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Title: Spin-phonon and magnetostriction phenomena in CaMn{sub 7}O{sub 12} helimagnet probed by Raman spectroscopy

In this letter, we investigated the temperature-dependent Raman spectra of CaMn{sub 7}O{sub 12} helimagnet from room temperature down to 10 K. The temperature dependence of the Raman mode parameters shows remarkable anomalies for both antiferromagnetic and incommensurate transitions that this compound undergoes at low temperatures. The anomalies observed at the magnetic ordering transition indicate a spin-phonon coupling at higher-temperature magnetic transition in this material, while a magnetostriction effect at the lower-temperature magnetic transition.
Authors:
 [1] ;  [2] ;  [3] ; ;  [4] ;  [5] ;  [6] ;  [3] ; ;  [6] ;  [1]
  1. Departamento de Física, Universidade Federal do Maranhão, Campus do Bacanga, 65085-580 São Luis, MA (Brazil)
  2. (Brazil)
  3. (Spain)
  4. Departamento de Física, Universidade Federal do Ceará, Campus do Pici, P.O. Box 6030, 60455-970 Fortaleza, CE (Brazil)
  5. Departamento de Química, Universidade Federal do Maranhão, Campus do Bacanga, 65085-580 São Luis, MA (Brazil)
  6. Departamento de Química Fundamental, Universidad de A Coruña, 15071 A Coruña (Spain)
Publication Date:
OSTI Identifier:
22402419
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTIFERROMAGNETISM; CALCIUM COMPOUNDS; MAGNESIUM OXIDES; MAGNETIZATION; MAGNETOSTRICTION; PHONONS; RAMAN SPECTRA; RAMAN SPECTROSCOPY; SPIN