First-Order Type Effects in YBa$_2$Cu$_3$O$_{6+x}$ at the Onset of Superconductivity

We present results of Raman scattering experiments on tetragonal ${\rm (Y_{1-y}Ca_{y})Ba_{2}Cu_{3}O_{6+x}} $f o r d o p i n g l e v e l s$ p(x,y)$ between 0 and 0.07 holes/CuO $_{2}$ . Below the onset of superconductivity at $p_{\rm sc1} \approx 0.06 $, w e f i n d e v i d e n c e o f a d i a g o n a l s u p e r s t r u c t u r e . A t$ p_{\rm sc1}$, lattice and electron dynamics change discontinuously with the charge and spin properties being renormalized at all energy scales. The results indicate that charge ordering is intimately related to the transition at $p_{s c 1}$ and that the maximal transition temperature to superconductivity at optimal doping $T_{c}^{m a x}$ depends on the type of ordering at $p > p_{s c 1}$ .

First-Order Type Effects in YBa $_{2}$ Cu $_{3}$ O $_{6 + x}$ at the Onset of Superconductivity

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First-Order Type Effects in YBa $_{2}$ Cu $_{3}$ O $_{6 + x}$ at the Onset of Superconductivity

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First-Order Type Effects in YBa22​Cu33​O6+x6+x​ at the Onset of Superconductivity

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First-Order Type Effects in YBa22​Cu33​O6+x6+x​ at the Onset of Superconductivity

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First-Order Type Effects in YBa $_{2}$ Cu $_{3}$ O $_{6 + x}$ at the Onset of Superconductivity

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First-Order Type Effects in YBa $_{2}$ Cu $_{3}$ O $_{6 + x}$ at the Onset of Superconductivity

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