Realization of the axial next-nearest-neighbor Ising model in U3Al2Ge3

Fobes, David M.; Lin, Shi-Zeng; Ghimire, Nirmal J.; Bauer, Eric D.; Thompson, Joe D.; Bleuel, Markus; DeBeer-Schmitt, Lisa M.; Janoschek, Marc

doi:10.1103/PhysRevB.96.174413

Realization of the axial next-nearest-neighbor Ising model in $U_{3} {Al}_{2} {Ge}_{3}$

Journal Article · Thu Nov 09 00:00:00 EST 2017 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.96.174413· OSTI ID:1409774

Fobes, David M. ^[1]; Lin, Shi-Zeng ^[1]; Ghimire, Nirmal J. ^[2]; Bauer, Eric D. ^[1]; Thompson, Joe D. ^[1]; Bleuel, Markus ^[3]; DeBeer-Schmitt, Lisa M. ^[4]; Janoschek, Marc ^[1]

Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

In this paper, we report small-angle neutron scattering (SANS) measurements and theoretical modeling of

U_{3} {Al}_{2} {Ge}_{3}

. Analysis of the SANS data reveals a phase transition to sinusoidally modulated magnetic order at T_N = 63 K to be second order and a first-order phase transition to ferromagnetic order at T_c = 48 K. Within the sinusoidally modulated magnetic phase (T_c < T < T_N), we uncover a dramatic change, by a factor of 3, in the ordering wave vector as a function of temperature. Finally, these observations all indicate that

U_{3} {Al}_{2} {Ge}_{3}

is a close realization of the three-dimensional axial next-nearest-neighbor Ising model, a prototypical framework for describing commensurate to incommensurate phase transitions in frustrated magnets.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: Dept. of Commerce (United States); LANL Laboratory Directed Research and Development (LDRD) Program; National Science Foundation (NSF) (United States); USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-06CH11357; AC05-00OR22725; AC52-06NA25396

OSTI ID:: 1409774

Alternate ID(s):: OSTI ID: 1408169
OSTI ID: 1410942
OSTI ID: 1481410

Report Number(s):: LA-UR--17-24069

Journal Information:: Physical Review B, Journal Name: Physical Review B Journal Issue: 17 Vol. 96; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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