Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Absence of magnetic thermal conductivity in the quantum spin liquid
  candidate YbMgGaO4   We present the ultra-low-temperature specific heat and thermal conductivity
measurements on the single crystals of YbMgGaO$_4$, which was recently argued
to be a promising candidate for quantum spin liquid (QSL). In the zero magnetic
field, a large magnetic contribution of specific heat is observed, and exhibits
a power-law temperature dependence ($C_m \sim T^{0.74}$). On the contrary, we
do not observed any significant contribution of thermal conductivity from
magnetic excitations. In magnetic fields $H \ge$ 6 T, the exponential
$T$-dependence of $C_m$ and the enhanced thermal conductivity indicate a magnon
gap of the fully-polarized state. The absence of magnetic thermal conductivity
at the zero field in this QSL candidate puts a strong constraint on the
theories of its ground state.

10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
23
The categories of this paper are: solv-int
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
36
The categories of this paper are: cmp-lg
11
The categories of this paper are: hep-lat
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics