CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order
Abstract
We report the discovery of CaMn2Al10, a metal with strong magnetic anisotropy and moderate electronic correlations. Magnetization measurements find a Curie-Weiss moment of 0.83μB/Mn, significantly reduced from the Hund's rule value, and the magnetic entropy obtained from specific heat measurements is correspondingly small, only ≈ 9% of Rln2. These results imply that the Mn magnetism is highly itinerant, a conclusion supported by density functional theory calculations that find strong Mn-Al hybridization. Consistent with the layered nature of the crystal structure, the magnetic susceptibility χ is anisotropic below 20 K, with a maximum ratio of χ[010]/χ[001] ≈ 3.5. A strong power-law divergence χ(T) ~ T–1.2 below 20 K implies incipient ferromagnetic order, an Arrott plot analysis of the magnetization suggests a vanishing low Curie temperature TC ~ 0. Our experiments indicate that CaMn2Al10 is a rare example of a system where the weak and itinerant Mn-based magnetism is poised on the verge of order.
- Authors:
-
- Brookhaven National Lab. (BNL), Upton, NY (United States); Stony Brook Univ., Stony Brook, NY (United States)
- Farmingdale State College, Farmingdale, NY (United States)
- Brookhaven National Lab. (BNL), Upton, NY (United States)
- Stony Brook Univ., Stony Brook, NY (United States)
- Publication Date:
- Research Org.:
- Brookhaven National Laboratory (BNL), Upton, NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- OSTI Identifier:
- 1226058
- Alternate Identifier(s):
- OSTI ID: 1201027
- Report Number(s):
- BNL-108463-2015-JA
Journal ID: ISSN 1098-0121; PRBMDO; R&D Project: PM009; KC0202020
- Grant/Contract Number:
- SC00112704; AC02-98CH1886; SC0012704
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review. B, Condensed Matter and Materials Physics
- Additional Journal Information:
- Journal Volume: 92; Journal Issue: 2; Journal ID: ISSN 1098-0121
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
Citation Formats
Steinke, L., Simonson, J. W., Yin, W. -G., Smith, G. J., Kistner-Morris, J. J., Zellman, S., Puri, A., and Aronson, M. C.. CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order. United States: N. p., 2015.
Web. doi:10.1103/PhysRevB.92.020413.
Steinke, L., Simonson, J. W., Yin, W. -G., Smith, G. J., Kistner-Morris, J. J., Zellman, S., Puri, A., & Aronson, M. C.. CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order. United States. https://doi.org/10.1103/PhysRevB.92.020413
Steinke, L., Simonson, J. W., Yin, W. -G., Smith, G. J., Kistner-Morris, J. J., Zellman, S., Puri, A., and Aronson, M. C.. Fri .
"CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order". United States. https://doi.org/10.1103/PhysRevB.92.020413. https://www.osti.gov/servlets/purl/1226058.
@article{osti_1226058,
title = {CaMn2Al10: Itinerant Mn magnetism on the verge of magnetic order},
author = {Steinke, L. and Simonson, J. W. and Yin, W. -G. and Smith, G. J. and Kistner-Morris, J. J. and Zellman, S. and Puri, A. and Aronson, M. C.},
abstractNote = {We report the discovery of CaMn2Al10, a metal with strong magnetic anisotropy and moderate electronic correlations. Magnetization measurements find a Curie-Weiss moment of 0.83μB/Mn, significantly reduced from the Hund's rule value, and the magnetic entropy obtained from specific heat measurements is correspondingly small, only ≈ 9% of Rln2. These results imply that the Mn magnetism is highly itinerant, a conclusion supported by density functional theory calculations that find strong Mn-Al hybridization. Consistent with the layered nature of the crystal structure, the magnetic susceptibility χ is anisotropic below 20 K, with a maximum ratio of χ[010]/χ[001] ≈ 3.5. A strong power-law divergence χ(T) ~ T–1.2 below 20 K implies incipient ferromagnetic order, an Arrott plot analysis of the magnetization suggests a vanishing low Curie temperature TC ~ 0. Our experiments indicate that CaMn2Al10 is a rare example of a system where the weak and itinerant Mn-based magnetism is poised on the verge of order.},
doi = {10.1103/PhysRevB.92.020413},
journal = {Physical Review. B, Condensed Matter and Materials Physics},
number = 2,
volume = 92,
place = {United States},
year = {Fri Jul 24 00:00:00 EDT 2015},
month = {Fri Jul 24 00:00:00 EDT 2015}
}
Web of Science
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