Magnetism and magnetocaloric effect of single-crystal Er5Si4 under pressure

N. Marcano, P. A. Algarabel, J. Rodríguez Fernández, C. Magén, L. Morellón, Niraj K. Singh, D. L. Schlagel, K. A. Gschneidner, Jr., V. K. Pecharsky, and M. R. Ibarra
Phys. Rev. B 85, 024408 – Published 11 January 2012

Abstract

Magnetic and magnetocaloric properties of single-crystalline Er5Si4 have been investigated as a function of the applied magnetic field (up to 50 kOe) and the hydrostatic pressure (up to 10 kbar) in the 5–300 K temperature range along the three main crystallographic directions. The magnetization isotherms show a highly anisotropic behavior with the easy-magnetization direction along the b axis for the low-pressure monoclinic and high-pressure orthorhombic structures, in good agreement with previous neutron scattering experiments. Below TC, the approach to the saturation shows a steplike behavior when the magnetic field is applied along the hard directions. The steps are sharper as the pressure increases. At constant magnetic field change, increasing the pressure induces a highly anisotropic enhancement of the magnetic entropy change. An enhancement of 20% is observed along the easy axis b, where the magnetic entropy change is maximum. The different evolution of the magnitude and temperature dependence of the magnetocaloric effect along the three crystallographic directions with pressure is discussed.

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  • Received 21 June 2011

DOI:https://doi.org/10.1103/PhysRevB.85.024408

©2012 American Physical Society

Authors & Affiliations

N. Marcano1,2,3, P. A. Algarabel1,2, J. Rodríguez Fernández4, C. Magén2,5,6, L. Morellón1,2,5, Niraj K. Singh7, D. L. Schlagel7, K. A. Gschneidner, Jr.7,8, V. K. Pecharsky7, and M. R. Ibarra1,2,5

  • 1Departamento Física de la Materia Condensada, Universidad de Zaragoza, ES-50009 Zaragoza, Spain
  • 2Instituto de Ciencia de Materiales de Aragón, CSIC-Universidad de Zaragoza, ES-50009 Zaragoza, Spain
  • 3Centro Universitario de la Defensa, Academia General Militar Crta. Huesca s/n, ES-50090 Zaragoza, Spain
  • 4Departamento CITIMAC, Universidad de Cantabria, ES-39005 Santander, Spain
  • 5Instituto de Nanociencia de Aragón, Universidad de Zaragoza, ES-50018 Zaragoza, Spain
  • 6Fundación ARAID, ES-50004 Zaragoza, Spain
  • 7Ames Laboratory, U. S. Department of Energy, Iowa State University, Ames, Iowa 50011-3020, USA
  • 8Department of Materials Science and Engineering, Iowa State University, Ames, Iowa, 50011-2030, USA

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Issue

Vol. 85, Iss. 2 — 1 January 2012

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