Quantum versus classical nature of the low-temperature magnetic phase transition in TbAl3(BO3)4

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F22%3A00563775" target="_blank" >RIV/68378271:_____/22:00563775 - isvavai.cz</a>

Výsledek na webu

<a href="https://doi.org/10.1103/PhysRevB.105.094418" target="_blank" >https://doi.org/10.1103/PhysRevB.105.094418</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.105.094418" target="_blank" >10.1103/PhysRevB.105.094418</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Quantum versus classical nature of the low-temperature magnetic phase transition in TbAl3(BO3)4

Popis výsledku v původním jazyce

Specific heat C-B of a TbAl3(BO3)(4) crystal was studied for 50 mK < T < 300 K with emphasis on T < 1 K where a phase transition was found at T-c = 0.68 K. Nuclear, nonphonon (C-m), and lattice contributions to C-B were separated. Lowering of T-c with an increase in magnetic field parallel to the easy magnetization axis (B-parallel to) was found. It was established that C-m and a Gruneisen ratio depend on B-parallel to and T in a way characteristic of systems in which a classical transition is driven by quantum fluctuations (QFs) to a quantum critical point at T = 0 by tuning a control parameter (B-parallel to). The B-parallel to T phase diagram was constructed, and the dynamical critical exponent 0.82 <= z <= 0.96 was assessed. Nature of the transition was not established explicitly. Magnetization studies point at the ferromagnetic ordering of Tb3+ magnetic moments, however, lowering of T-c with increase in B-parallel to is opposite to the classical behavior. Hence, a dominant role of QFs was supposed.

Název v anglickém jazyce

Quantum versus classical nature of the low-temperature magnetic phase transition in TbAl3(BO3)4

Popis výsledku anglicky

Specific heat C-B of a TbAl3(BO3)(4) crystal was studied for 50 mK < T < 300 K with emphasis on T < 1 K where a phase transition was found at T-c = 0.68 K. Nuclear, nonphonon (C-m), and lattice contributions to C-B were separated. Lowering of T-c with an increase in magnetic field parallel to the easy magnetization axis (B-parallel to) was found. It was established that C-m and a Gruneisen ratio depend on B-parallel to and T in a way characteristic of systems in which a classical transition is driven by quantum fluctuations (QFs) to a quantum critical point at T = 0 by tuning a control parameter (B-parallel to). The B-parallel to T phase diagram was constructed, and the dynamical critical exponent 0.82 <= z <= 0.96 was assessed. Nature of the transition was not established explicitly. Magnetization studies point at the ferromagnetic ordering of Tb3+ magnetic moments, however, lowering of T-c with increase in B-parallel to is opposite to the classical behavior. Hence, a dominant role of QFs was supposed.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

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

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

Physical Review B

ISSN

2469-9950

e-ISSN

2469-9969

Svazek periodika

105

Číslo periodika v rámci svazku

9

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

7

Strana od-do

094418

Kód UT WoS článku

000771570100002

EID výsledku v databázi Scopus

2-s2.0-85126954433