Universal superconducting and magnetic properties of the (CaLa)(BaLa)CuO system: a MuSR investigation

Abstract

The (Ca_xLa_(1-x))(Ba_(1.75-x)La_(0.25+x))Cu_(3)O_(y) system is ideal for testing theories of high temperature superconductivity, since nearly the full range of doping is controlled by y, and T_(c)^max is continuously controlled by x, with minimal structural changes. We investigate this system with both transverse and longitudinal field MuSR. This allows us to re-examine the Uemura relation, the nature of the spontaneous magnetic fields below T_(c), and the relation between their appearance temperature T_(g) and T_(c)^max . Our major findings are: (I) the Uemura relation is respected by CLBLCO more adequately than by other cuprates, (II) T_(g) and T_(c) are controlled by the same energy scale, (III) the phase separation between hole poor and hole rich regions is a microscopic one, and (IV) spontaneous magnetic fields appear gradually with no moment size evolution.

References in corpus (6)

• Imaging the Effects of Individual Zinc Impurity Atoms on Superconductivity in Bi2Sr2CaCu2O8+delta
• Cu NMR evidence for enhanced antiferromagnetic correlations around Zn impurities in YBa2Cu3O6.7
• Plaquette Boson-Fermion Model of Cuprates
• Muon spin relaxation studies of incommensurate magnetism and superconductivity in stage-4 La${}_2$CuO${}_{4.11}$ and La${}_{1.88}$Sr${}_{0.12}$CuO${}_4$
• Common energy scale for magnetism and superconductivity in underdoped cuprates: a MuSR investigation of (CaLa)(BaLa)CuO
• The Structure and a Bond-Valence-Sum Study of the 1-2-3 Superconductors CLBLCO and YBCO

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