Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Josephson Plasma Resonance in Solid and Glass Phases of
  Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$   Vortex matter phases and phase transitions are investigated by means of
Josephson plasma resonance in under-doped Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$
single crystals in a microwave frequency range between 19 and 70 GHz.
Accompanied by the vortex lattice melting transition, a jump of the interlayer
phase coherence extracted from the field dependence of the plasma frequency was
observed. In the solid phase, the interlayer coherence little depends on field
at a temperature region well below $T_c$ while it gradually decreases as field
increases toward the melting line up to just below $T_c$. As a result, the
magnitude of the jump decreases with increasing temperature and is gradually
lost in the vicinity of $T_c$. This indicates that the vortex lines formed in
the vortex solid phase are thermally meandering and the phase transition
becomes weak especially just below $T_c$.

16
The categories of this paper are: stat
0
The categories of this paper are: hep-ph
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
30
The categories of this paper are: q-alg
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
19
The categories of this paper are: eess
25
The categories of this paper are: patt-sol
31
The categories of this paper are: ao-sci
7
The categories of this paper are: hep-th