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Lattice Instabilities in Cuprate Superconductors: A Possible Limiting Mechanism for Tc

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Citation

Lang, M., Kürsch, R., Grauel, A., Geibel, C., Steglich, F., Rietschel, H., et al. (1992). Lattice Instabilities in Cuprate Superconductors: A Possible Limiting Mechanism for Tc. Physical Review Letters, 69(3), 482-485. doi:10.1103/PhysRevLett.69.482.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0019-D77D-A
Abstract
High-resolution thermal-expansion experiments on (i) insulating La2CuO4+delta, (ii) its Sr- and Ba-doped metallic counterparts with reduced T(c) values, and (iii) Nd(1.85)Ce0.15CuO4-delta (T(c) congruent-to 24 K) reveal distinct lattice instabilities at T1 = 32 +/- 1 K and T2 = 36 +/- 1 K. T2 coincides with T(c)max found upon 15 at.% Sr doping. For YBa2Cu3O6.5 (T(c) = 49 K), a lattice instability occurs at T = 90 +/- 1 K, i.e., again close to T(c)max = 92 K.