Ultrafast dynamics in the presence of antiferromagnetic correlations in electron-doped cuprate La2−x_{2-x}Cex_xCuO4±δ_{4\pm\delta}

We used femtosecond optical pump-probe spectroscopy to study the photoinduced change in reflectivity of thin films of the electron-doped cuprate La$_{2-x}$Ce$_x$CuO$_4$ (LCCO) with dopings of x$=$0.08 (underdoped) and x$=$0.11 (optimally doped). Above T$_c$, we observe fluence-dependent relaxation rates which onset at a similar temperature that transport measurements first see signatures of antiferromagnetic correlations. Upon suppressing superconductivity with a magnetic field, it is found that the fluence and temperature dependence of relaxation rates is consistent with bimolecular recombination of electrons and holes across a gap (2$\Delta_{AF}$) originating from antiferromagnetic correlations which comprise the pseudogap in electron-doped cuprates. This can be used to learn about coupling between electrons and high-energy ($\omega>2\Delta_{AF}$) excitations in these compounds and set limits on the timescales on which antiferromagnetic correlations are static

First-Time Attendee: How to Get the Most Out of Being a Student at a Music Library Association Meeting in Careers in Music Libraries IV

While grappling with gaining education and experience to enter into a career in music libraries, students may find attendance at an MLA meeting to be particularly beneficial. Going to an MLA meeting as a student is a fantastic experience that facilitates a better understanding of the profession and creates the opportunity to make connections that can lead to greater success when entering a career in music libraries. From plenary presentations to informal gatherings, there are numerous opportunities to immerse yourself and learn about salient topics in music library work while also meeting potential collaborators, mentors, and future colleagues. In this new chapter, Taylor Greene and Zoua Sylvia Yang draw upon their experience attending national and regional MLA conferences as former student attendees and current music librarians. They provide guidance to help future music librarians and first-time attendees figure out what to expect from MLA national and local chapter meetings and to understand the importance of networking, with tips on doing it (even if you don’t want to!). They also provide advice for getting the most out of your MLA experience and pivoting from the conference to the job market

Toward the M(F)--Theory Embedding of Realistic Free-Fermion Models

We construct a Landau-Ginzburg model with the same data and symmetries as a $Z_2\times Z_2$ orbifold that corresponds to a class of realistic free-fermion models. Within the class of interest, we show that this orbifolding connects between different $Z_2\times Z_2$ orbifold models and commutes with the mirror symmetry. Our work suggests that duality symmetries previously discussed in the context of specific $M$ and $F$ theory compactifications may be extended to the special $Z_2\times Z_2$ orbifold that characterizes realistic free-fermion models.Comment: 15 pages. Standard Late

Epilogue: Superconducting Materials Past, Present and Future

Experimental contributors to the field of Superconducting Materials share their informal views on the subject.Comment: Epilogue to Physica C Special Issue on Superconducting Materials, Volume 514 (2015