Significant inverse magnetocaloric effect induced by quantum criticality

Dipolar Spin Liquid Ending with Quantum Critical Point in a Gd-based Triangular Magnet

“…3(b), we obtain a lowest T m 33 mK from initial T i 95 mK. Such unprecedented MCE response strongly corroborates the existence of QCP at B c 0.75 T, as is further substantiated by an evident peak-dip structure with sign change in the magnetic Grüneisen ratio Γ B = 1 T ( ∂T ∂B ) S [45][46][47][48], shown in Fig. 3 in-set, which has been widely used in characterizing QCP for heavy fermions [49][50][51][52][53] and low-dimensional quantum spin systems [54][55][56][57].…”

Chirality and Magnetocaloricity in GdFeTeO6 as Compared to GdGaTeO6

“…This makes GdFeTeO 6 attractive for the working body of low-temperature magnetic refrigerator devices. With the intensification of research at helium temperatures, the problem of cooling the current leads of superconducting solenoids and reaching ultralow temperatures becomes increasingly urgent [32][33][34][35][36][37].…”

K2RENb5O15 (RE = Ce, Pr, Nd, Sm, Gd–Ho): A Family of Quasi-One-Dimensional Spin-Chain Compounds with Large Interchain Distance

“…27,28 Usually, the lowest achievable temperature for magnetic cooling is related to the magnetic ordering temperature of materials; thus, the nearly noninteracting dilute paramagnetic (PM) salts, such as cerous magnesium nitrate (CMN) and ferric ammonium, are widely used in ADR as refrigerants. 29,30 In the case of the 1D spin-chain systems, the spin disorder or magnetic ordered state at suppressed temperatures makes them superior ADR coolants for achieving ultralow temperatures, 31,32 and the large residual magnetic entropy around the transition point can produce a sizable MC effect. Especially for the RE-based 1D materials, the combination of weak exchange interaction with diverse magnetic anisotropy and large cooling capacity makes them flexible for designing MC materials working at much lower temperatures and in different field regions; therefore, experimental MCE studies on RE SC materials are highly desirable to check whether they can exhibit excellent cooling performances on achieving sub-Kelvin temperatures.…”

“…From the viewpoint of application, low-dimensional RE-based magnets are attractive as promising magnetic refrigeration materials at low temperatures. Owing to the reduced magnetic transition temperature and highly fluctuating magnetic ground state induced by its low-dimensional nature, a large magnetocaloric (MC) effect (MCE) can be realized at low temperatures and used to obtain the sub-Kelvin (<1 K) temperatures during the adiabatic demagnetization (ADR) process. − The enhanced MCE at sub-Kelvin made them attractive magnetic coolants for developing helium-free refrigeration with important applications in space applications under microgravity conditions and quantum computing. , Usually, the lowest achievable temperature for magnetic cooling is related to the magnetic ordering temperature of materials; thus, the nearly noninteracting dilute paramagnetic (PM) salts, such as cerous magnesium nitrate (CMN) and ferric ammonium, are widely used in ADR as refrigerants. , In the case of the 1D spin-chain systems, the spin disorder or magnetic ordered state at suppressed temperatures makes them superior ADR coolants for achieving ultralow temperatures, , and the large residual magnetic entropy around the transition point can produce a sizable MC effect. Especially for the RE-based 1D materials, the combination of weak exchange interaction with diverse magnetic anisotropy and large cooling capacity makes them flexible for designing MC materials working at much lower temperatures and in different field regions; therefore, experimental MCE studies on RE SC materials are highly desirable to check whether they can exhibit excellent cooling performances on achieving sub-Kelvin temperatures.…”