First-order antiferromagnetic transitions of SrMn 2 P 2 and CaMn 2 P 2 single crystals containing corrugated-honeycomb Mn sublattices
- Ames Laboratory, Iowa State University, Ames, IA 50011,
- Ames Laboratory, Iowa State University, Ames, IA 50011,, Department of Physics and Astronomy, Iowa State University, Ames, IA 50011,
- Center for Materials Crystallography, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark,, iNANO, Aarhus University, DK-8000 Aarhus C, Denmark,
- Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
- Center for Materials Crystallography, Department of Chemistry, Aarhus University, DK-8000 Aarhus C, Denmark,, iNANO, Aarhus University, DK-8000 Aarhus C, Denmark,, Department of Materials and Environmental Chemistry, Stockholm University, 106 91 Stockholm, Sweden
Significance With rare exceptions, an antiferromagnetic (AFM) transition in zero magnetic field is thermodynamically of second order where the thermal-average magnetic moments of the magnetic atoms (ordered moments) vary continuously on cooling through the AFM ordering temperature with no latent heat at the transition. Such materials include the AFM pnictides CaMn 2 As 2 , SrMn 2 As 2 , CaMn 2 Sb 2 , SrMn 2 Sb 2 , and CaMn 2 Bi 2 . Here we demonstrate that the closely related SrMn 2 P 2 and CaMn 2 P 2 insulators instead exhibit first-order AFM transitions at and 70 K, respectively, where the heat capacity exhibits a latent heat at . The mechanism causing these first-order transitions remains to be explained, but its understanding may lead to the development of novel magnetic materials of technological interest.
- Research Organization:
- Ames Laboratory (AMES), Ames, IA (United States)
- Sponsoring Organization:
- USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division
- Grant/Contract Number:
- AC02-07CH11358
- OSTI ID:
- 1828092
- Alternate ID(s):
- OSTI ID: 1833055
- Report Number(s):
- IS-J-10,632; e2108724118
- Journal Information:
- Proceedings of the National Academy of Sciences of the United States of America, Journal Name: Proceedings of the National Academy of Sciences of the United States of America Vol. 118 Journal Issue: 44; ISSN 0027-8424
- Publisher:
- Proceedings of the National Academy of SciencesCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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