Phys. Rev. Lett. 82, 2378–2381 (1999)Anisotropic dc Magnetization of Superconducting UPt3 and Antiferromagnetic Ordering Below 20 mKReceived 6 May 1998; revised 6 August 1998; published in the issue dated 15 March 1999 We have measured the dc magnetization of three high-quality single crystals of UPt3 with a SQUID magnetometer down to ≈5mK in magnetic fields below 2 mT. With B⃗ in the ĉ direction we find a double superconducting transition, while for B⃗∥â we observe only one. At lower temperatures the temperature dependence of the magnetization follows power laws indicating unconventional behavior for the penetration depth. Below 20 mK a steep diamagnetic drop occurs, coinciding with the specific heat anomaly which we found earlier at 18 mK, pointing to static antiferromagnetic order. © 1999 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.82.2378
DOI:
10.1103/PhysRevLett.82.2378
PACS:
74.70.Tx, 75.20.Hr, 75.40.Cx
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