In a research paper (Phys. Rev. B 84, 052507 (2011)), I have found the notation $H{\parallel} ab$, where $H$ is an applied magnetic field. In this context $a,b,c$ are the lattice vectors. What does this notation mean?

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    $\begingroup$ Do you understand the $H \parallel \boldsymbol{c}$ as used in the paper? Sure, they could have used $H \perp \boldsymbol{c}$ but they didn't. The crystal structure is layers along the $c$ axis, so in layer vs perpendicular to the layering makes sense. $\endgroup$
    – Jon Custer
    Jun 24 at 16:41
  • $\begingroup$ In the first mention of "fishtail effect", the authors reference this paper which uses the notation $H{\parallel}c$ and $H{\perp}c$. Given that this is for a right-angled crystal, $H{\parallel}ab$ can only be equivalent to $H{\perp}c$. $\endgroup$ Jun 25 at 13:59

The notation means H is parallel to ab.

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    $\begingroup$ This is a comment, not an answer. $\endgroup$
    – garyp
    Jun 22 at 18:03
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    $\begingroup$ While this post may be unsourced speculation, it is an answer to the question. $\endgroup$
    – rob
    Jun 23 at 1:20
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    $\begingroup$ Other users had issues the the uncertainty in how your framed your answer. I edited the language to be more certain. Please edit differently if I have misrepresented your answer. $\endgroup$ Jun 26 at 20:35
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    $\begingroup$ Meta discussion on this answer: physics.meta.stackexchange.com/q/13651/195139 $\endgroup$
    – Sandejo
    Jun 27 at 0:29

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