Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: High-field Magnetic Torque Measurements in (CH$_3$)$_2$CHNH$_3$CuCl$_3$   High-field magnetic torque measurements were carried out in the spin gap
system (CH$_3$)$_2$CHNH$_3$CuCl$_3$. It was observed that the magnitude of the
magnetic torque $\tau$ is almost zero until the critical field and then
increases rapidly, which indicates the existence of the magnetic quantum phase
transition from the spin-gap phase to the field-induced magnetic ordered phase.
  From the temperature dependence of the magnetic torque $\tau$, the cusp-like
minimum indicative of the Bose-Einstein condensation (BEC) of magnons was
observed for $H \perp$ C-plane, while the kink-anomaly was observed for $H
\perp$ A-plane at the field-induced transition temperature. It was found that
this different behavior between $H \perp$ A-plane and $H \perp$ C-plane can be
interpreted as the breaking of the magnon BEC picture due to the rotational
symmetry breaking. The additional anomaly was also observed in the
field-induced magnetic ordered phase at the intermediate angle of the applied
magnetic field in the A-plane and discussed in terms of the spin-flop
transition, the spin-reorientation transition and the spin-lattice
correlations. In order to investigate the spin-lattice correlations in
(CH$_3$)$_2$CHNH$_3$CuCl$_3$, we performed the magnetostriction measurements
and observed that the magnetostriction appears by vanishing of the spin gap.

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The categories of this paper are: q-alg
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
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The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
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The categories of this paper are: solv-int
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The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol