Charge density wave transition probed by interferometric dilatometry

1. t D. Dominkoa1, L. Ladinoab, I. Sovićac, D. Starešinića, N. Demolia, K. Biljakovića aInstitute of Physics, Bijenička 46, Zagreb, Croatia bUniversity of Kentucky, Lexington, KY USA cDepartment of Geophysics, Faculty of Science, Horvatovac bb, HR-10000 Zagreb, Croatia; 1ddominko@ifs.hr. Experimental setup Interference patterns We report on a new method of measuring sample length, based on interferometric measurements. Motivation for exploring this technique is to study the coupling between charge density wave (CDW) and underlying crystal lattice. Several papers report the dilatation measurements on CDW systems which can be related to CDW transition [1], CDW hysteresis [2], as well as low temperature glass transition [3]. Coupling with lattice is also evident from calorimetric measurements at glass transition temperature [4]. Our aim is to apply this method to other CDW systems as well as other systems with electronic superstructure. Charge density wave transition probed by interferometric dilatometry  Length change: Best resolution (theoretical): Δφ Results Previous measurements References [1] M. R. Hauser, B. B. Plapp and G. Mozurkewich, Phys. Rev. B 43, 8105, (1991) [2] A.V. Golovnya, V.Ya. Pokrovskii, and P. M. Shadrin, Phys. Rev. Lett, 88, (2002) [3] M. Tian, L. Chen and Y. Zhang, Phys. Rev. B 62, 1504 (2000) [4] D. Starešinić, A. Kiš, K. Biljaković, B. Emerling, J. W. Brill, J. Souletie, H. Berger and F. Lévy, Eur. Phys. J. B 29, 71-77 (2002) [5] T. Vuletić, B. Korin-Hamzić, T. Ivek, S. Tomić, B. Gorshunov, M. Dressel and J. Akimitsu, Phys. Rep. 428, 169-258 (2006). Fig 2. Interferometric measurements in TaS3 [2] Fig 1. Two different thermal expansion coefficients are observed in telephone number compound Sr14Cu24O41, separated by saturation regime around phase transition temperature Both measurements, with different techniques, on blue bronze and TaS3 in heating show approximately the same behavior on transition point as our measurement on telephone number compound Sr14Cu24O41. Fig 2. Capacitive dilatometry measurements on a blue bronze observed in [1]