Incommensurate spin density wave and magnetocaloric effect in the metallic triangular lattice HoAl2Ge2

Gao，Fei1,2; Sheng，Jieming3,4; Ren，Weijun1,2; Zhang，Qiang5; Luo，Xiaohua6; Qi，Ji1,2; Cong，Mengru1,2; Li，Bing1,2; Wu，Liusuo4,7; Zhang，Zhidong1,2

2022-10-01

10.1103/PhysRevB.106.134426

Physical Review B   Impact Factor & Quartile

2469-9950

2469-9969

We report the magnetic structure and the magnetocaloric effect (MCE) of the ternary compound HoAl2Ge2 with a trigonal CaAl2Si2-type crystal structure. A neutron powder diffraction experiment reveals that HoAl2Ge2 exhibits an incommensurate spin density wave (SDW) with a propagation vector k=(0.23,0,0.06). The special arrangement of magnetic moments in HoAl2Ge2 induces interesting physical phenomena and large magnetocaloric effects. The rise in resistivity at low temperatures indicates the effect of the SDW state in the electronic transport. The maximum magnetic-entropy change is -16.1J/kgK under a magnetic field change of 0-70 kOe for an isotropic HoAl2Ge2 powder and it increases to -17.9J/kgK for a single crystal when the magnetic field (H) is applied parallel to the ab plane. A large rotating magnetic-entropy change of -5.1J/kgK for H=20kOe in a HoAl2Ge2 single crystal is obtained, which is closely associated to the magnetic anisotropy of the SDW order and its response to the external magnetic field. We discuss the large MCE in terms of the field-induced metamagnetic transition from the incommensurate SDW order to the ferromagnetic order. Our study establishes the triangular lattice RAl2Ge2 (R = rare-earth elements) as a unique family of compounds to explore the existence of the incommensurate spin density waves and the correlated physical properties.

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1.Shenyang National Laboratory for Materials Science,Institute of Metal Research,Chinese Academy of Sciences,Shenyang,72 Wenhua Road,110016,China
2.School of Materials Science and Engineering,University of Science and Technology of China,Shenyang,110016,China
3.Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
5.Neutron Science Division,Oak Ridge National Laboratory,Oak Ridge,37831,United States
6.Jiangxi Key Laboratory for Rare Earth Magnetic Materials and Devices,College of Rare Earths,Jiangxi University of Science and Technology,Ganzhou,341000,China
7.Shenzhen Key Laboratory of Advanced Quantum Functional Materials and Devices,Southern University of Science and Technology,Shenzhen,518055,China

Gao，Fei,Sheng，Jieming,Ren，Weijun,et al. Incommensurate spin density wave and magnetocaloric effect in the metallic triangular lattice HoAl2Ge2[J]. Physical Review B,2022,106(13).

Gao，Fei.,Sheng，Jieming.,Ren，Weijun.,Zhang，Qiang.,Luo，Xiaohua.,...&Zhang，Zhidong.(2022).Incommensurate spin density wave and magnetocaloric effect in the metallic triangular lattice HoAl2Ge2.Physical Review B,106(13).

Gao，Fei,et al."Incommensurate spin density wave and magnetocaloric effect in the metallic triangular lattice HoAl2Ge2".Physical Review B 106.13(2022).