FIRST ORDER CRYSTALLOGRAPHIC AND MAGNETIC PHASE TRANSITION IN CrAs

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FIRST ORDER CRYSTALLOGRAPHIC AND MAGNETIC PHASE TRANSITION IN CrAs

Post by Algerien1970 on Mon 15 Jun - 17:42

FIRST ORDER CRYSTALLOGRAPHIC AND MAGNETIC PHASE TRANSITION IN CrAs 


H. Boller* and A.  Kallelt

 Laboratoire de Diffraction Neutronique, Centre d’Etudes Nucléaires, Cedex 85, 38—Grenoble—Gate, France
 (Received 20 July 1971 by E.F. Bertaut)

 Abstract : X-ray and neutron diffraction diagrams of CrAs have been prepared in the temperature range from 4.2 to 1070°K.CrAs undergoes a crystallographic and magnetic first order phase transition accompanied by a large volume increase for the low temperature phase. The transition takes place in the temperature range from 240 to 190°K and shows hysteresis and supercooling effects. The magnetic spiral structure of CrAs (1) has been refined at 4.2°Kand 198°K.The first order phase transition is interpreted as an electronic transition between localized and collective states. 


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