Metamagnetic transition and magnetocaloric effect in charge-ordered Pr0.68Ca0.32-xSrxMnO3 (x=0, 0.1, 0.18, 0.26 and 0.32) compounds

KOLAT V. S., İZGİ T., KAYA A., BAYRİ N., GENÇER H., ATALAY S.

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, cilt.322, sa.4, ss.427-433, 2010 (SCI-Expanded) identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 322 Sayı: 4
  • Basım Tarihi: 2010
  • Doi Numarası: 10.1016/j.jmmm.2009.09.071
  • Dergi Adı: JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Sayfa Sayıları: ss.427-433
  • Anahtar Kelimeler: Manganites, Magnetocaloric effect, Magnetic entropy change, Metamagnetic transition, MANGANITE, MAGNETORESISTANCE, RESISTIVITY
  • İnönü Üniversitesi Adresli: Evet

Özet

In this study, magnetic and magnetocaloric properties of Pr0.68Ca0.32-xSrxMnO3 (x=0, 0.1, 0.18, 0.26 and 0.32) compounds were investigated. X-ray results indicated that all the samples have a single phase of orthorhombic symmetry. The orthorhombic unit cell parameters increase with the increase in Sr content. Large negative magnetic entropy changes (-26.2 J/kg K at 38 K and 5 T for x=0 and -6.5 J/kg K at 83 K and 6 T for x = 0.1) were attributed to ultrasharp metamagnetic transitions. The peak value of Delta S-m decreased from -4.1 J/kg K for x=0.18 sample to -2.4 J/kg K for x=0.32 at 1 T magnetic field. (C) 2009 Elsevier B.V. All rights reserved.