Structural, magnetic, electric, dielectric, and thermodynamic properties of multiferroic Ge V4 S8

Widmann S.; Gunther A.; Ruff E.; Tsurkan Vladimir; Krug Von Nidda Hans Albrecht; Lunkenheimer Peter; Loidl Alois

Conţinutul numărului revistei

Articolul precedent

Articolul urmator

682

SM ISO690:2012

WIDMANN, S., GUNTHER, A., RUFF, E., TSURKAN, Vladimir, KRUG VON NIDDA, Hans Albrecht, LUNKENHEIMER, Peter, LOIDL, Alois. Structural, magnetic, electric, dielectric, and thermodynamic properties of multiferroic Ge V4 S8. In: Physical Review B, 2016, vol. 94, pp. 10-20. ISSN 2469-9950. DOI: https://doi.org/10.1103/PhysRevB.94.214421

EXPORT metadate:
Google Scholar
Crossref
CERIF

DataCite
Dublin Core

Physical Review B

Volumul 94 / 2016 / ISSN 2469-9950 /ISSNe 2469-9969

Structural, magnetic, electric, dielectric, and thermodynamic properties of multiferroic Ge V4 S8

DOI:https://doi.org/10.1103/PhysRevB.94.214421

Pag. 10-20

Widmann S.¹, Gunther A.¹, Ruff E.¹, Tsurkan Vladimir¹², Krug Von Nidda Hans Albrecht¹, Lunkenheimer Peter¹, Loidl Alois¹

¹ University of Augsburg,
² Institute of Applied Physics, Academy of Sciences of Moldova

Disponibil în IBN: 19 octombrie 2017

Vezi articolul

Rezumat

The lacunar spinel GeV4S8 undergoes orbital and ferroelectric ordering at the Jahn-Teller transition around 30 K and exhibits antiferromagnetic order below about 14 K. In addition to this orbitally driven ferroelectricity, lacunar spinels are an interesting material class, as the vanadium ions form V4 clusters representing stable molecular entities with a common electron distribution and a well-defined level scheme of molecular states resulting in a unique spin state per V4 molecule. Here we report detailed x-ray, magnetic susceptibility, electrical resistivity, heat capacity, thermal expansion, and dielectric results to characterize the structural, electric, dielectric, magnetic, and thermodynamic properties of this interesting material, which also exhibits strong electronic correlations. From the magnetic susceptibility, we determine a negative Curie-Weiss temperature, indicative for antiferromagnetic exchange and a paramagnetic moment close to a spin S=1 of the V4 molecular clusters. The low-temperature heat capacity provides experimental evidence for gapped magnon excitations. From the entropy release, we conclude about strong correlations between magnetic order and lattice distortions. In addition, the observed anomalies at the phase transitions also indicate strong coupling between structural and electronic degrees of freedom. Utilizing dielectric spectroscopy, we find the onset of significant dispersion effects at the polar Jahn-Teller transition. The dispersion becomes fully suppressed again with the onset of spin order. In addition, the temperature dependencies of dielectric constant and specific heat possibly indicate a sequential appearance of orbital and polar order.

Cuvinte-cheie
Mott Insulators, Ferroelectricity, multiferroics

Crossref XML Export

<?xml version='1.0' encoding='utf-8'?>
<doi_batch version='4.3.7' xmlns='http://www.crossref.org/schema/4.3.7' xmlns:xsi='http://www.w3.org/2001/XMLSchema-instance' xsi:schemaLocation='http://www.crossref.org/schema/4.3.7 http://www.crossref.org/schema/deposit/crossref4.3.7.xsd'>
<head>
<doi_batch_id>ibn-55213</doi_batch_id>
<timestamp>1713506231</timestamp>
<depositor>
<depositor_name>Information Society Development Instiute, Republic of Moldova</depositor_name>
<email_address>idsi@asm.md</email_address>
</depositor>
</head>
<body>
<journal>
<journal_metadata>
<full_title>Physical Review B</full_title>
<issn media_type='print'>24699950</issn>
</journal_metadata>
<journal_issue>
<publication_date media_type='print'>
<year>2016</year>
</publication_date>
<issue></issue>
</journal_issue>
<journal_article publication_type='full_text'><titles>
<title>Structural, magnetic, electric, dielectric, and thermodynamic properties of multiferroic Ge V4 S8</title>
</titles>
<contributors>
<person_name sequence='first' contributor_role='author'>
<given_name>Sebastian</given_name>
<surname>Widmann</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Axel</given_name>
<surname>Günther</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Eugen</given_name>
<surname>Ruff</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Vladimir</given_name>
<surname>Ţurcan</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Hans Albrecht</given_name>
<surname>Krug Von Nidda</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Peter</given_name>
<surname>Lunkenheimer</surname>
</person_name>
<person_name sequence='additional' contributor_role='author'>
<given_name>Alois</given_name>
<surname>Loidl</surname>
</person_name>
</contributors>
<publication_date media_type='print'>
<year>2016</year>
</publication_date>
<pages>
<first_page>10</first_page>
<last_page>20</last_page>
</pages>
<doi_data>
<doi>10.1103/PhysRevB.94.214421</doi>
<resource>http://www.crossref.org/</resource>
</doi_data>
</journal_article>
</journal>
</body>
</doi_batch>