Thermal transport of the frustrated spin-chain mineral linarite: Magnetic heat transport and strong spin-phonon scattering

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11320%2F21%3A10437829" target="_blank" >RIV/00216208:11320/21:10437829 - isvavai.cz</a>

Výsledek na webu

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=L8b8XnJrJP" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=L8b8XnJrJP</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1103/PhysRevB.104.235129" target="_blank" >10.1103/PhysRevB.104.235129</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Thermal transport of the frustrated spin-chain mineral linarite: Magnetic heat transport and strong spin-phonon scattering

Popis výsledku v původním jazyce

The mineral linarite [PbCuSO4(OH)2] forms a monoclinic structure where a sequence of Cu(OH)2 units forms a spin-12 chain. Competing ferromagnetic nearest-neighbor (J1) and antiferromagnetic next-nearest-neighbor interactions (J2) in this quasi-one-dimensional spin structure imply magnetic frustration and lead to magnetic ordering below TN=2.8K in a multiferroic elliptical spin-spiral ground state. Upon the application of a magnetic field along the spin-chain direction, distinct magnetically ordered phases can be induced. We studied the thermal conductivity κ in this material across the magnetic phase diagram as well as in the paramagnetic regime in the temperature ranges 0.07-1 K and 9-300 K. We found that in linarite the heat is carried mainly by phonons but shows a peculiar nonmonotonic behavior in field. In particular, κ is highly suppressed at the magnetic phase boundaries, indicative of strong scattering of the phonons off critical magnetic fluctuations. Even at temperatures far above the magnetically ordered phases, the phononic thermal conductivity is reduced due to scattering off magnetic fluctuations. The mean free path due to spin-phonon scattering (lspin-phonon) was determined as a function of temperature. A power law behavior was observed mainly above 500mK indicating the thermal activation of spin fluctuations. In the critical regime close to the saturation field, lspin-phonon shows a 1/T dependence. Furthermore, a magnon thermal transport channel was verified in the helical magnetic phase. We estimate a magnon mean free path which corresponds to about 1000 lattice spacings. (C)2021 American Physical Society

Název v anglickém jazyce

Thermal transport of the frustrated spin-chain mineral linarite: Magnetic heat transport and strong spin-phonon scattering

Popis výsledku anglicky

The mineral linarite [PbCuSO4(OH)2] forms a monoclinic structure where a sequence of Cu(OH)2 units forms a spin-12 chain. Competing ferromagnetic nearest-neighbor (J1) and antiferromagnetic next-nearest-neighbor interactions (J2) in this quasi-one-dimensional spin structure imply magnetic frustration and lead to magnetic ordering below TN=2.8K in a multiferroic elliptical spin-spiral ground state. Upon the application of a magnetic field along the spin-chain direction, distinct magnetically ordered phases can be induced. We studied the thermal conductivity κ in this material across the magnetic phase diagram as well as in the paramagnetic regime in the temperature ranges 0.07-1 K and 9-300 K. We found that in linarite the heat is carried mainly by phonons but shows a peculiar nonmonotonic behavior in field. In particular, κ is highly suppressed at the magnetic phase boundaries, indicative of strong scattering of the phonons off critical magnetic fluctuations. Even at temperatures far above the magnetically ordered phases, the phononic thermal conductivity is reduced due to scattering off magnetic fluctuations. The mean free path due to spin-phonon scattering (lspin-phonon) was determined as a function of temperature. A power law behavior was observed mainly above 500mK indicating the thermal activation of spin fluctuations. In the critical regime close to the saturation field, lspin-phonon shows a 1/T dependence. Furthermore, a magnon thermal transport channel was verified in the helical magnetic phase. We estimate a magnon mean free path which corresponds to about 1000 lattice spacings. (C)2021 American Physical Society

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

2021

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

—

Svazek periodika

104

Číslo periodika v rámci svazku

23

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

10

Strana od-do

235129

Kód UT WoS článku

000753729500005

EID výsledku v databázi Scopus

2-s2.0-85122064034