdroj: |
Physica B: Condensed Matter. :338-342 |
| ISSN: |
0921-4526 |
| DOI: |
10.1016/s0921-4526(00)00406-3 |
| Popis: |
Zero-field (ZF) and transverse-field (TF) μSR measurements have been performed on a superconducting La2CuO4+y crystal with y=0.12 where excess oxygen is intercalated to form a stage-4 structure. Measurements are made on the same single-crystal sample studied in the neutron scattering measurements of Lee et al. [Phys. Rev. B 60 (1999) 3643] who find that both superconductivity and static incommensurate magnetic modulation develop below T c ∼T N ∼42 K . The amplitude of the muon precession signal observed in ZF-μSR increases progressively below TN and saturates at T→0 to the value which indicates that a static magnetic field from Cu moments exists in only a part of muon sites corresponding to a magnetic site fraction of VM=41%. The observed frequency ∼3.5 MHz of the precession signal suggests the development of a large (at least 0.4 μ B ) static Cu moment near the “magnetic” muon sites. Comparing the TF-μSR results with computer simulations, we obtained VM(T→0)=42%. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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