Direct Observation of Spontaneous Weak Ferromagnetism in the Superconductor ErNi2B2C
S.-M. Choi, J. W. Lynn, D. Lopez, P. L. Gammel, P. C. Canfield, S. L. Bud'ko
DOI 10.1103/PhysRevLett.87.107001 · Physical Review Letters
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Abstract
Neutron measurements show that superconducting ErNi2B2C ( TC=11K) develops antiferromagnetic spin density wave magnetic order ( TN=6K), which squares up with decreasing temperature yielding a series of higher-order magnetic Bragg peaks with odd harmonics. Below TWFM=2.3K where magnetization indicates a net moment develops, even-order Bragg peaks develop which low field ( ∼3Oe) 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.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| ErNi2B2C Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 11 | Pressure not reported | unknown |
| La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 42 | Pressure not reported | unknown |
| RuSr2GdCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| UGe2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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