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Magnetic, thermal, and electronic-transport properties of EuMg2Bi2 single crystals | | Santanu Pakhira
; M. A. Tanatar
; D. C. Johnston
; | | Date: |
8 Apr 2020 | | Abstract: | The trigonal title compound has recently been discussed in terms of its
topological band properties. These are intertwined with its magnetic
properties. Here detailed studies of the magnetic, thermal, and electronic
transport properties of single crystals are presented. The Eu{+2} spins-7/2
exhibit an antiferromagnetic (AFM) transition at a temperature TN = 6.7 K as
previously reported. By analyzing the anisotropic magnetic susceptibility chi
data below TN in terms of molecular-field theory (MFT), the AFM structure is
inferred to be a c-axis helix with a turn angle between the moments in adjacent
ordered-moment planes along the c axis of about 120 degrees. An alternate but
less likely magnetic structure is a planar structure with nearest-neighbor Eu
spins aligned at about 120 degrees with respect to each other, where these
ordered-moment layers are stacked along the c axis. The magnetic heat capacity
exhibits a lambda anomaly at TN with evidence of dynamic short-range magnetic
fluctuations both above and below TN. The high-T limit of the magnetic entropy
is close to the theoretical value for spins-7/2. The in-plane electrical
resistivity rho(T) data indicate metallic character with a mild and
disorder-sensitive upturn below T{min}=23$ K. An anomalous rapid drop on
cooling below TN as found in zero field is replaced by a two-step decrease in
magnetic fields. The rho(T) measurements also reveal an additional transition
below TN in applied fields of unknown origin that is not observed in the other
measurements and may be associated with an incommensurate to commensurate AFM
transition. The dependence of TN on the c-axis magnetic field Hperp was derived
from the field-dependent chi(T), Cp(T), and rho(T) measurements. This TN(Hperp)
was found to be consistent with the prediction of MFT for a c-axis helix with S
= 7/2 and was used to generate a phase diagram in the Hperp-T plane. | | Source: | arXiv, 2004.3753 | | Services: | Forum | Review | PDF | Favorites | |
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