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Title: High-order harmonics and the reverse of the squaring up process in the triangular-lattice magnet HoPdAl4⁢Ge2

Journal Article · · Physical Review. B

We uncover high-order harmonics and the reverse of the squaring-up process, in terms of analyzing the evolution of magnetic orders in a centrosymmetric layered triangular-lattice magnet HoPdAl4⁢Ge2, based on a detailed study of the crystal structure, magnetic susceptibility, magnetization, heat capacity, and magnetic structure. Temperature dependencies of magnetic susceptibility and heat capacity show two magnetic transitions at TN = 10.5 K and Tt = 5.5 K. Below TN, Ho3+ spins order antiferromagnetically as a transverse spin-density wave with the propagation vector k1 = (001.5 – δ) with δ ≈ 0.18. Upon further cooling through Tt, the high-order harmonics with kn = (001.5 – nδ), n = 3, 5, 7 develop, suggesting a squaring-up process. It is surprising that the squaring-up process does not continue down to 0 K but reverses the trend below 3 K. Magnetic-field-induced metastable transitions were observed in M⁡(H) curves with the fields applied both parallel and perpendicular to the triangular-lattice plane. Neutron-diffraction results suggest that the magnetization process in HoPdAl4⁢Ge2 involves the conversion of kn = (001.5 – n⁢δ) with n = 1, 3, 5, 7, to a ferromagnetic kF = (000) component. It is worth noting that the already weak seventh harmonic magnetic peak is enhanced by applying a small magnetic field in the ab plane at 1.5 K or warming up to 3 K, accompanied by a slight decrease of δ.

Research Organization:
Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC05-00OR22725
OSTI ID:
2439853
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 13 Vol. 109; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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