The preferred style for undergraduate students studying Physics is Harvard.
Please check with your lecturer or unit coordinator if you are unsure.
AIP referencing is a numbered style with references numbered in the order of appearance in the article and listed in that order at the end of the article.
AIP style manual endorses the use of superscript to indicate citations within text, with numbers running sequentially throughout the article i.e. ¹,², ³.
" As valuable multifunctional materials, ferromagnetic shape memory alloys (FSMAs) have been investigated for several years. Following the discovery of magnetic-field induced strain in the Ni2MnGa alloy,¹ extensive research has been carried out with the focus on discovering new FSMAs."
J. Appl. Phys. 112, 083902 (2012); doi: 10.1063/1.4758180
In text Citation - General Rules
A recent measurement2 of rv
A recent measurement of rv 2
Reference List - General Rules
NB. Individual AIP journals allow variation to the style of Referencing, including the use of square bracket numbering (instead of superscript) and the inclusion of article titles. See the advice to authors pages and sample manuscripts in individual journals for specific journal requirements.