Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Twisted double-layer chiral spin structures in anti-ferromagnetic
  delafossite PdCrO$_2$   We predict that the anti-ferromagnetic (AFM) magnetic structure of
delafossite PdCrO$_2$ has a staggered chirality with the double-layer
periodicity along the $z$-axis with intriguing magnetic anisotropy. We study
the electronic and magnetic structures of PdCrO$_2$ by carrying out density
functional theory (DFT) calculation. The calculated ground state turns out to
exhibit a 120$^\circ$ AFM ordering with staggered chirality. The result is
consistent with the previous neutron experiments, but our calculations
determine and provide more detailed information on the high symmetric
easy-plane and local-easy-axis structure. We investigate the origin of
staggered chirality as well as the easy-plane and local-easy-axis directions.
Based on the DFT and effective spin interaction models, we demonstrate the
complex magnetic ordering requires novel four-spin interactions, which cannot
be described by the usual exchange interaction. Also, we show Pd electronic
bands near the Fermi level pose a tiny degeneracy breaking, which arises from
the magnetic anisotropy with different easy-plane and local-easy-axis. We
expect that the twisting and rotating modes of easy-planes in the magnetic
double layers can be the critical factor to understand a hidden magnetic
property of PdCrO$_2$ and its related macroscopic property like the previously
reported anomalous Hall effect.

22
The categories of this paper are: chao-dyn
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
31
The categories of this paper are: ao-sci
25
The categories of this paper are: patt-sol
34
The categories of this paper are: chem-ph
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
14
The categories of this paper are: math-ph
3
The categories of this paper are: physics
6
The categories of this paper are: astro-ph
0
The categories of this paper are: hep-ph
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
8
The categories of this paper are: hep-ex