Journal
PHYSICAL REVIEW B
Volume 87, Issue 13, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.134421
Keywords
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Funding
- European Community's 7th Framework Programme [214864]
- EPSRC [EP/G060940/1]
- Office of Basic Energy Sciences, Materials Sciences Division of the Office of Science, U.S. Department of Energy
- U.S. Department of Energy [DE-AC02-07CH11358]
- Engineering and Physical Sciences Research Council [EP/E016243/1, EP/G060940/1] Funding Source: researchfish
- EPSRC [EP/G060940/1, EP/E016243/1] Funding Source: UKRI
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We examine the character of the itinerant magnetic transition of DyCo2 by different calorimetric methods, thereby separating the heat capacity and latent heat contributions to the entropy-allowing direct comparison to other itinerant electron metamagnetic systems. The heat capacity exhibits a large lambda-like peak at the ferrimagnetic ordering phase transition, a signature that is remarkably similar to La(Fe,Si)(13), where it is attributed to giant spin fluctuations. Using calorimetric measurements, we also determine the point at which the phase transition ceases to be first order: the critical magnetic field, mu H-0(crit) = 0.4 +/- 0.1 T and temperature T-crit = 138.5 +/- 0.5 K, and we compare these values to those obtained from analysis of magnetization by application of the Shimizu inequality for itinerant electron metamagnetism. Good agreement is found between these independent measurements, thus establishing the phase diagram and critical point with some confidence. In addition, we find that the often-used Banerjee criterion may not be suitable for determination of first order behavior in itinerant magnet systems. DOI: 10.1103/PhysRevB.87.134421
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