Interrupted Magnetic First Order Transitions and Kinetic Arrest probed with In-field Neutron Diffraction

6th European Conference on Neutron Scattering

Siruguri, V.^1 ; Kaushik, S.D.^1 ; Rayaprol, S.^1 ; Babu, P.D.^1 ; Chaddah, P.^2 ; Sampathkumaran, E.V.^3 ; Hoser, A.^4 ; Ritter, C.^5

UGC-DAE, Consortium for Scientific Research Mumbai Centre, R-5 Shed, BARC, Mumbai

400085, India^1

UGC-DAE, Consortium for Scientific Research, University Campus, Khandwa Road, Indore

452017, India^2

Tata Institute of Fundamental Research, Dr. Homi Bhabha Road, Colaba, Mumbai

400005, India^3

Helmholtz-Zentrum Berlin für Materialien und Energie, Hahn-Meitner-Platz 1, Berlin

14109, Germany^4

Institut Laue-Langevin, 71 avenue des Martyrs, Grenoble

38000, France^5

关键词: Equilibrium phase;    Equilibrium phasis;    External magnetic field;    First order transitions;    First-order phase transitions;    Meta-stable state;    Neutron diffraction studies;    Phase fractions;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/746/1/012063/pdf
DOI  :  10.1088/1742-6596/746/1/012063

来源: IOP

【 摘 要 】

In-field neutron diffraction studies were carried out on two compounds that exhibit magnetic first order phase transitions (FOPT). It is shown that the FOPT can be interrupted by an external magnetic field, resulting in a coexistence of kinetically arrested metastable states and equilibrium phases. Use of a novel protocol CHUF (Cooling and Heating under Unequal Fields) helps to determine the coexisting phase fractions and also to observe the devitrification of the kinetically arrested phase into the equilibrium phase, in a manner similar to that found in structural glassy systems.