Kinetic arrest of martensitic transformation in the NiCoMnIn metamagnetic shape memory alloy

Ito, Wataru; Ito, Kouhei; Umetsu, Rie Y.; Kainuma, Ryosuke; Koyama, Keiichi; Watanabe, Kazuo; Fujita, Asaya; Oikawa, Katsunari; Ishida, Kiyohito; Kanomata, Takeshi
January 2008
Applied Physics Letters;1/14/2008, Vol. 92 Issue 2, p021908
Academic Journal
Magnetic and electrical resistivity changes due to a martensitic transformation in large magnetic fields were investigated in a NiCoMnIn alloy. The transformation is interrupted at about 150 K during field cooling and does not proceed with further cooling. The obtained two-phase condition is frozen at low temperatures and zero field heating releases this condition, inducing a “forward” transformation. These unusual phenomena can be explained by an abnormal behavior in the transformation entropy change and an extremely low mobility of the phase interfaces detected at low temperatures.


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