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High-energy, Cu spin excitations in PrBa2Cu3O6+x - art. no. 094514

PHYSICAL REVIEW B 71:9 (2005) ARTN 094514

Authors:

AT Boothroyd, NH Andersen, BH Larsen, AA Zhokhov, CD Frost, DT Adroja
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Progress in NaxCoO2 Single Crystal Growth

Chapter in Frontiers in Superconducting Materials, Springer-Verlag (2005) 683-695

Authors:

D Prabhakaran, AT Boothroyd
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Single Crystals of Bilayer Manganites

Chapter in Frontiers in Magnetic Materials, Springer-Verlag (2005) 97-115

Authors:

D Prabhakaran, AT Boothroyd
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Orbital Bi-Stripes in High Doped Bilayer Manganites

(2004)

Authors:

TAW Beale, PD Spencer, PD Hatton, SB Wilkins, M von Zimmermann, SD Brown, D Prabhakaran, AT Boothroyd
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Critical behavior of La1-xSrxMnO3 (0≤x≤0.35) by thermal diffusivity measurements

Physical Review B Condensed Matter and Materials Physics 70:18 (2004) 1-7

Authors:

A Oleaga, A Salazar, D Prabhakaran, AT Boothroyd

Abstract:

An ac photopyroelectric calorimeter has been used to measure the thermal diffusivity of the perovskite manganite family La1-xSr xMnO3 on a set of single crystals with doping range 0≤x≤0.35. Taking into account that the inverse of the thermal diffusivity has the same critical behavior as the specific heat, the critical exponent a of the magnetic transitions has been obtained. The results point to short-range interaction models for pure magnetic transitions. In the pure and lightly doped samples (x<0.10), where the transition is antiferromagnetic-paramagnetic, the critical exponent is consistent with the Heisenberg model (α=-0.11). For the highly doped samples (x>0.28), where there is a pure ferromagnetic- paramagnetic transition, the critical exponent is exactly that of an Ising behavior (α=+0.11). For 0.10≤x<0.28 no universality class was found and this behavior has been discussed taking into account the complexity of the phase diagram in this concentration range.
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