Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals
Abstract
In this study, single crystals of Ca(Co1-xIrx)2-yAs2 with 0≤x≤0.35 and 0.10≤y≤0.14 have been grown using the self-flux technique and characterized by single-crystal x-ray diffraction (XRD), energy-dispersive x-ray spectroscopy, magnetization M, and magnetic susceptibility χ measurements versus temperature T, magnetic field H, and time t, and heat-capacity Cp(H,T) measurements. The XRD refinements reveal that all the Ir-substituted crystals crystallize in a collapsed-tetragonal structure as does the parent CaCo2-yAs2 compound. A small 3.3% Ir substitution for Co in CaCo1.86As2 drastically lowers the A-type antiferromagnetic (AFM) transition temperature TN from 52 to 23 K with a significant enhancement of the Sommerfeld electronic heat-capacity coefficient. The A-type AFM structure consists of ab-plane layers of spins ferromagnetically aligned along the c axis with AFM alignment of the spins in adjacent layers along this axis. The positive Weiss temperatures obtained from Curie-Weiss fits to the χ(T>TN) data indicate that the dominant magnetic interactions are ferromagnetic (FM) for all x. A magnetic phase boundary is inferred to be present between x=0.14 and x=0.17 from a discontinuity in the x dependencies of the effective moment and Weiss temperature in the Curie-Weiss fits. FM fluctuations that strongly increase with increasing x are also revealed from the χ(T) data. Furthermore,more »
- Authors:
-
- Ames Lab., Ames, IA (United States)
- Stockholm Univ. (Sweden)
- Ames Lab., and Iowa State Univ., Ames, IA (United States)
- Publication Date:
- Research Org.:
- Ames Lab., Ames, IA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- OSTI Identifier:
- 1639043
- Report Number(s):
- IS-J-10,265
Journal ID: ISSN 2469-9950; TRN: US2201836
- Grant/Contract Number:
- AC02-07CH11358
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review B
- Additional Journal Information:
- Journal Volume: 102; Journal Issue: 2; Journal ID: ISSN 2469-9950
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Antiferromagnetism; critical field; crystal stoichiometry; crystal structure; magnetic susceptibility; magnetism; magnetization dynamics; phase diagrams; specific heat; spin glasses
Citation Formats
Pakhira, Santanu, Sangeetha, N. S., Smetana, V., Mudring, A.-V., and Johnston, D. C. Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals. United States: N. p., 2020.
Web. doi:10.1103/physrevb.102.024410.
Pakhira, Santanu, Sangeetha, N. S., Smetana, V., Mudring, A.-V., & Johnston, D. C. Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals. United States. https://doi.org/10.1103/physrevb.102.024410
Pakhira, Santanu, Sangeetha, N. S., Smetana, V., Mudring, A.-V., and Johnston, D. C. Tue .
"Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals". United States. https://doi.org/10.1103/physrevb.102.024410. https://www.osti.gov/servlets/purl/1639043.
@article{osti_1639043,
title = {Ferromagnetic cluster-glass phase in Ca(Co1-xIrx)2-yAs2 crystals},
author = {Pakhira, Santanu and Sangeetha, N. S. and Smetana, V. and Mudring, A.-V. and Johnston, D. C.},
abstractNote = {In this study, single crystals of Ca(Co1-xIrx)2-yAs2 with 0≤x≤0.35 and 0.10≤y≤0.14 have been grown using the self-flux technique and characterized by single-crystal x-ray diffraction (XRD), energy-dispersive x-ray spectroscopy, magnetization M, and magnetic susceptibility χ measurements versus temperature T, magnetic field H, and time t, and heat-capacity Cp(H,T) measurements. The XRD refinements reveal that all the Ir-substituted crystals crystallize in a collapsed-tetragonal structure as does the parent CaCo2-yAs2 compound. A small 3.3% Ir substitution for Co in CaCo1.86As2 drastically lowers the A-type antiferromagnetic (AFM) transition temperature TN from 52 to 23 K with a significant enhancement of the Sommerfeld electronic heat-capacity coefficient. The A-type AFM structure consists of ab-plane layers of spins ferromagnetically aligned along the c axis with AFM alignment of the spins in adjacent layers along this axis. The positive Weiss temperatures obtained from Curie-Weiss fits to the χ(T>TN) data indicate that the dominant magnetic interactions are ferromagnetic (FM) for all x. A magnetic phase boundary is inferred to be present between x=0.14 and x=0.17 from a discontinuity in the x dependencies of the effective moment and Weiss temperature in the Curie-Weiss fits. FM fluctuations that strongly increase with increasing x are also revealed from the χ(T) data. Furthermore, the magnetic ground state for x≥0.17 is a spin glass as indicated by hysteresis in χ(T) between field-cooled and zero-field-cooled measurements and from the relaxation of M in a small field that exhibits a stretched-exponential time dependence. The spin glass has a small FM component to the ordering and is hence inferred to be comprised of small FM clusters. The competing AFM and FM interactions along with crystallographic disorder associated with Ir substitution are inferred to be responsible for the development of a FM cluster-glass phase. A logarithmic T dependence of Cp at low T for x=0.14 is consistent with the presence of significant FM quantum fluctuations. This composition is near the T=0 boundary at x≈0.16 between the A-type AFM phase containing ferromagnetically-aligned layers of spins and the FM cluster-glass phase.},
doi = {10.1103/physrevb.102.024410},
journal = {Physical Review B},
number = 2,
volume = 102,
place = {United States},
year = {Tue Jul 07 00:00:00 EDT 2020},
month = {Tue Jul 07 00:00:00 EDT 2020}
}
Web of Science
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