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Symmetry is a basic paradigm for analysis of problems in solid state physics,and to controllably break point-group symmetries is a powerful probe of novelforms of order. In this work, we apply two methods, controlled lattice strainand vector magnetic field, to study a well-known correlated electron phase thatappears at low temperatures in the layered material Sr3Ru2O7. This phaseresponds strongly to C4-symmetry-breaking fields, suggesting spontaneous C4symmetry breaking. However, in this work we find that the data are more easilyexplained with microscopic coexistence of two orthogonal order parametercomponents than spontaneous symmetry breaking. The techniques presented in thiswork will be relevant for other systems where spontaneous C4 symmetry breakingis suspected.

Strain and Vector-Magnetic-Field Tuning of the Anomalous Phase in Sr3Ru2O7