Specific heat study of the magnetocaloric effect in the Haldane-gap S=1 spin-chain material [Ni(C2H8N2)(2)NO2](BF4)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F17%3A10363643" target="_blank" >RIV/00216208:11320/17:10363643 - isvavai.cz</a>

Result on the web

<a href="http://dx.doi.org/10.1103/PhysRevB.96.094425" target="_blank" >http://dx.doi.org/10.1103/PhysRevB.96.094425</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.96.094425" target="_blank" >10.1103/PhysRevB.96.094425</a>

Result language

angličtina

Original language name

Specific heat study of the magnetocaloric effect in the Haldane-gap S=1 spin-chain material [Ni(C2H8N2)(2)NO2](BF4)

Original language description

Magnetocaloric effect in the Haldane-gap S = 1 spin-chain [Ni(C2H8N2)(2)NO2](BF4) was investigated at low temperatures (k(B)T &lt;&lt; J) and magnetic fields up to nominally 0.1B(sat), where J and B-sat denote an exchange interaction and saturation magnetic field, respectively. Magnetic entropy was found to scale as exp(Delta/k(B)T) in zero magnetic field and T-0.67 for B = B-c, in which the Haldane gap should be closed, in reasonable agreement with the theoretical predictions. The existence of the inverse magnetocaloric effect for B &lt; B-c was confirmed. The occurrence of normal magnetocaloric response at lowest temperatures and magnetic fields was attributed to S = 1/2 degrees of freedom arising from the ends of chain segments.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10302 - Condensed matter physics (including formerly solid state physics, supercond.)

Project

<a href="/en/project/LM2011025" target="_blank" >LM2011025: MLTL - Magnetism and Low Temperature Laboratories - operation and development of national research infrastructure</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2017

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Physical Review B

ISSN

2469-9950

e-ISSN

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Volume of the periodical

96

Issue of the periodical within the volume

9

Country of publishing house

US - UNITED STATES

Number of pages

7

Pages from-to

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UT code for WoS article

000411291700005

EID of the result in the Scopus database

2-s2.0-85029946746