Direct Observation of Spontaneous Weak Ferromagnetism in the Superconductor ErNi2B2C

S. M. Choi, J. W. Lynn, D. Lopez, P. L. Gammel, P. C. Canfield

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Neutron measurements show that superconducting ErNi2B2C (TC = 11 K) develops antiferromagnetic spin density wave magnetic order (TN = 6 K), which squares up with decreasing temperature yielding a series of higher-order magnetic Bragg peaks with odd harmonics. Below TWFM = 2.3 K where magnetization indicates a net moment develops, even-order Bragg peaks develop which low field (∼3 Oe) polarized beam measurements show are magnetic in origin. The data directly demonstrate the existence of a net magnetization with a periodicity of 20a, confirming the microscopic coexistence of spontaneous weak ferromagnetism with superconductivity.

Original languageEnglish (US)
JournalPhysical review letters
Issue number10
StatePublished - 2001

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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