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B-Site Disorder and Spin States Driven Multiple-Magnetic Phases: Griffiths Phase, Re-Entrant Cluster Glass and Exchange Bias in Pr 2CoFeO 6

25 Pages Posted: 8 Jan 2019 First Look: Under Review

See all articles by Arkadeb Pal

Arkadeb Pal

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

Prajyoti Singh

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

Shiv Kumar

Hiroshima University - Hiroshima Synchrotron Radiation Centre

V.K. Gangwar

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

Surajit Ghosh

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

S. K. Saha

S.N. Bose National Centre for Basic Sciences

P. Prakash

Bhaba Atomic Research Centre - Solid State Physics Division

Eike F. Schwier

Hiroshima University - Hiroshima Synchrotron Radiation Centre

M. Sawada

Hiroshima University - Hiroshima Synchrotron Radiation Centre

K. Shimada

Hiroshima University - Hiroshima Synchrotron Radiation Centre

Amitabh Das

Bhaba Atomic Research Centre - Solid State Physics Division; Indira Gandhi Center for Atomic Research (IGCAR) - Homi Bhabha National Institute

Manoranjan Kumar

S.N. Bose National Centre for Basic Sciences

A. K. Ghosh

Banaras Hindu University (BHU)

Sandip Chatterjee

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

Abstract

The magnetic spin ordering and the magnetization dynamics of a double perovskite Pr2CoFeO6 have been investigated by employing the (dc and ac) magnetization, neutron powder diffraction (NPD) and X-ray magnetic circular dichroism (XMCD) techniques. Structural study revealed that Pr2CoFeO6 adopts a B-site disordered orthorhombic structure (Pnma). Furthermore, ab initio band structure calculations suggested an insulating anti-ferromagnetic ground state. Magnetization measurements revealed the system to possess a spectrum of competing magnetic phases viz., long range antiferromagnetic (canted) spin ordering (TN ~269 K), Griffiths phase, re-entrant cluster glass (RCG) (TG ~34 K) and exchange bias effects. The Neutron diffraction divulged the exhibition of a long range canted G-type spin ordering by Fe spins. Moreover, the electronic structure probed by the X-ray absorption spectroscopy (XAS) study suggested a nominal valance state of +3 for both the B-site ions (Co/Fe). The random non-magnetic dilution of magnetic Fe3+ (HS) ions by Co3+ (LS) ions due to B-site disorder essentially played a crucial role in manifesting the magnetic properties of the system.

Keywords: Neutron Diffraction, X-ray absorption spectroscopy, X-ray magnetic circular dichroism, ab initio DFT calculations, Magnetization study

Suggested Citation

Pal, Arkadeb and Singh, Prajyoti and Kumar, Shiv and Gangwar, V.K. and Ghosh, Surajit and Saha, S. K. and Prakash, P. and Schwier, Eike F. and Sawada, M. and Shimada, K. and Das, Amitabh and Kumar, Manoranjan and Ghosh, A. K. and Chatterjee, Sandip, B-Site Disorder and Spin States Driven Multiple-Magnetic Phases: Griffiths Phase, Re-Entrant Cluster Glass and Exchange Bias in Pr 2CoFeO 6 (January 7, 2019). Available at SSRN: https://ssrn.com/abstract=3311601

Arkadeb Pal (Contact Author)

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU) ( email )

Varanasi
Varanasi, 221005
India

Prajyoti Singh

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

Varanasi
Varanasi, 221005
India

Shiv Kumar

Hiroshima University - Hiroshima Synchrotron Radiation Centre

Higashi-Hiroshima 739-0046
Japan

V.K. Gangwar

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

Varanasi
Varanasi, 221005
India

Surajit Ghosh

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

Varanasi
Varanasi, 221005
India

S. K. Saha

S.N. Bose National Centre for Basic Sciences

Sector - III, Block - JD
Salt Lake City, Kolkata 700098
India

P. Prakash

Bhaba Atomic Research Centre - Solid State Physics Division

Mumbai 400085
India

Eike F. Schwier

Hiroshima University - Hiroshima Synchrotron Radiation Centre

Higashi-Hiroshima 739-0046
Japan

M. Sawada

Hiroshima University - Hiroshima Synchrotron Radiation Centre

Higashi-Hiroshima 739-0046
Japan

K. Shimada

Hiroshima University - Hiroshima Synchrotron Radiation Centre

Higashi-Hiroshima 739-0046
Japan

Amitabh Das

Bhaba Atomic Research Centre - Solid State Physics Division

Mumbai 400085
India

Indira Gandhi Center for Atomic Research (IGCAR) - Homi Bhabha National Institute

Mumbai, MS
India

Manoranjan Kumar

S.N. Bose National Centre for Basic Sciences

Sector - III, Block - JD
Salt Lake City, Kolkata 700098
India

A. K. Ghosh

Banaras Hindu University (BHU)

Varanasi
Uttar Pradesh
Varanasi, Uttar Pradesh 221005
India

Sandip Chatterjee

Banaras Hindu University (BHU) - Indian Institute of Technology (IIT-BHU)

Varanasi
Varanasi, 221005
India

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