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Modulated magnetism and anomalous electronic transport in $
m Ce_3Cu_4As_4O_2$ | | Jiakui K. Wang
; Shan Wu
; Yiming Qiu
; Jose A. Rodriguez-Rivera
; Qingzhen Huang
; C. Broholm
; E. Morosan
; | | Date: |
15 Jun 2016 | | Abstract: | The complex magnetism and transport properties of tetragonal
Ce$_3$Cu$_4$As$_4$O$_2$ were examined through neutron scattering and physical
properties measurements on polycrystalline samples. The lamellar structure
consists of alternating layers of $
m CeCu_4As_4$ with a single square Ce
lattice and oxygen-linked Ce bi-layer $
m Ce_2O_2$. Extending along $f c$, a
tube-like Fermi surface from DFT calculations points to a quasi-two-dimensional
electronic system. Peaks in the specific heat at the Ne’{e}l temperature
$T_{N}=24$ $
m K$, $T_{2}~=~16 $ $
m K$ and $T_{3}~=~1.9$ $
m K$ indicate
three magnetic phase transitions or distinct cross-over phenomena. For
$T<T_{N}$ neutron diffraction indicates the development of ferromagnetic ab
sheets for both Ce sites, with alternating polarization along $f{c}$, a wave
vector ${f k}_{1}={f c}^*$. For $T<T_{2}$, quasi-two-dimensional low-energy
spin fluctuations with ${f k}_{2}=frac{1}{2}{f a}^*$ and polarized
perpendicular to ${f k}_{2}$ are suppressed. The data are consistent with
quasi-two-dimensional antiferromagnetic order in the $
m CeCu_4As_4$ planes
polarized along the ${f k}_{2}$ wave vector. $T_{3}$ marks a spin-flop
transition where the ${f k}_{1}$ staggered magnetization switches to in-plane
polarization. While the narrow 4f bands lie deep below the Fermi surface, there
are significant transport anomalies associated with the transitions; in
particular a substantial reduction in resistivity for $T<T_{N}$. At $T=100$ $
m mK$ the ${f k}_1$ modulated staggered moment is $0.85~mu_B$, which
matches the $0.8~mu_B$ saturation magnetization achieved for H $~=~7$ $
m T$
at $T~=~2$ $
m K$. From low T Lorentzian fits the correlation length is in
excess of 75 AA. We argue the unusual sequence of magnetic transitions results
from competing interactions and anisotropies for the two Ce sites. | | Source: | arXiv, 1606.4937 | | Services: | Forum | Review | PDF | Favorites | |
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