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Charge-density-wave order and multiple magnetic transitions in divalent europium compound EuAl$$_4$$

Kaneko, Koji  ; Kawasaki, Takuro ; Nakamura, Ai*; Munakata, Koji*; Nakao, Akiko*; Hanashima, Takayasu*; Kiyanagi, Ryoji ; Ohara, Takashi  ; Hedo, Masato*; Nakama, Takao*; Onuki, Yoshichika*

Multiple transition phenomena in divalent Eu compound EuAl$$_4$$ with the tetragonal structure were investigated via single crystal time-of-flight neutron Laue technique. At 30 K below a charge-density-wave (CDW) transition, superlattice peaks emerge near nuclear Bragg peaks described by an ordering vector $$q_{rm CDW}$$ = (0 0 $${delta}_c$$). In contrast, magnetic peaks appear at $$q_2 = ({delta}_2 {delta}_2 0)$$ with $${delta}_2$$ = 0.09 below $$T_{N1}$$ = 15.4 K, and moves to $$q_1 = ({delta}_1 0 0)$$ with $${delta}_1$$ = 0.19 below $$T_{N3}$$ =12.2 K, whereas no distinct change in the magnetic Bragg peak was detected at $$T_{N2}$$ and $$T_{N4}$$. The structural modification with $$q_{rm CDW}$$ is characterized by an absence of the superlattice peak in (0 0 $$l$$). Considering an absence of splitting in magnetic peaks along $$l$$, the structural transition is mainly ascribed to a displacement of Al ions within the tetragonal $$ab$$-plane. Complex incommensurate magnetic transitions are in stark contrast to a simple collinear commensurate structure in isovalent EuGa$$_4$$. This could stem from incompatible electronic structures with the CDW transition between two compounds.

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Category:Physics, Multidisciplinary

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