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Magnetic and structural transitions in La$_{1-x}A_{1-x}$CoO$_{3}$ ($A$ = Ca, Sr, and Ba)

Autor: Kriener, M., Braden, M., Kierspel, H., Senff, D., Zabara, O., Zobel, C., Lorenz, T.

Publikováno v: Phys. Rev. B 79, 224104 (2009)

We report thermal-expansion, lattice-constant, and specific-heat data of the series La_1-xA_xCoO_3 for 0<= x <= 0.30 with A = Ca, Sr, and Ba. For the undoped compound LaCoO_3 the thermal-expansion coefficient alpha(T) exhibits a pronounced maximum ar

Externí odkaz: http://arxiv.org/abs/0801.4188

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Evidence for Multiple Phase Transitions in La_1-xCa_xCoO_3

Autor: Kriener, M., Braden, M., Senff, D., Zabara, O., Lorenz, T.

Publikováno v: J. Magn. Magn. Mat. 310 (2007) e187-e189

We report thermal-expansion and specific-heat data of the series La_1-xCa_xCoO_3 for 0 <= x <= 0.3. For x = 0 the thermal-expansion coefficient alpha(T) features a pronounced maximum around T = 50 K caused by a temperature-dependent spin-state transi

Externí odkaz: http://arxiv.org/abs/cond-mat/0605721

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Structure, Magnetization and Resistivity of La$_{1-x}$M$_x$CoO$_3$ (M = Ca, Sr, and Ba)

Autor: Kriener, M., Zobel, C., Reichl, A., Baier, J., Cwik, M., Berggold, K., Kierspel, H., Zabara, O., Freimuth, A., Lorenz, T.

Publikováno v: Phys. Rev. B 69, 094417 (2004)

We present an investigation of the influence of structural distortions in charge-carrier doped \lmco by substituting La$^{3+}$ with alkaline earth metals of strongly different ionic sizes, that is M = Ca$^{2+}$, Sr$^{2+}$, and Ba$^{2+}$, respectively

Externí odkaz: http://arxiv.org/abs/cond-mat/0401400

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Strong damping of phononic heat current by magnetic excitations in SrCu_2(BO_3)_2

Autor: Hofmann, M., Lorenz, T., Uhrig, G. S., Kierspel, H., Zabara, O., Freimuth, A., Kageyama, H., Ueda, Y.

Publikováno v: Phys. Rev. Lett. 87, 047202 (2001)

Measurements of the thermal conductivity as a function of temperature and magnetic field in the 2D dimer spin system SrCu$_2$(BO$_3$)$_2$ are presented. In zero magnetic field the thermal conductivity along and perpendicular to the magnetic planes sh

Externí odkaz: http://arxiv.org/abs/cond-mat/0103012

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