Nuclear Cooperative Ordering in Single-Crystal Praseodymium at Low Temperatures

Nuclear Cooperative Ordering in Single-Crystal Praseodymium at Low Temperatures

A lambda anomaly was observed in the nuclear heat capacity of a single crystal of praseodymium known not to order down to 1.8 K. The anomaly is associated with a cooperative magnetic ordering of the hexagonal-site nuclei at 25--30 mK of the type discussed by Murao. This result is in contrast to earl...

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Veröffentlicht in:Phys. Rev. Lett., v. 35, no. 19, pp. 1297-1299 v. 35, no. 19, pp. 1297-1299, 1975-11, Vol.35 (19), p.1297-1299
Hauptverfasser: Lindelof, P. E., Miller, I. E., Pickett, G. R.
Format: Artikel
Sprache:eng
Schlagworte:
360104 -Materials-Metals & Alloys-Physical Properties
ANISOTROPY
LAMBDA POINT
MAGNETIC FIELDS
MAGNETIC SUSCEPTIBILITY
MONOCRYSTALS
N50230 -Metals, Ceramics, & Other Materials-Metals & Alloys-Properties, Structure & Phase Studies
NUCLEAR MAGNETIC MOMENTS
ORDER-DISORDER TRANSFORMATIONS
PRASEODYMIUM- NUCLEAR SPECIFIC HEAT
ULTRALOW TEMPERATURE
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Zusammenfassung:A lambda anomaly was observed in the nuclear heat capacity of a single crystal of praseodymium known not to order down to 1.8 K. The anomaly is associated with a cooperative magnetic ordering of the hexagonal-site nuclei at 25--30 mK of the type discussed by Murao. This result is in contrast to earlier calorimetric measurements where ionic order has precluded cooperative nuclear processes. The cooperative anomaly is suppressed by a field of 1.5 T. (AIP)
ISSN:0031-9007
DOI:10.1103/PhysRevLett.35.1297