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Title: Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd{sub 2}BaNiO{sub 5}

Abstract

We report the magnetic, heat-capacity, dielectric and magnetodielectric (MDE) behaviour of a Haldane spin-chain compound containing light rare-earth ion, Nd{sub 2}BaNiO{sub 5}, in detail, as a function of temperature (T) and magnetic field (H) down to 2 K. In addition to the well-known long range antiferromagnetic order setting in at (T{sub N} = ) 48 K as indicated in dc magnetization (M), we have observed another magnetic transition near 10 K; this transition appears to be of a glassy-type which vanishes with a marginal application of external magnetic field (even H = 100 Oe). There are corresponding anomalies in dielectric constant (ε′) as well with variation of T. The isothermal M(H) curves at 2 and 5 K reveal the existence of a magnetic-field induced transition around 90 kOe; the isothermal ε′(H) also tracks such a metamagnetic transition. These results illustrate the MDE coupling in this compound. Additionally, we observe a strong frequency dependence of a step in ε′(T) with this feature appearing around 25-30 K for the lowest frequency of 1 kHz, far below T{sub N}. This is attributed to interplay between crystal-field effect and exchange interaction between Nd and Ni, which establishes the sensitivity of dielectric measurements to detectmore » such effects. Interestingly enough, the observed dispersions of the ε′(T) curves is essentially H-independent in the entire T-range of measurement, despite the existence of MDE coupling, which is in sharp contrast with other heavy rare-earth members in this series.« less

Authors:
;  [1];  [2];  [3]
  1. Tata Institute of Fundamental Research, Homi Bhabha Road, Colaba, Mumbai-400005 (India)
  2. Indian Institute of Technology Bhubaneswar, Bhubaneswar, Odisha- 171013 (India)
  3. UGC-DAE Consortium for Scientific Research, Indore Centre, Khandwa Road, Indore - 452001 (India)
Publication Date:
OSTI Identifier:
22454479
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Advances; Journal Volume: 5; Journal Issue: 3; Other Information: (c) 2015 Author(s); Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ANTIFERROMAGNETISM; COUPLING; CRYSTAL FIELD; DIAGRAMS; DIELECTRIC MATERIALS; EXCHANGE INTERACTIONS; FREQUENCY DEPENDENCE; IONS; KHZ RANGE; MAGNETIC FIELDS; MAGNETIZATION; PERMITTIVITY; RARE EARTHS; SENSITIVITY; SPECIFIC HEAT; SPIN; TEMPERATURE DEPENDENCE

Citation Formats

Basu, Tathamay, E-mail: tathamay@tifr.res.in, Sampathkumaran, E. V., E-mail: sampath@mailhost.tifr.res.in, Mohapatra, Niharika, and Singh, Kiran. Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd{sub 2}BaNiO{sub 5}. United States: N. p., 2015. Web. doi:10.1063/1.4916041.
Basu, Tathamay, E-mail: tathamay@tifr.res.in, Sampathkumaran, E. V., E-mail: sampath@mailhost.tifr.res.in, Mohapatra, Niharika, & Singh, Kiran. Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd{sub 2}BaNiO{sub 5}. United States. doi:10.1063/1.4916041.
Basu, Tathamay, E-mail: tathamay@tifr.res.in, Sampathkumaran, E. V., E-mail: sampath@mailhost.tifr.res.in, Mohapatra, Niharika, and Singh, Kiran. Sun . "Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd{sub 2}BaNiO{sub 5}". United States. doi:10.1063/1.4916041.
@article{osti_22454479,
title = {Magnetic and magnetodielectric coupling anomalies in the Haldane spin-chain system Nd{sub 2}BaNiO{sub 5}},
author = {Basu, Tathamay, E-mail: tathamay@tifr.res.in and Sampathkumaran, E. V., E-mail: sampath@mailhost.tifr.res.in and Mohapatra, Niharika and Singh, Kiran},
abstractNote = {We report the magnetic, heat-capacity, dielectric and magnetodielectric (MDE) behaviour of a Haldane spin-chain compound containing light rare-earth ion, Nd{sub 2}BaNiO{sub 5}, in detail, as a function of temperature (T) and magnetic field (H) down to 2 K. In addition to the well-known long range antiferromagnetic order setting in at (T{sub N} = ) 48 K as indicated in dc magnetization (M), we have observed another magnetic transition near 10 K; this transition appears to be of a glassy-type which vanishes with a marginal application of external magnetic field (even H = 100 Oe). There are corresponding anomalies in dielectric constant (ε′) as well with variation of T. The isothermal M(H) curves at 2 and 5 K reveal the existence of a magnetic-field induced transition around 90 kOe; the isothermal ε′(H) also tracks such a metamagnetic transition. These results illustrate the MDE coupling in this compound. Additionally, we observe a strong frequency dependence of a step in ε′(T) with this feature appearing around 25-30 K for the lowest frequency of 1 kHz, far below T{sub N}. This is attributed to interplay between crystal-field effect and exchange interaction between Nd and Ni, which establishes the sensitivity of dielectric measurements to detect such effects. Interestingly enough, the observed dispersions of the ε′(T) curves is essentially H-independent in the entire T-range of measurement, despite the existence of MDE coupling, which is in sharp contrast with other heavy rare-earth members in this series.},
doi = {10.1063/1.4916041},
journal = {AIP Advances},
number = 3,
volume = 5,
place = {United States},
year = {Sun Mar 15 00:00:00 EDT 2015},
month = {Sun Mar 15 00:00:00 EDT 2015}
}