Scaling of Memories and Crossover in Glassy Magnets

A. M. Samarakoon; M. Takahashi; D. Zhang; J. Yang; N. Katayama; R. Sinclair; H. D. Zhou; S. O. Diallo; G. Ehlers; D. A. Tennant; S. Wakimoto; K. Yamada; G. W. Chern; T. J. Sato; S. H. Lee

doi:10.1038/s41598-017-12187-9

Scaling of Memories and Crossover in Glassy Magnets

A. M. Samarakoon, M. Takahashi, D. Zhang, J. Yang, N. Katayama, R. Sinclair, H. D. Zhou, S. O. Diallo, G. Ehlers, D. A. Tennant, S. Wakimoto, K. Yamada, G. W. Chern, T. J. Sato, S. H. Lee

Neutron Instrument Technologies

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9 Scopus citations

Abstract

Glassiness is ubiquitous and diverse in characteristics in nature. Understanding their differences and classification remains a major scientific challenge. Here, we show that scaling of magnetic memories with time can be used to classify magnetic glassy materials into two distinct classes. The systems studied are high temperature superconductor-related materials, spin-orbit Mott insulators, frustrated magnets, and dilute magnetic alloys. Our bulk magnetization measurements reveal that most densely populated magnets exhibit similar memory behavior characterized by a relaxation exponent of 1-n\approx 0.6(1) 1 - n ≈ 0.6 (1). This exponent is different from 1-\boldsymbol\approx 1/3 1 - n ≈ 1 / 3 of dilute magnetic alloys that was ascribed to their hierarchical and fractal energy landscape, and is also different from 1-\boldsymbol=1 1 - n = 1 of the conventional Debye relaxation expected for a spin solid, a state with long range order. Furthermore, our systematic study on dilute magnetic alloys with varying magnetic concentration exhibits crossovers among the two glassy states and spin solid.

Original language	English
Article number	12053
Journal	Scientific Reports
Volume	7
Issue number	1
DOIs	https://doi.org/10.1038/s41598-017-12187-9
State	Published - Dec 1 2017

Funding

Work at University of Virginia by S.H.L. and A.S. was supported by US National Science Foundation (NSF) Grant DMR-1404994 and Oak Ridge National Laboratory, respectively. The work at Tohoku University was partly supported by Grants-in-Aid for Scientific Research (24224009, 23244068, and 15H05883) from MEXT of Japan. The work at University of Tennessee was supported by the US National Science Foundation (NSF) grant DMR-1350002.

Funders	Funder number
US National Science Foundation
National Science Foundation	DMR-1404994
National Science Foundation
Directorate for Mathematical and Physical Sciences	1404994, 1350002
Directorate for Mathematical and Physical Sciences
Oak Ridge National Laboratory	23244068, 15H05883, 24224009
Oak Ridge National Laboratory
University of Tennessee	DMR-1350002
University of Tennessee
University of Virginia
Japan Society for the Promotion of Science	17K18744
Japan Society for the Promotion of Science
Ministry of Education, Culture, Sports, Science and Technology

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abstract = "Glassiness is ubiquitous and diverse in characteristics in nature. Understanding their differences and classification remains a major scientific challenge. Here, we show that scaling of magnetic memories with time can be used to classify magnetic glassy materials into two distinct classes. The systems studied are high temperature superconductor-related materials, spin-orbit Mott insulators, frustrated magnets, and dilute magnetic alloys. Our bulk magnetization measurements reveal that most densely populated magnets exhibit similar memory behavior characterized by a relaxation exponent of 1-n\approx 0.6(1) 1 - n ≈ 0.6 (1). This exponent is different from 1-\boldsymbol\approx 1/3 1 - n ≈ 1 / 3 of dilute magnetic alloys that was ascribed to their hierarchical and fractal energy landscape, and is also different from 1-\boldsymbol=1 1 - n = 1 of the conventional Debye relaxation expected for a spin solid, a state with long range order. Furthermore, our systematic study on dilute magnetic alloys with varying magnetic concentration exhibits crossovers among the two glassy states and spin solid.",

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AU - Ehlers, G.

AU - Tennant, D. A.

AU - Wakimoto, S.

AU - Yamada, K.

AU - Chern, G. W.

AU - Sato, T. J.

AU - Lee, S. H.

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N2 - Glassiness is ubiquitous and diverse in characteristics in nature. Understanding their differences and classification remains a major scientific challenge. Here, we show that scaling of magnetic memories with time can be used to classify magnetic glassy materials into two distinct classes. The systems studied are high temperature superconductor-related materials, spin-orbit Mott insulators, frustrated magnets, and dilute magnetic alloys. Our bulk magnetization measurements reveal that most densely populated magnets exhibit similar memory behavior characterized by a relaxation exponent of 1-n\approx 0.6(1) 1 - n ≈ 0.6 (1). This exponent is different from 1-\boldsymbol\approx 1/3 1 - n ≈ 1 / 3 of dilute magnetic alloys that was ascribed to their hierarchical and fractal energy landscape, and is also different from 1-\boldsymbol=1 1 - n = 1 of the conventional Debye relaxation expected for a spin solid, a state with long range order. Furthermore, our systematic study on dilute magnetic alloys with varying magnetic concentration exhibits crossovers among the two glassy states and spin solid.

AB - Glassiness is ubiquitous and diverse in characteristics in nature. Understanding their differences and classification remains a major scientific challenge. Here, we show that scaling of magnetic memories with time can be used to classify magnetic glassy materials into two distinct classes. The systems studied are high temperature superconductor-related materials, spin-orbit Mott insulators, frustrated magnets, and dilute magnetic alloys. Our bulk magnetization measurements reveal that most densely populated magnets exhibit similar memory behavior characterized by a relaxation exponent of 1-n\approx 0.6(1) 1 - n ≈ 0.6 (1). This exponent is different from 1-\boldsymbol\approx 1/3 1 - n ≈ 1 / 3 of dilute magnetic alloys that was ascribed to their hierarchical and fractal energy landscape, and is also different from 1-\boldsymbol=1 1 - n = 1 of the conventional Debye relaxation expected for a spin solid, a state with long range order. Furthermore, our systematic study on dilute magnetic alloys with varying magnetic concentration exhibits crossovers among the two glassy states and spin solid.

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Scaling of Memories and Crossover in Glassy Magnets

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