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Semináře

Anil Kumar: Polymorphism of thermoelectric TAGS-85
Begin: 27.02.2019, 14:10
Location: lecture room F2, first floor Ke Karlovu 5

Herwig Michor: Crystal growth and studies of CDW physics in quasi-1D metals RNiC2
Begin: 28.03.2019, 13:30
Location: lecture room F2, first floor Ke Karlovu 5

 
Title: Toshihiro Nomura: Magnetocaloric effect measurement in pulsed magnetic fields; applications to solid oxygen and frustrated magnets
Number: 5/19
Status: Closing date exceeded
Begin: Středa, Únor 13, 2019 at 02:10
Tutor: Vladimír Sechovský
Location: lecture room F2, first floor Ke Karlovu 5


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We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML) http://mgml.eu.

 

Program

 

Magnetocaloric effect measurement in pulsed magnetic fields; applications to solid oxygen and frustrated magnets

lecture given by:

Toshihiro Nomura

HLD-EMFL, Helmholtz-Zentrum Dresden-Rossendorf

The seminar takes place in the lecture room F2 
of the Faculty of Mathematics and Physics, Ke Karlovu 5, Praha 2
on Wednesday, 13.2. 2019 from 14:10 

Vladimír Sechovský
On behalf of the DCMP and MGML


Abstract 

When a material is magnetized or demagnetized under adiabatic conditions, its temperature changes to conserve the total entropy. This is called the magnetocaloric effect (MCE). In pulsed magnetic fields, the MCE is easily observed due to the short duration of time. Recently, the MCE measurement in pulsed magnetic fields was established and applied to various magnetic materials. The MCE measurement serves as an ideal technique to (i) reveal the magnetic-field-temperature phase diagram, (ii) obtain the entropy information, and (iii) discuss Grüneisen parameter which reflects the quantum criticality.

In this talk, I present some examples of the MCE researches in pulsed magnetic fields up to 60 T. The examples will include solid oxygen and frustrated magnets (Sr3Cr2O8, MnCr2S4, BaCo2V2O8).

[1] T. Kihara et al., Rev. Sci. Instrum. 84, 074901 (2013).

[2] T. Nomura et al., Phys. Rev. B 95, 104420 (2017).

[3] Z. Wang et al, Phys. Rev. Lett. 120, 207205 (2018).

b-g solidO2

FIG. Adiabatic temperature change of solid oxygen along the b-γ phase boundary.


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