Journal of the Physical Society of Japan
Online ISSN : 1347-4073
Print ISSN : 0031-9015
ISSN-L : 0031-9015
μ+SR Studies of Magnetic Properties of the YBa2Cu3Ox System
Nobuhiko NishidaHideaki MiyatakeDaisuke ShimadaSatoshi OkumaMasayasu IshikawaToshiro TakabatakeYasuhiro NakazawaYoshitaka KunoRolf KeitelJess H. BrewerTanya M. RisemanDavid Ll. WilliamsYasushi WatanabeToshimitsu YamazakiKusuo NishiyamaKanetada NagamineEduardo J. AnsaldoEiko Torikai
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1988 Volume 57 Issue 2 Pages 597-606

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Abstract
Samples of YBa2Cu3Ox in four different phases have been probed by positive muon spin relaxation (μ+SR) method. Each phase was found to show different magnetic behavior. In the famous orthorhombic 90 K superconductor (x∼6.9), neither magnetic ordering nor magnetic fluctuations were observed. However, in another orthorhombic superconducting phase (x∼6.4, Tc≈60 K) a magnetic fluctuation was observed below 7 K via muon spin-nuclear spin double relaxation. Its magnetic ordering temperature was expected to be below 2.4 K. Similar behavior was observed in an oxygen-rich (x∼6.5) tetragonal insulating phase, whereas the oxygen-deficient (x∼6.2) tetragonal insulating phase was found to be magnetically ordered, most likely antiferromagnetic, near room temperature. This is the first observation of a magnetically ordered state in the YBa2Cu3Ox system.
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