First-order antiferromagnetic transitions of SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices

N. S. Sangeetha; Santanu Pakhira; Qing Ping Ding; Lennard Krause; Hyung Cheol Lee; Volodymyr Smetana; Anja Verena Mudring; Bo Brummerstedt Iversen; Yuji Furukawa; David C. Johnston

doi:10.1073/pnas.2108724118

First-order antiferromagnetic transitions of SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices

N. S. Sangeetha, Santanu Pakhira, Qing Ping Ding, Lennard Krause, Hyung Cheol Lee, Volodymyr Smetana, Anja Verena Mudring, Bo Brummerstedt Iversen, Yuji Furukawa, David C. Johnston^*

^*Corresponding author for this work

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

Abstract

SrMn2P2 and CaMn2P2 are insulators that adopt the trigonal CaAl2Si2-type structure containing corrugated Mn honeycomb layers. Magnetic susceptibility X and heat capacity versus temperature T data reveal a weak first-order antiferromagnetic (AFM) transition at the Néel temperature TN = 53(1) K for SrMn2P2 and a strong first-order AFM transition at TN = 69.8(3) K for CaMn2P2. Both compounds exhibit isotropic and nearly T-independent X(T ≤ TN), suggesting magnetic structures in which nearestneighbor moments are aligned at ≈120° to each other. The 31P NMR measurements confirm the strong first-order transition in CaMn2P2 but show critical slowing down above TN for SrMn2P2, thus also evidencing second-order character. The 31P NMR measurements indicate that the AFM structure of CaMn2P2 is commensurate with the lattice whereas that of SrMn2P2 is incommensurate. These first-order AFM transitions are unique among the class of (Ca, Sr, Ba)Mn2 (P, As, Sb, Bi)2 compounds that otherwise exhibit second-order AFM transitions. This result challenges our understanding of the circumstances under which first-order AFM transitions occur.

Original language	English
Article number	e2108724118
Journal	Proceedings of the National Academy of Sciences
Volume	118
Issue	44
Number of pages	8
ISSN	0027-8424
DOIs	https://doi.org/10.1073/pnas.2108724118
Publication status	Published - Nov 2021

Keywords

CaMn2P2
First-order antiferromagnetic transitions
Incommensurate and commensurate antiferromagnetic structures
SrMn2P2
Trigonal CaAl2Si2 structure
incommensurate and commensurate antiferromagnetic structures
RELAXATION
4-COMPONENT VECTOR MODELS
first-order antiferromagnetic transitions
PHYSICAL REALIZATIONS
MAGNETISM
PARAMAGNETIC TRANSITION
trigonal CaAl2Si2 structure
PHASE-TRANSITION
CAAL2SI2 STRUCTURE

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10.1073/pnas.2108724118

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8612238/pdf/pnas.202108724.pdf

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Sangeetha, N. S., Pakhira, S., Ding, Q. P., Krause, L., Lee, H. C., Smetana, V., Mudring, A. V., Iversen, B. B., Furukawa, Y., & Johnston, D. C. (2021). First-order antiferromagnetic transitions of SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices. Proceedings of the National Academy of Sciences, 118(44), Article e2108724118. https://doi.org/10.1073/pnas.2108724118

@article{5f5ca19b6b004e7bb94a673a24d4c56d,

title = "First-order antiferromagnetic transitions of SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices",

abstract = "SrMn2P2 and CaMn2P2 are insulators that adopt the trigonal CaAl2Si2-type structure containing corrugated Mn honeycomb layers. Magnetic susceptibility X and heat capacity versus temperature T data reveal a weak first-order antiferromagnetic (AFM) transition at the N{\'e}el temperature TN = 53(1) K for SrMn2P2 and a strong first-order AFM transition at TN = 69.8(3) K for CaMn2P2. Both compounds exhibit isotropic and nearly T-independent X(T ≤ TN), suggesting magnetic structures in which nearestneighbor moments are aligned at ≈120° to each other. The 31P NMR measurements confirm the strong first-order transition in CaMn2P2 but show critical slowing down above TN for SrMn2P2, thus also evidencing second-order character. The 31P NMR measurements indicate that the AFM structure of CaMn2P2 is commensurate with the lattice whereas that of SrMn2P2 is incommensurate. These first-order AFM transitions are unique among the class of (Ca, Sr, Ba)Mn2 (P, As, Sb, Bi)2 compounds that otherwise exhibit second-order AFM transitions. This result challenges our understanding of the circumstances under which first-order AFM transitions occur.",

keywords = "CaMn2P2, First-order antiferromagnetic transitions, Incommensurate and commensurate antiferromagnetic structures, SrMn2P2, Trigonal CaAl2Si2 structure, incommensurate and commensurate antiferromagnetic structures, RELAXATION, 4-COMPONENT VECTOR MODELS, first-order antiferromagnetic transitions, PHYSICAL REALIZATIONS, MAGNETISM, PARAMAGNETIC TRANSITION, trigonal CaAl2Si2 structure, PHASE-TRANSITION, CAAL2SI2 STRUCTURE",

