Anisotropic dc Magnetization of Superconducting UPt3 and Antiferromagnetic Ordering Below 20 mK

Stephan Schöttl; Erwin A. Schuberth; Karol Flachbart; Jan B. Kycia; J. I. Hong; D. N. Seidman; William P. Halperin; J. Hufnagl; Ernst Bucher

doi:10.1103/PhysRevLett.82.2378

Anisotropic dc Magnetization of Superconducting UPt3 and Antiferromagnetic Ordering Below 20 mK

Stephan Schöttl, Erwin A. Schuberth, Karol Flachbart, Jan B. Kycia, J. I. Hong, D. N. Seidman, William P. Halperin, J. Hufnagl, Ernst Bucher

DOI 10.1103/PhysRevLett.82.2378 · Physical Review Letters

T1

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Abstract

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 B→ in the c^ direction we find a double superconducting transition, while for B→∥a^ 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.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.54	Pressure not reported	onset
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.551	Pressure not reported	onset
UPt3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.549	Pressure not reported	onset