author = "Sangeetha, {N. S.} and Santanu Pakhira and Ding, {Qing Ping} and Lennard Krause and Lee, {Hyung Cheol} and Volodymyr Smetana and Mudring, {Anja Verena} and Iversen, {Bo Brummerstedt} and Yuji Furukawa and Johnston, {David C.}",

year = "2021",

month = nov,

doi = "10.1073/pnas.2108724118",

language = "English",

volume = "118",

journal = "Proceedings of the National Academy of Sciences",

issn = "0027-8424",

publisher = "The National Academy of Sciences of the United States of America",

number = "44",

}

Sangeetha, NS, Pakhira, S, Ding, QP, Krause, L, Lee, HC, Smetana, V, Mudring, AV , Iversen, BB, Furukawa, Y & Johnston, DC 2021, 'First-order antiferromagnetic transitions of SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices', Proceedings of the National Academy of Sciences, vol. 118, no. 44, e2108724118. https://doi.org/10.1073/pnas.2108724118

First-order antiferromagnetic transitions of SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices. / Sangeetha, N. S.; Pakhira, Santanu; Ding, Qing Ping et al.
In: Proceedings of the National Academy of Sciences, Vol. 118, No. 44, e2108724118, 11.2021.

Research output: Contribution to journal/Conference contribution in journal/Contribution to newspaper › Journal article › Research › peer-review

TY - JOUR

T1 - First-order antiferromagnetic transitions of SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices

AU - Sangeetha, N. S.

AU - Pakhira, Santanu

AU - Ding, Qing Ping

AU - Krause, Lennard

AU - Lee, Hyung Cheol

AU - Smetana, Volodymyr

AU - Mudring, Anja Verena

AU - Iversen, Bo Brummerstedt

AU - Furukawa, Yuji

AU - Johnston, David C.

PY - 2021/11

Y1 - 2021/11

N2 - SrMn2P2 and CaMn2P2 are insulators that adopt the trigonal CaAl2Si2-type structure containing corrugated Mn honeycomb layers. Magnetic susceptibility X and heat capacity versus temperature T data reveal a weak first-order antiferromagnetic (AFM) transition at the Néel temperature TN = 53(1) K for SrMn2P2 and a strong first-order AFM transition at TN = 69.8(3) K for CaMn2P2. Both compounds exhibit isotropic and nearly T-independent X(T ≤ TN), suggesting magnetic structures in which nearestneighbor moments are aligned at ≈120° to each other. The 31P NMR measurements confirm the strong first-order transition in CaMn2P2 but show critical slowing down above TN for SrMn2P2, thus also evidencing second-order character. The 31P NMR measurements indicate that the AFM structure of CaMn2P2 is commensurate with the lattice whereas that of SrMn2P2 is incommensurate. These first-order AFM transitions are unique among the class of (Ca, Sr, Ba)Mn2 (P, As, Sb, Bi)2 compounds that otherwise exhibit second-order AFM transitions. This result challenges our understanding of the circumstances under which first-order AFM transitions occur.

AB - SrMn2P2 and CaMn2P2 are insulators that adopt the trigonal CaAl2Si2-type structure containing corrugated Mn honeycomb layers. Magnetic susceptibility X and heat capacity versus temperature T data reveal a weak first-order antiferromagnetic (AFM) transition at the Néel temperature TN = 53(1) K for SrMn2P2 and a strong first-order AFM transition at TN = 69.8(3) K for CaMn2P2. Both compounds exhibit isotropic and nearly T-independent X(T ≤ TN), suggesting magnetic structures in which nearestneighbor moments are aligned at ≈120° to each other. The 31P NMR measurements confirm the strong first-order transition in CaMn2P2 but show critical slowing down above TN for SrMn2P2, thus also evidencing second-order character. The 31P NMR measurements indicate that the AFM structure of CaMn2P2 is commensurate with the lattice whereas that of SrMn2P2 is incommensurate. These first-order AFM transitions are unique among the class of (Ca, Sr, Ba)Mn2 (P, As, Sb, Bi)2 compounds that otherwise exhibit second-order AFM transitions. This result challenges our understanding of the circumstances under which first-order AFM transitions occur.

KW - CaMn2P2

KW - First-order antiferromagnetic transitions

KW - Incommensurate and commensurate antiferromagnetic structures

KW - SrMn2P2

KW - Trigonal CaAl2Si2 structure

KW - incommensurate and commensurate antiferromagnetic structures

KW - RELAXATION

KW - 4-COMPONENT VECTOR MODELS

KW - first-order antiferromagnetic transitions

KW - PHYSICAL REALIZATIONS

KW - MAGNETISM

KW - PARAMAGNETIC TRANSITION

KW - trigonal CaAl2Si2 structure

KW - PHASE-TRANSITION

KW - CAAL2SI2 STRUCTURE

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U2 - 10.1073/pnas.2108724118

DO - 10.1073/pnas.2108724118

M3 - Journal article

C2 - 34711680

AN - SCOPUS:85118209424

SN - 0027-8424

VL - 118

JO - Proceedings of the National Academy of Sciences

JF - Proceedings of the National Academy of Sciences

IS - 44

M1 - e2108724118

ER -

First-order antiferromagnetic transitions of SrMn2P2 and CaMn2P2 single crystals containing corrugated-honeycomb Mn sublattices

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Keywords

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